Answers to Selected Exercises

Worked solutions to the daggered (†) and odd-numbered exercises from each chapter. Try every problem before reading its solution.

Chapter 1

Exercise 1.1

The four numbers are the charge, the allowed amount, the contractual adjustment, and the payment (which splits into patient responsibility and plan payment).

Charge − Allowed amount = Contractual adjustment. Allowed amount − Patient responsibility = Plan payment.

Exercise 1.3

An encounter is one instance of clinical care — a visit, an admission, a procedure. A claim is one request for payment submitted to a payer. An account is the financial record where the money lives.

One encounter, two claims, one account: a hospital emergency department visit produces a facility claim on a UB-04 from the hospital and a professional claim on a CMS-1500 from the emergency physician's group. Both describe the same visit. In many systems they sit on two account numbers under one guarantor, which is why patients receive two statements and believe they have been billed twice.

Exercise 1.4 †

\$46.40. Coinsurance is a percentage of the allowed amount, never of the charge.

• 20% × \$232.00 = \$46.40 (correct)
• 20% × \$400.00 = \$80.00 (wrong)

Why it matters: the error overcollects by \$33.60 on this single line. Systematically applied, it creates credit balances the practice is legally obligated to refund, and a knowingly retained overpayment is a compliance exposure, not a bookkeeping backlog (Ch. 31 §31.9). The reverse error — collecting nothing at the desk — converts a payment the patient was ready to make into a receivable that ages and is collected at a discount, if at all.

Exercise 1.5

Exercise 1.7 †

Definition without the word "clean": a claim that contains every required data element, is internally consistent, passes the payer's front-end and adjudication edits, and can therefore be processed to a payment decision without the payer needing anything further from the provider.

Three reasons an accurate claim might not qualify: 1. A demographic or coverage defect — invalid subscriber ID, wrong plan, coverage terminated on the date of service. The codes are perfect; the claim is unprocessable. 2. A missing required attachment or authorization number — the service was authorized, but the number is not on the claim, so the payer cannot match it. 3. A missing or invalid identifier — no rendering provider NPI, a taxonomy code the payer requires and did not receive, or a CLIA number absent on a laboratory claim.

None of the three is a coding error, which is the point of the exercise.

Exercise 1.9 †

Check 1: 375.00 − 216.35 = 158.65 ✓ Check 2: 216.35 − 43.27 = 173.08 ✓

(Line C's coinsurance is 20% × 6.75 = 1.35 exactly. Where a line produces a fraction of a cent, round at the line and let the total follow; do not round the total independently, or your checks will fail by a penny and you will spend twenty minutes finding it.)

Exercise 1.11 †

• Contractual adjustment: \$5,120.00 − \$1,438.00 = \$3,682.00
• Allowed after copay: \$1,438.00 − \$400.00 = \$1,038.00
• Coinsurance: \$1,038.00 × 0.20 = **\$207.60**
• Patient responsibility: \$400.00 + \$207.60 = \$607.60
• Plan payment: \$1,438.00 − \$607.60 = \$830.40

Check 1: 5,120.00 − 1,438.00 = 3,682.00 ✓ Check 2: 1,438.00 − 607.60 = 830.40 ✓

Note that the patient owes \$607.60 on \$5,120.00 in charges — 11.9% — and 42.3% of the allowed amount. The second figure is the meaningful one.

Exercise 1.13

• Deductible applied: \$120.00
• Remaining allowed after deductible: \$186.40 − \$120.00 = \$66.40
• Coinsurance: \$66.40 × 0.20 = \$13.28
• Patient responsibility: \$120.00 + \$13.28 = \$133.28
• Plan payment: \$186.40 − \$133.28 = \$53.12

Check: 133.28 + 53.12 = 186.40 ✓

The lesson: early in a plan year, the plan may pay very little on a claim that is fully covered. Nothing is wrong. Patients frequently interpret this as a denial.

Exercise 1.14 †

• Denied claims per month: 1,400 × 0.11 = 154
• Allowed value denied: 154 × \$118.00 = **\$18,172.00**
• Recovered after rework (55%): \$18,172.00 × 0.55 = **\$9,994.60**
• Written off: \$18,172.00 − \$9,994.60 = \$8,177.40

At a 6% denial rate: 1,400 × 0.06 = 84 denials, so 70 fewer denials per month for staff to touch — 840 a year.

The interpretation, which is the actual point: the recovered dollars barely move, because the same recovery percentage applies to a smaller base. What changes is the write-off (down to about \$4,459) and — more importantly — 840 accounts a year that nobody has to open, classify, research, correct, resubmit, or appeal. The return on prevention is mostly labor, not revenue.

Exercise 1.15 †

(a) Allowed amount = charges − insurance adjustments = \$1,940.00 − \$1,082.60 = \$857.40.

(b) Yes. \$857.40 − \$612.40 (insurance payment) = \$245.00 balance ✓

(c) No. The statement shows only that \$245.00 of the allowed amount was assigned to the patient. It does not say why. You would need the remittance advice or explanation of benefits, which carries the group code and claim adjustment reason code: PR-1 is deductible, PR-2 is coinsurance, PR-3 is copayment. A patient statement almost never distinguishes them, which is a large part of why patients call.

Exercise 1.17 †

Model answer: "That line is for supplies used during your visit. Under our contract with your plan, payment for supplies is included in the payment for the visit itself — so the plan doesn't pay a separate amount for them, and you don't owe anything for them either. It shows on the itemized list because the itemized list records everything that was used. Nothing on that line is your responsibility."

The technical name is packaging, and it is covered in Chapter 34 §34.5. The key teaching point is that "allowed \$0.00" is not the same as "denied," and a patient reading the statement has no way to know the difference.

Exercise 1.19 †

Three specific costs: 1. Terminated coverage. The patient changed jobs; the policy ended on the last day of the prior month. The claim denies as no coverage, and the balance moves to the patient thirty to sixty days later, when they are far less likely to pay it. 2. A changed plan under the same insurer. Same card, same carrier, different product with a different network, different copay, and possibly a different claims address. The claim goes to the wrong payer or the wrong product and denies. 3. New secondary coverage or a change in the coordination-of-benefits order. The claim goes to the wrong payer first and denies for COB.

Most likely: the second. A patient whose employer changed plans at renewal is typically unaware anything changed, hands over a card that looks identical to last year's, and answers "no" honestly when asked whether anything is different. Only the eligibility transaction catches it.

Exercise 1.21

For re-sorting: value is destroyed by deadline expiry, not by age. A \$1,200 denial with sixty days remaining is safe; a \$140 denial with three days is not. An age-sorted queue guarantees that some collectible accounts will be written off for timely filing, which is the most avoidable loss category in the cycle.

What you lose: age-sorted queues naturally surface the oldest and often largest balances first, and they make the aging report legible to management. A deadline-sorted queue therefore needs a secondary sort by dollar value within each deadline band, and a separate report for anything aging past a threshold regardless of deadline.

Exercise 1.22 †

1. Stop the bleeding first. Find out whether the defect that caused the rejections is still active. If it is a bad payer identifier or a submitter setup problem, claims are still rejecting today.
2. Establish the full scope. Forty-one is what was found. Pull the complete acknowledgment history and determine the actual date range and count.
3. Check the timely filing status of every one, individually, against that payer's contract, and triage: correct and resubmit the ones with room, and prepare a timely-filing appeal package with proof of the original submission attempt for any that have expired. Clearinghouse acknowledgment reports are the evidence — preserve them.
4. Correct and resubmit, in deadline order.
5. The step people forget: put a daily control in place so it cannot recur — someone opens the acknowledgment report every business day, and the count of claims submitted must reconcile to the count acknowledged. A process that depends on someone noticing is not a control.

Exercise 1.25 †

**B — \$60.00.** Patient responsibility is 20% of the *allowed amount* of \$300.00. Answer A (\$100.00) is 20% of the charge. Answer C is the contractual adjustment. Answer D adds the adjustment to the coinsurance, which is the balance-billing error.

Exercise 1.27 †

B — a rejection. It never reached adjudication, so there is no decision to appeal. It must be corrected and resubmitted, and the timely filing clock never stopped.

Exercise 1.29 †

B — the allowed amount.

Exercise 1.31 †

Model answer (114 words):

Understanding your statement. The "charges" column lists everything that was done, priced at our standard rate. Your health plan and this practice have an agreement setting what each service is worth; that agreed figure is the allowed amount. The difference between our charge and the allowed amount is removed from your account entirely — you do not owe it and neither does your plan. What remains is divided between your plan and you, according to your benefit: your deductible, your copay, and your coinsurance percentage, all calculated on the allowed amount and never on the charge. The "balance due" line is your share. If it does not match your plan's explanation of benefits, call us.

Exercise 1.34 †

Expected: a charge, an allowed amount, a contractual adjustment, and a payment split between plan and patient.

Estimable now: the charge. Chapter 1 states the four claim lines total \$367.00.

Not estimable: the allowed amount depends on the Northfield Mutual contract, which has not been shown. The contractual adjustment is arithmetic on the allowed amount, so it follows. And patient responsibility depends on both the allowed amount and the benefit design — which is known (deductible met, \$30 copay, 20% coinsurance) but cannot be applied to an unknown allowed amount.

The exercise's real point: three of the four numbers are unknowable until you know the contract, and the contract is Chapter 2.

Exercise 1.36 †

Days the practice could have shortened, from the timeline in §1.3:

• Day 0 → 1 (coding lag): one day is good. Charge lag is measured in most organizations and a one-day lag is not the problem here.
• Day 1 → 2 (claim build and scrub): one day. Reasonable.
• Day 17 → 20 (denial sat three days): recoverable — up to 3 days. The remit posted Friday; the denial was worked Monday. That is a weekend, not negligence, but a same-day denial triage process would have started the appeal on day 17.
• Day 20 → 24 (records assembly, 4 days): recoverable — up to 3 days. Pulling one office note and writing one letter does not take four days; it waited in a queue.
• Day 66 → 70 (statement lag, 4 days): recoverable — up to 3 days, depending on the statement cycle. Many practices run statements weekly, which builds in this delay by design.
• Day 70 → 100 (patient payment, 30 days): partly addressable through statement design, an accurate pre-service estimate, and offering payment at the time of service — but not a process delay.

Total recoverable: roughly 9 days of the 100, all of it internal, none of it in the two long stretches where the claim was with the payer. The honest conclusion — and it is the chapter's argument — is that you cannot speed this file up meaningfully once the denial exists. The only large lever is preventing the denial, which would have removed 49 days at a stroke.

Exercise 1.39 †

• Contractual adjustment: \$367.00 − \$216.28 = \$150.72
• As a percentage of charge: \$150.72 ÷ \$367.00 = 41.1%

The emergency department example: \$2,645.60 ÷ \$3,842.00 = 68.9% on the facility claim.

Accounting for the difference: hospital chargemaster rates are typically set at a far higher multiple of the expected allowed amount than a physician practice's fee schedule is, for reasons Chapter 23 §23.7–23.8 develops — including that a hospital serves payers whose contracts are percentage-of-charges, and that chargemaster maintenance across tens of thousands of line items lags reality. A physician practice with a few hundred codes tends to set charges at a much tighter multiple. Neither percentage tells you anything about whether either organization was paid appropriately; that is the whole trap of the gross collection rate, and Chapter 23 §23.10 says so.

Chapter 2

Exercise 2.1

Premium — the recurring price of coverage. Never paid to a provider. Deductible — the amount the patient pays for covered services before the plan pays; paid to the provider. Copayment — a flat amount per service type; paid to the provider. Coinsurance — a percentage of the allowed amount; paid to the provider. Out-of-pocket maximum — a ceiling, not a payment; it is never paid to anyone, it only stops further patient liability.

Exercise 2.3 †

Participation means the provider has signed a network contract with an agreed fee schedule — a pricing question. Assignment means the provider accepts payment directly from the payer rather than having the payer send it to the patient — a routing question.

A situation where they differ: a provider who is out of network with a commercial plan may still accept assignment of benefits, so the plan pays the provider directly rather than mailing a check to the patient. There is no contracted allowed amount, the patient's cost share is at the out-of-network tier, and (absent a protection like the No Surprises Act) the balance may be billable — but the payment routing is direct. In Medicare, the two concepts are tightly linked and carry statutory meanings, including the limiting charge; see Chapter 3 §3.4.

Exercise 2.5

A third-party administrator administers a health plan — network, claims processing, member services — without bearing claims risk. The employer bears the risk and chose the benefit design.

Two patients with cards from the same insurer can therefore have materially different coverage because their employers bought different plans. The insurer's logo indicates who processes the claim, not who wrote the rules.

Exercise 2.6 †

Exercise 2.9

A work-related injury is excluded from health plan benefits and is covered by the employer's workers' compensation carrier. Health plans exclude it by contract; billing one for a work injury produces a denial and, at volume, looks like something worse.

Before the health plan becomes the payer, a written workers' compensation denial must exist — the carrier must have determined the injury is not compensable. Until then the health plan will (correctly) deny.

Exercise 2.11 †

Case (d) is the one to study: the arithmetic produces \$351.00, but the out-of-pocket maximum has only \$250.00 remaining, so the ceiling binds after the calculation and the plan absorbs the difference.

Exercise 2.13 †

Charge \$240.00:

Charge raised to \$310.00:

What changed: only the contractual adjustment, in two of three cases. Under (c), and only (c), the payment rose. (122% × 129.60 = 158.112 → \$158.11.)

Exercise 2.15 †

Aggregate design, \$5,000 family deductible with \$4,300 met (\$700 remaining): - Deductible: \$700.00 - Remainder: \$1,900.00 − \$700.00 = \$1,200.00; coinsurance 20% = \$240.00 - Patient \$940.00 · Plan \$960.00 · Check: 940 + 960 = 1,900 ✓

Embedded design, this member's \$2,500 individual deductible fully met: - No deductible applies to this member. Coinsurance 20% × \$1,900.00 = \$380.00 - Patient \$380.00 · Plan \$1,520.00 · Check: 380 + 1,520 = 1,900 ✓

Difference: \$560.00 on one claim, from a design distinction that is not printed on the card. This is why §2.2 says read the accumulator response, never the card.

Exercise 2.17 †

(a) The plan is a VALUE HMO and specialist visits require a referral. Without one on file, the claim will deny for lack of referral, and in most HMO designs the patient cannot be billed for a service denied because the provider failed to confirm the referral requirement — the contract typically places that obligation on the participating provider. The correct action is not to see the patient and bill anyway; it is to obtain the referral before the visit or reschedule.

(b) Deductible is met. Specialist copay \$65.00 applies to the office visit. The injection is "all other" — but note the response only itemizes outpatient surgery at 30%; it does not state a coinsurance for an office-based injection. **This is the trap in the exercise.** You cannot compute it from this response. You would call the payer or check the plan document. If the injection falls under a 30% coinsurance, the patient owes \$65.00 + (30% × \$74.00 = \$22.20) = \$87.20 — but that is an assumption, and it should be labeled as one rather than quoted to a patient.

(c) You cannot determine: any allowed amount; whether an injection requires authorization; whether the patient has other coverage; the coinsurance for service categories not listed.

Exercise 2.19 †

Sequence: (1) Confirm the denial is genuinely COB and not a mis-keyed subscriber ID. (2) Check the account for any secondary coverage already on file. (3) If the payer believes other coverage exists and you have no record of it, contact the patient, not the payer. (4) Ask the patient to call their plan's member services and update the coordination-of-benefits record — the payer will generally not accept the provider's word for it. (5) Document the call, set a follow-up, and refile once the payer's COB record is updated.

Whose problem it is: the member's. The payer suspends claims because its COB questionnaire was not returned, and only the member can resolve that.

What not to do: spend hours arguing with payer provider services. They cannot update a member's COB record from a provider call, and a biller who does not know this can lose weeks on it.

Exercise 2.21 †

The answer is no. Routinely waiving a Medicare beneficiary's cost sharing implicates the Anti-Kickback Statute (42 U.S.C. § 1320a-7b(b)) — the waiver can be characterized as remuneration to induce the beneficiary to obtain services — and it can constitute a false statement about the provider's actual charge, since the "charge" is now effectively lower than what is being represented. It also typically breaches the Medicare participation agreement's requirement to collect applicable cost sharing.

The compliant alternative: an individualized, documented financial hardship determination, made under a written policy applied uniformly, based on the patient's actual circumstances rather than on longevity as a customer. The line the OIG has drawn repeatedly is between a case-by-case documented hardship finding (defensible) and a routine or advertised waiver (not).

What to say to the owner: the request is generous and the answer has to be no in this form, but there is a legitimate path, and if the patient genuinely cannot afford the copay we should assess that properly and document it — which protects her and the practice.

Exercise 2.23 †

Financial consequence: an EPO generally has no out-of-network benefit except for emergencies. This is not "more expensive" — it is not covered. The patient would owe the surgeon's entire billed charge, with no contracted allowed amount, no contractual adjustment, and nothing counting toward their deductible or out-of-pocket maximum.

What to do without misrepresenting anything: state that plainly and early. Then help: confirm the network status directly with the plan rather than relying on a directory; ask whether the plan has a process for an out-of-network exception or gap exception where no in-network provider has the needed expertise (many do, and patients rarely know it exists); and offer to identify in-network surgeons with the relevant experience. Do not promise an exception will be granted, and do not tell the patient "it'll just cost a bit more."

Exercise 2.26 †

Most to least:

1. (b) whether the deductible is met. §2.2 demonstrated this producing a swing from \$80.00 to \$400.00 on the same allowed amount — the largest single lever.
2. (a) the coinsurance percentage. Real and proportional, but bounded: the difference between 20% and 30% on a \$400 allowed amount is \$40.
3. (d) whether the plan is self-funded. It usually changes nothing about the arithmetic, but it can change what benefits exist at all and which appeal rights apply — occasionally decisive, usually not.
4. (c) plan type. Predicts access rules, not cost. An HMO and a PPO with identical benefit designs produce identical patient responsibility. Plan type matters enormously for whether the claim is payable and almost not at all for how much.

The ordering is the point: newcomers rank (c) first because it is the most visible thing on the card.

Exercise 2.27 †

A — the mother's. February precedes July. The birth years (1990 and 1984) are the distractor; the rule uses month and day only.

Exercise 2.29 †

**B — \$125.00.** 25% of the **allowed** amount of \$500.00. Answer A is 25% of the charge. Answer C is the contractual adjustment. Answer D adds the adjustment to the coinsurance, which is the balance-billing error.

Exercise 2.31 †

B — workers' compensation.

Exercise 2.33 †

Model answer (52 words):

"Your copay covered today's office visit. The injection and the lab work go through your insurance separately, and those are subject to your coinsurance — so you'll likely see a small additional balance, probably under twenty dollars. Would you like to take care of that now, or would you rather wait for the statement?"

It sets the expectation, gives a range rather than a figure the practice cannot stand behind, and offers a choice rather than a demand.

Exercise 2.35

Model answer: "Your plan has a deductible, which means you pay the plan's discounted rate for services until you've spent a set amount for the year — and then the plan starts paying its share. You're still getting the benefit of the discounted rate right now; it's just that the plan's payment kicks in later."

Exercise 2.36 †

Check 1: 367.00 − 216.28 = 150.72 ✓ Check 2: 216.28 − 47.58 = 168.70 ✓

The rounding line is J1030. 20% × \$6.28 = \$1.256. Rounded at the line: \$1.26. Aggregate: 20% × (78.60 + 6.28 + 3.00) = 20% × 87.88 = \$17.576 → \$17.58, and the per-line sum is 15.72 + 1.26 + 0.60 = \$17.58. They agree here by coincidence — the single half-cent rounded up in both approaches. With two or three such lines rounding in different directions they would diverge by a cent or two, which is why the rule is to round at the line, in the payer's order, and reconcile to the remit.

Exercise 2.38 †

Deductible remaining \$900.00, applied in claim line order until exhausted. Allowed total is \$216.28 — less than the remaining deductible, so the entire allowed amount falls within it.

The patient owes \$216.28. The plan pays \$0.00. The contractual adjustment is unchanged at \$150.72 — it is a function of the contract, not of the benefit, and nothing about the patient's deductible position touches it.

Two further points. The copay may or may not apply before the deductible depending on plan design; many plans waive the copay when the deductible applies, and some collect both. Check the plan document. And the patient's remaining deductible after this claim would be \$900.00 − \$216.28 = \$683.72.

Exercise 2.39

Category 1 — coverage and benefit reasons: the service is not a benefit, a frequency limit was exceeded, an authorization was required and absent, or the patient was not eligible on the date of service.

Category 2 — payment edits: the payer's own rules about which codes may be paid together, in what quantity, and under what circumstances — bundling edits, unit limits, and modifier requirements.

Category 2 is not a coding error. The codes can be entirely correct and the edit still fires, because the edit is a statement about the payer's payment logic rather than about the accuracy of the coding. That distinction is Chapter 21 and Chapter 29, and it is exactly what happens to this claim.

Chapter 3

Exercise 3.1

Pricing — the Medicare Physician Fee Schedule and its relative value methodology, which most commercial professional contracts are written as a percentage of. Edits — the National Correct Coding Initiative and Medically Unlikely Edits, published free and quarterly and adopted by most commercial payers. Coverage structure — NCDs and LCDs, published and citable, and imitated by commercial medical policy. Compliance and audit — the contractor structure, extrapolation methodology, and documentation standards, which commercial special investigations units model.

Exercise 3.3 †

A benefit period begins on inpatient admission and ends after the beneficiary has been out of a hospital or skilled nursing facility for 60 consecutive days. The Part A deductible applies once per benefit period.

A beneficiary can owe more than one Part A deductible in a calendar year. What determines it is the gap between stays, not the number of admissions: two admissions separated by more than 60 days out of an inpatient setting fall in two benefit periods and carry two deductibles. Two admissions 30 days apart fall in one benefit period and carry one. This is the most-tested fact about Part A and the reason "once per year" is the standard wrong answer.

Exercise 3.5

Does: processes and pays claims; publishes local coverage determinations and billing and coding articles; enrolls providers; conducts medical review including prepayment review and Targeted Probe and Educate; decides the first level of appeal (redetermination); publishes bulletins and provider education.

Does not: set national policy or decide national coverage; override or contradict a national coverage determination.

Exercise 3.6 †

Exercise 3.7

An NCD is a nationwide CMS decision, binding on all MACs. An LCD is one MAC's determination for its jurisdiction only, used where there is no NCD or to fill in details an NCD leaves open.

The billing and coding article — the LCD's companion document — usually carries the list of covered ICD-10-CM codes. Reading the LCD and stopping is the most common way to miss the thing you actually needed.

Exercise 3.9

The plan adjudicates instead of the MAC; there is a network; referrals are often required; prior authorization is common and a major denial source; cost sharing follows the plan's design and includes an out-of-pocket maximum that Original Medicare lacks; appeals begin with the plan; and the patient carries the plan's card rather than (or in addition to) the Medicare card.

Exercise 3.10 †

20 employees — attaches to age-65 entitlement with active employment. If the employer has 20 or more employees and the beneficiary is actively working, the group health plan is primary.

100 employees — attaches to disability entitlement. A large group health plan (100 or more employees) is primary for a beneficiary entitled by disability.

The distinction candidates miss: it is active employment, not merely having coverage. Retiree coverage for a 68-year-old does not make the group plan primary; Medicare is primary.

Exercise 3.13 †

Participating amount \$260.00:

The beneficiary pays \$86.45** net in the unassigned case against **\$52.00 with a participating provider — a difference of \$34.45 — and the provider collects \$284.05 against \$260.00.

Exercise 3.15 †

Charged \$640.00 · approved \$318.00 · Medicare paid \$254.40 · maximum billable \$63.60.

• Contractual adjustment: 640.00 − 318.00 = \$322.00
• Medicare's 80%: 318.00 × 0.80 = \$254.40 ✓
• Beneficiary's 20%: 318.00 × 0.20 = \$63.60 ✓
• Check: 254.40 + 63.60 = 318.00 ✓

The assumption the notice is making: that the Part B annual deductible has already been satisfied. If it had not, Medicare would have paid less (or nothing) and the "maximum you may be billed" figure would be higher, because the deductible portion is entirely the beneficiary's.

Exercise 3.17 †

Per encounter, expected collection by payer:

Sum: 99.4888 + 57.2016 + 14.6032 + 6.6060 = 177.8996 → \$177.90

On 1,000 encounters: \$177,900.** Against \$367,000 in charges — a gross collection rate of 48.5%, which tells you almost nothing (Chapter 23 §23.10), and against \$216,280 if every patient were commercial — a difference of \$38,380 on a thousand visits** attributable purely to payer mix.

Medicaid figure: 168.24 × 0.62 = 104.3088. Self-pay: 367.00 × 0.30 = 110.10. (Note that self-pay "collects" more per encounter here than Medicaid does, which is an artifact of the constructed percentages and worth discussing rather than generalizing — real self-pay collection rates on full charges are usually far lower.)

Exercise 3.19 †

1. Which contractor published it, and whether that contractor has your jurisdiction. An LCD from another MAC does not govern your claims.
2. The version and effective date. LCDs are revised; the policy in effect on the date of service governs, not the one currently displayed.
3. Whether there is a companion billing and coding article, which usually carries the diagnosis code list — the LCD alone may not contain it.
4. Whether an NCD exists for the service, which would supersede or constrain the LCD.

A fifth, worth adding: whether the policy has been retired, which the database will indicate.

Exercise 3.21 †

Send the claim to the Medicare Advantage plan. The patient is enrolled in Part C, so the plan adjudicates, not the MAC.

If you sent it to the MAC: it would be denied, typically with a reason code indicating the claim is not covered by this payer or contractor, and directing you to the correct payer. You would lose the time between submission and denial — commonly two to three weeks — against the plan's timely filing clock, which never stopped running.

Exercise 3.22 †

1. Revenue per service. Participating pays 100% of the fee schedule; non-participating pays 95% assigned, or up to the limiting charge (115% of 95% = 109.25% of the par amount) unassigned. The unassigned route is the highest gross revenue per service.
2. Collection burden. Participating and assigned claims are paid directly by Medicare, promptly and reliably. Unassigned claims must be collected in full from individual beneficiaries, who are then reimbursed by Medicare. That is a materially worse receivable with real collection cost.
3. Patient impact. In the worked example, the beneficiary's net out-of-pocket rises from \$52.00 to \$86.45 on a \$260.00 service. For a population without an out-of-pocket maximum, that is not trivial, and it will affect who chooses your practice.
4. Administrative consequences. Participating providers are listed in Medicare's directories and receive electronic remittance and direct deposit. Non-participation adds billing complexity and patient explanation.
5. The risk I would flag. The limiting charge is a legal cap, easily exceeded by a fee schedule that is not maintained, and trivially detectable in data. A practice choosing non-participation must build a control that prevents charging above the limiting charge on unassigned claims, or the revenue advantage becomes a refund obligation with penalty exposure.

Exercise 3.24 †

The problem: Qualified Medicare Beneficiaries may not be billed for Medicare deductibles, coinsurance, or copayments — regardless of whether the state Medicaid program actually pays them. A system that automatically transfers the Medicare patient-responsibility balance to a patient statement will bill them, and the violation is invisible because it happens by default.

The control: 1. Flag QMB status on the account at registration, from the eligibility response, and again from the Medicare remittance advice, which carries a QMB indicator. 2. Suppress automatic patient-responsibility transfer for flagged accounts; route them to a review queue instead. 3. After Medicaid adjudicates, write off any remaining Medicare cost sharing rather than billing it — including when Medicaid pays zero because its rate is below what Medicare already paid. 4. Audit monthly: run a report of statements issued to accounts with a QMB flag. The correct count is zero.

The control has to sit in the system, not in a person's memory, because the failure mode is automation.

Exercise 3.26 †

1. Check the NCCI procedure-to-procedure edit tables for the code pair. Most commercial bundling logic is adopted from or modeled on NCCI, and this resolves it more often than any other single step.
2. Read the NCCI Policy Manual chapter for the relevant CPT section. It explains the reasoning, which is what you need for an appeal.
3. Check the MUE table if the issue is units rather than a pair.
4. Search the payer's provider portal and published reimbursement policies. Many payers publish more than practices realize; it is simply not indexed well.
5. Call provider services and ask for the specific policy by name, and ask them to send it. Record the reference number and the representative's name.
6. Check the contract for a clause incorporating the payer's published policies — which tells you whether the policy is binding on you and whether it may change unilaterally (Chapter 2 §2.6).

What you expect to find: an NCCI edit, or a payer policy derived from one, with a modifier indicator that determines whether the edit may be overridden at all. Chapter 21.

Exercise 3.27 †

B — \$437.00.** \$400.00 × 0.95 = \$380.00; \$380.00 × 1.15 = \$437.00. Answer A (\$460.00) is 115% of the participating amount, which is the standard error.

Exercise 3.29 †

B — the group health plan. Age-65 entitlement, actively working, employer with 20 or more employees.

Exercise 3.31 †

B — a Qualified Medicare Beneficiary. Not every dual eligible falls in the QMB category, and not every Medicaid recipient has Medicare, so A and C are both overbroad.

Exercise 3.33 †

B. An ABN is for a normally covered service expected to be denied as not reasonable and necessary. It is not used for statutorily excluded services (A), and issuing it routinely to everyone (C) is improper and can invalidate it.

Exercise 3.34 †

Model answer (88 words):

"Thank you — this is a Medicare Advantage plan, which means your Medicare benefits are administered by this company rather than by Medicare directly. I'm checking our network status with them now, because we contract with plans individually. If we're not in their network, I want to tell you that before you're seen rather than after, and I'll go over what your options are — including whether the plan has an out-of-network benefit and what it would cost. Give me two minutes to confirm rather than guess."

Exercise 3.37 †

The discount is not uniform. It ranges from 0% on the venipuncture to nearly 25% on the office visit.

What that suggests: the commercial contract is not a flat percentage of Medicare across all services. Different service categories are priced by different mechanisms — the office visit and the procedure come off the physician fee schedule, the drug is priced by a drug methodology, and the venipuncture comes off the clinical laboratory fee schedule, where the commercial payer has simply adopted the Medicare amount. A contract described as "a percentage of Medicare" frequently applies that percentage to only some of its lines, and a practice that models its expected revenue as a single multiplier will be wrong in both directions. Chapter 23.

Exercise 3.39 †

What the practice collects. Medicare pays 80% of \$168.24 = **\$134.59. Medicaid, as secondary, applies its own allowed amount — which the exercise stipulates is below what Medicare already paid — and therefore pays \$0.00**. Total collected: **\$134.59**.

What the patient may be billed: \$0.00.

The rule: federal law prohibits providers from billing a Qualified Medicare Beneficiary for Medicare deductibles, coinsurance, or copayments, regardless of whether the state Medicaid program pays them. The \$33.65 in Medicare coinsurance is not collectible from the patient and must be written off. It is not a bad debt and it is not a courtesy; it is a legal prohibition, and billing it is a violation. See §3.8 and Exercise 3.24 for the control that prevents it.

Chapter 4

Exercise 4.1

A code is a description of what a provider wrote, not of what a provider did. The record is not evidence of the encounter for coding purposes; for coding purposes it is the encounter.

Exercise 4.3 †

The assessment. It is the provider's conclusion about what is wrong, stated in the provider's own words, and it is the section a diagnosis code must be traceable to.

Not the chief complaint, because the chief complaint is the patient's reason for coming. A patient presents with chest pain and the provider concludes gastroesophageal reflux disease. In the outpatient setting a confirmed diagnosis replaces the symptom that led to it (Chapter 9 §9.6), so the assessment governs. Coding from the chief complaint systematically produces symptom codes where definitive diagnoses exist.

Exercise 4.5

Requirements: the provider who furnished the service must sign; the signature must be legible or otherwise identifiable and attributable to a specific individual; it must be dated. Electronic signatures satisfy this with a name, credential, and timestamp.

Four defects: (1) no signature at all; (2) an illegible or unattributable signature; (3) a stamped signature, generally unacceptable for Medicare; (4) a missing signature on the order for a service that requires one — a separate defect from anything wrong with the note.

Exercise 4.6 †

Addendum — new information added after the original entry was completed. Must be clearly identified as an addendum, separately dated and signed, with the original entry intact.

Late entry — documentation of something that happened earlier but was never recorded. Identified as a late entry, dated with the current date, and stating the date of the service being documented.

Amendment/correction — a change to an existing entry. The original content must remain legible and retrievable, the change dated and signed, and the audit trail preserved.

The principle all three satisfy: you may add to the record and you may correct the record; you may never make it appear that the record always said something it did not.

Exercise 4.9 †

The legal health record is what an organization declares by policy to be its official business record — what it would produce in response to a subpoena. The designated record set is a HIPAA term for records used to make decisions about individuals, which patients may access and request amendment of.

The designated record set is generally broader, because it includes billing records and other material an organization might not include in its declared legal health record.

Why a coder cares: what gets produced for an audit is defined by policy rather than by convenience (Chapter 37 §37.7); patients have a right of access and a right to request amendment, which occasionally surfaces as a patient disputing a documented diagnosis; and the audit trail is part of the story either way.

Exercise 4.11

Non-leading (does not supply the answer, name a code, state a financial consequence, or signal a preference); presents the clinical evidence from the record that raises the question; offers clinically reasonable options including where appropriate "clinically undetermined" and "other"; and is documented and retained, with its response becoming part of the record.

Exercise 4.13 †

What you can code: type 2 diabetes mellitus, unspecified — the assessment says "diabetes" and the problem list specifies type 2. Chronic kidney disease, stage 4 — it is on the problem list; whether a problem-list entry alone is codeable for a given encounter depends on whether it was addressed, which this fragment does not show.

What you cannot code: any diabetic kidney disease, and any relationship between the two. The linkage must be documented. (Note: ICD-10-CM's "with" convention creates assumed relationships for certain code pairs — Chapter 9 §9.7 — and diabetes-with-CKD is one of the pairings where the convention has been interpreted to permit assumption in the Tabular. This exercise is deliberately posed before that material, and the safe answer at this point in the book is: do not infer a linkage the record does not state, and check the convention in Chapter 9 before you rely on either answer.)

What you would query: whether the CKD was addressed at this encounter, and — if a linkage matters for reporting — whether the provider attributes the CKD to the diabetes. Also worth querying: the insulin. The medication list includes it and the assessment says "continue current regimen"; long-term insulin use has its own reportable status code (Chapter 12).

Exercise 4.15 †

All three could affect coding.

• Adhesiolysis requiring 45 additional minutes — may support an increased-procedural-services modifier if the extra work is documented and substantial (Chapter 14).
• Intraoperative cholangiogram — is a separately identifiable service in some circumstances and bundled in others; the code selected for the cholecystectomy itself differs depending on whether a cholangiogram was performed (Chapter 18).
• Conversion to an open procedure — changes the code entirely. A converted procedure is generally coded as the open procedure, not the laparoscopic one.

What it demonstrates: the heading named a procedure that, by the end of the report, was not the procedure performed. A coder who codes from the heading would have billed a laparoscopic procedure that did not happen. Read the body. Always.

Exercise 4.17 †

The problem: the documentation asserts a comprehensive review of systems and a complete examination for a nine-minute medication refill. Either the documentation is false, or the visit was far more extensive than the schedule suggests. Almost certainly the former, produced by an auto-populating template.

The compliance exposure: the note supports a level of service the encounter did not contain. The provider signed it. If claims were selected at that level, the organization has submitted claims supported by documentation that asserts work not performed — which is the fact pattern in Case Study 1 and the reason the 2021 revision removed history and examination as office visit level drivers.

What I would do: (1) Code from what is actually supportable — for an office visit since 2021, the medical decision making or the time, neither of which is inflated by the template. A medication refill is a low-level visit regardless of how much text the template produced. (2) Raise the template configuration with whoever owns it, in the terms of §4.6 — the note is asserting things nobody did. (3) If the pattern is organization-wide, this is a compliance matter, not a coding preference, and it goes to the compliance officer.

Exercise 4.19 †

Faults in the original: names the diagnosis wanted, states the financial consequence, offers no alternative, asks for a conclusion rather than a clarification, and signals the preferred answer.

Compliant version:

Clarification is requested regarding the assessment for this admission.

The record documents: · Temperature 102.0°F on hospital day 1 · Intravenous antibiotics administered hospital days 1–4 · [Additional documented clinical indicators — vital signs, laboratory values, and the treating physician's documented observations — should be listed here from the actual record] · The assessment does not further specify the condition being treated

Based on your clinical judgment, can the condition be further specified? ( ) Sepsis ( ) Localized infection — please specify site ( ) Bacteremia ( ) Clinically undetermined ( ) Other: __

Please document your response in the medical record. This query is not intended to suggest any particular response.

Note that the compliant version does not invent clinical indicators. If the record does not contain enough indicators to support the question, the correct action is to ask nothing rather than to construct a case.

Exercise 4.21 †

Outpatient: code the documented signs, symptoms, or findings — not the possible diagnosis. The outpatient guideline prohibits coding uncertain diagnoses. "Possible acute blood loss anemia" supports coding the abnormal hemoglobin or the documented blood loss, not anemia.

Inpatient: code the condition as if it existed. The inpatient guideline permits coding a diagnosis documented at discharge as "probable," "suspected," "likely," or "possible" as though established, because the intent is to capture the diagnostic workup and resources consumed.

The rule that makes them different: ICD-10-CM Official Guidelines Section II/III (inpatient) versus Section IV (outpatient). Chapter 9 §9.5 covers it. This is one of the small number of places where the two settings do exactly opposite things, and it is examined constantly.

Exercise 4.23 †

Options, in order of preference:

1. Escalate the query through the established process — a second request, a call, or escalation to the physician advisor or department chair if the organization has one. Most query programs have a defined escalation path and a defined timeframe; use it.
2. Code what is documented and submit. A less specific code that is fully supported is always available and always defensible. The claim is not wrong; it is less specific than it could have been.
3. Hold the claim only if the timely filing window genuinely permits it and the organization's policy allows. This is rarely the right answer as a deadline approaches.

What is not available: coding the answer you expected the query to produce. An unanswered query is not an answer, and a coder who assigns the code they were hoping for has made the query pointless and created a false record.

Exercise 4.25 †

The answer is no, and it is not a close question.

Three reasons:

1. The timing becomes part of the record. Even a truthful, properly labeled addendum written after a records request carries a date the reviewer will see. Documentation that appears in response to a request is worth less than nothing evidentially — it invites the reviewer to look harder.
2. Improperly labeled, it is a false statement. An addendum that is not identified as one, or a note altered to appear contemporaneous, moves the organization from a payment problem to a potential fraud problem. The audit trail will show it.
3. The correct remedy exists and is cheaper. If the documentation is deficient, the finding is legitimate: accept it, repay what was billed without support, and fix the workflow. Chapter 37 §37.9. A repayment is survivable; a finding that records were altered after a request frequently is not.

What to say: "We send what we have. If some of these are thin, we'll find that out now instead of in a much worse way later — and I'd rather spend the afternoon figuring out which workflow produced the thin ones."

Exercise 4.27 †

The case, addressed to a practice manager:

Right now our notes assert a complete review of systems on every encounter, including visits where nobody asked twelve systems' worth of questions. Three consequences.

First, it is not true, and the provider signs it. That is the exposure, and it is the kind auditors find with a script rather than a reviewer.

Second, it no longer buys us anything. Since the 2021 revision, review of systems does not drive an office visit level. We are carrying the risk of a false assertion in exchange for a benefit that was eliminated.

Third, it makes our notes worse. A reviewer cannot tell our thorough visits from our brief ones, which weakens every appeal we file.

What it costs: a configuration change, and a short adjustment period in which providers fill in the ROS section themselves for the encounters where it matters clinically. There is no revenue impact under the current level-selection rules. The main cost is the conversation with the providers, and the framing that works is that the change makes their notes reflect what they actually do.

Exercise 4.29 †

B.

Exercise 4.31 †

C. Attestation identifies the author of an otherwise unsigned entry. It cannot supply a missing signature on an order (A), cannot add clinical content (B), and does not remedy an illegible note's content (D).

Exercise 4.33 †

B. In the outpatient setting, do not code a probable, suspected, or rule-out condition; code the documented signs, symptoms, or reason for the encounter. The inpatient rule is the opposite — Exercise 4.21.

Exercise 4.35 †

Model answer (98 words):

You know more medicine than I do, and that is going to make one part of this job harder rather than easier. When you read a note, you will see what happened, because you have been in that room a thousand times. The rule is that we code what the provider wrote, not what we can tell they did. Not because your judgment is unreliable — because the code is a statement to a payer about the record, and a stranger reading that record two years from now has only what is on the page. If it is not there, we query. We never supply it.

Exercise 4.38 †

Documented, by claim line:

Not documented:

• Any statement in the assessment that conservative therapy was tried and failed (it is in the HPI)
• Any statement that the decision to inject was made during this visit
• Any linkage between the chronic kidney disease on the problem list and the diabetes
• Whether the vial was single-dose or multi-dose, or whether any drug was discarded
• Total time (deliberately — the note says time was not used)
• Any type specification for the hyperlipidemia

Exercise 4.40 †

The sentence: "Six weeks of intermittent NSAID therapy has not adequately controlled symptoms, and the patient's function and sleep remain affected; intra-articular corticosteroid injection is therefore indicated at this visit."

Why a coder may not write it: it is a clinical assertion — that therapy failed and that the injection is therefore indicated — and only the treating provider may make it. Writing it would be creating documentation, which is the line §4.5 and §4.9 both draw.

Who may: the provider, prospectively, as part of how they document this kind of encounter. The coder's legitimate move is education, not authorship: show the provider what a reviewer looks for and where, and let them change what they write going forward. That is a template and training conversation, not a chart-by-chart one.

(A compliant query is a poor fit here, because nothing is ambiguous — the record is clear and complete for coding. The gap is in placement, not in content, and the remedy is prospective.)

Chapter 5

Exercise 5.1

That the services were actually furnished; that they were medically necessary; that the information is true, accurate, and complete; and that the claim complies with applicable law, including the Anti-Kickback Statute and the physician self-referral prohibition.

Exercise 5.3 †

The statute states expressly that no proof of specific intent to defraud is required.

Exercise 5.5 †

Exercise 5.7

Exclusion prohibits any federal health care program from paying for items or services furnished, ordered, or prescribed by the excluded person — and the prohibition extends to an excluded person employed in any capacity by a provider that bills federal programs, including administrative and management roles.

Why it ends employability: because essentially every American healthcare employer bills a federal program, employing an excluded person exposes them for every claim that person touches. There is no non-billing role that solves it. The exclusion does not restrict a job function; it makes the person unhirable across the sector.

Exercise 5.8 †

1. Written policies, procedures, and standards of conduct — so the rule exists outside someone's head.
2. A designated compliance officer and committee — so someone owns it, with access to leadership.
3. Effective training and education — so the rule reaches the people who apply it.
4. Effective lines of communication — so a person can report without going through the person they are reporting about.
5. Internal monitoring and auditing — so problems are found while they are still errors.
6. Enforcement through well-publicized disciplinary guidelines — so the rule has consistent consequences.
7. Prompt response to detected offenses and corrective action — so a finding produces a change.

Exercise 5.11 †

1. It is inaccurate. A code that understates the service misrepresents the encounter as surely as one that overstates it.
2. It forfeits earned revenue on every instance, permanently, with no offsetting benefit.
3. It corrupts downstream data — quality measurement, risk adjustment (Chapter 36), utilization analysis, and the practice's own understanding of its work.
4. It is not a legal defense. A false record is a false record in either direction, and nothing in the False Claims Act's text distinguishes the direction of the error.

The reason the belief persists is that downcoding does not get audited, because nobody audits for underpayment. That is a fact about detection, not about accuracy.

Exercise 5.13 †

(a) False Claims Act. The audit eleven months ago supplies the knowledge element; the continuation supplies the conduct. Intent to defraud need not be proven — this is deliberate ignorance at minimum. Also potentially the Civil Monetary Penalties Law.

(b) Anti-Kickback Statute. Free use of space is remuneration. Intent is required (knowing and willful), but the "one purpose" standard means the arrangement can violate the statute if inducing referrals was a purpose even among legitimate ones. Any resulting claims may also be false claims.

(c) Stark. A financial relationship plus referrals for designated health services with no applicable exception. No intent required — this is the strict liability provision, and "we never meant anything by it" is not responsive.

(d) False Claims Act, via the sixty-day overpayment rule. An identified overpayment retained past sixty days becomes an obligation, and improperly avoiding an obligation to repay is prohibited conduct. Eight months is not close.

(e) False Claims Act, reckless disregard. Also unbundling as a coding matter and potentially the Civil Monetary Penalties Law. Nobody formed an intent; the configuration operated at volume without review.

Exercise 5.15 †

Compromised elements:

• Element 2 (designated compliance officer) — the officer's independence is destroyed by reporting to the subject of the complaint.
• Element 4 (effective lines of communication) — a staff member cannot report the physician-owner's coding to a person who reports to that owner. Practically, the channel does not exist.
• Element 6 (enforcement) — disciplinary guidelines cannot be applied consistently to a person who controls the discipliner's employment.
• Element 7 (corrective action) — flows from the same problem.

Minimum viable fix for a six-person practice:

1. An external reporting route. A contracted compliance consultant, an attorney, or an external hotline that reports to all owners jointly rather than to one. This is inexpensive and it is the single highest-value change.
2. A written recusal rule stating that a compliance matter involving an owner is handled by the external route and that the owner is recused from the review.
3. External chart review for owner-provider coding, at least annually — because internal review by an employee of the owner is not credible even when it is honest.
4. Written non-retaliation commitment, signed by all owners.

A six-person practice cannot build a compliance department. It can buy independence for a few thousand dollars a year, and independence is the only element it genuinely cannot manufacture internally.

Exercise 5.17 †

(a) Line 3 carries a distinct-procedural-service modifier asserting that the debridement was separate from the rotator cuff repair. Under the correct coding edits, limited debridement in the same anatomic region as the repair is included in the repair. The operative notes document debridement of the same structures repaired — so the modifier asserts a distinction the documentation does not support. And the modifier was applied by a billing macro, not by a coder reading the note.

(b) Line 2 is an add-on code. Add-on codes describe additional work performed with a primary procedure and are expected to be reported alongside it. They are not subject to the multiple-procedure reduction and do not take modifier 51. Reporting an add-on code with its primary procedure is correct, not unbundling.

(c) Because the defense to an unbundling allegation is contemporaneous documentation that the debridement was distinct — and no operative note documented it. The surgeons' recollection may be accurate and is worth nothing evidentially, because nothing in the record distinguishes those 11 claims from the other 31.

(d) Demand: 42 × \$612.40 = **\$25,720.80. If the payer extrapolated across the full 18 months at the same error rate, the demand becomes the sampled rate projected across the universe of similar claims — which, for a practice performing this procedure regularly, could be several multiples of the sampled figure. Chapter 37 §37.6 works the arithmetic. The sample is not the exposure.**

Exercise 5.19 †

Three questions before this report is filed:

1. What is the look-back period, and what is the exposure across it? Twenty-five charts is a sample. The population is every claim for that service over the period the pattern existed. Sizing by the sample is the error Case Study 2 warns about.
2. Are we stopping or holding anything now? Every claim submitted after this report is a claim submitted with knowledge (§5.2). The report changes the practice's legal position on all subsequent claims immediately.
3. What is the corrective action, who owns it, and by when? "Recommend provider education" is not a corrective action plan. It names no owner, no deadline, and no re-audit.

What happens legally if it is filed and nothing else occurs: the report establishes the knowledge element. Every subsequent identical claim moves from error toward abuse and, with continuation, toward a knowing false claim. The audit becomes the government's exhibit. This is precisely §5.6's point that element 7 is the one organizations fail, and §5.2's point that an unactioned audit finding is the most dangerous document in an organization.

Exercise 5.21 †

Step 1 — Make sure you are right. Re-read the note. Confirm no time is documented anywhere, including in a separate attestation. Confirm the MDM analysis: what problems were addressed, what data, what risk. Check whether the practice has any standing guidance you have missed.

Step 2 — Ask, do not accuse. "I want to make sure I've got this right, because if you spent 45 minutes I don't want to underbill it. The note doesn't document time anywhere, and on decision making I'm getting to a three. Am I missing something in the record?"

Step 3 — Put it in writing. A short email restating the reading and the rule.

Step 4 — Code what is documented. Level 3. Not negotiable.

Step 5 — Escalate if instructed to code the 5 anyway.

Step 6 — Outside advice if the channel fails.

The legitimate path to a level 5: documenting the total time on the date of the encounter, contemporaneously. Under the 2021 framework, time is one of two permitted bases for selecting an office visit level (Chapter 15 §15.8), and 45 minutes of documented total time on the date of the encounter would support a higher level on its own. The physician's problem is not that they did not do the work. It is that the record does not contain the one fact that would prove it, and only they can supply it — prospectively.

Exercise 5.23 †

What you know: essentially all imaging referrals go to a facility that opened six months ago, and a physician-owner referred to "having a piece of" it.

What you do not know: whether the ownership interest is real, what its structure is, whether an exception applies, whether the referral pattern has any other explanation (proximity, scheduling capacity, quality, patient preference, an insurer's steerage), and whether anyone has already disclosed and structured the arrangement properly. A physician may lawfully own an imaging facility; whether these referrals are lawful depends on facts you do not have.

What you should do: report the observation — the referral pattern and the comment — through the compliance channel, factually, without characterizing it. Document that you did, with the date.

What you should not do: investigate it yourself; ask the physician about their ownership; discuss it with colleagues; state to anyone that there is a Stark or kickback problem; or, at the other extreme, decide it is not your business and say nothing. You are not being asked for a legal conclusion. You are the person who noticed, and noticing is the contribution.

Exercise 5.25 †

The exposure: accessing a record without a business reason is a HIPAA violation regardless of whether anything is disclosed. The Privacy Rule permits use for treatment, payment, and operations; curiosity is none of these. It is detected by audit log review, it is one of the most reliable causes of termination in healthcare, and it can carry individual penalty exposure. The absence of disclosure mitigates harm; it does not make the access permissible.

Your obligation: report it through the compliance channel. This is uncomfortable and it is not optional — the organization's Privacy Rule obligations include mitigating known violations, and knowledge held by workforce members is knowledge held by the organization. Say it factually and without characterization, as in 5.23. If your organization has an anonymous route, using it is legitimate.

Exercise 5.26 †

B.

Exercise 5.28 †

B — 60 days.

Exercise 5.30 †

B — payment and health care operations. Minimum necessary does not apply to disclosures for treatment.

Exercise 5.32 †

B.

Exercise 5.33 †

Model answer (138 words):

Subject: Level of service on the 3/14 encounters — my reading

Following up on our conversation so we have a record of where we landed.

I reviewed the six encounters. Each documents one stable chronic problem with a medication refill and no other addressed problems. Under the 2021 office visit guidelines, that supports low-complexity decision making. Total time is not documented on any of the six, so time-based selection is not available.

On that basis I have coded these as level 3. If the encounters involved work the notes do not capture, I would genuinely like to know — the documentation may be understating what is being done, and that is fixable going forward.

Happy to have compliance or an external auditor look at the same six if a second opinion would help.

Exercise 5.36 †

What Figure 4.2 contains that the counterfactual does not:

The sentence doing the most work: "Hemoglobin A1c ordered today to reassess control."

Because it is the clearest evidence of active management independent of the knee. Continuing a medication can be characterized as administrative; ordering a test with a stated diagnostic purpose is an evaluation and a decision, on a problem the procedure had nothing to do with. It is the hardest single item for a reviewer to dismiss.

Exercise 5.38 †

Yes — and this is the point of the question.

The claim itself is accurate. The documentation supports modifier 25. If this single claim were reviewed in isolation, it would pass.

But the practice's process is to append the modifier by rule, without anyone reading a note. That process:

• produces correct claims by coincidence rather than by determination;
• will produce incorrect claims wherever the documentation does not happen to support the modifier, at whatever rate that occurs; and
• constitutes reckless disregard under § 3729(b)(1) with respect to the population of claims — the organization is not looking, at volume, at a question that determines whether its claims are true.

The distinction to hold: an individual claim's accuracy is judged on its documentation. An organization's exposure is judged on its process. A practice whose claims are right by accident has the same knowledge posture as one whose claims are wrong by accident, and the only thing separating them is which way the underlying documentation happened to fall.

This is exactly the fact pattern in Figure 5.1, with a luckier outcome on the sampled claim.

Chapter 6

Exercise 6.1

Exercise 6.3 †

The two parts used in a fixed order: the Alphabetic Index (look up the condition by name) and the Tabular List (verify it and read the instructions that govern it). Index first, always.

The three specialty tables: the Table of Neoplasms, the Table of Drugs and Chemicals, and the External Cause Index.

At the front: the Official Guidelines for Coding and Reporting — free, reissued annually, binding for the code set under HIPAA, and unread front to back by most working coders.

Exercise 6.5 †

1. Whether the documentation supports the code. It has not read the note and cannot.
2. Which of two defensible codes better describes what happened.
3. Whether a query is needed.
4. Whether the guidelines' conventions were correctly applied — it will flag a hard conflict and will not catch a judgment error.
5. Whether the code you entered is the code you meant.

Exercise 6.7

The EHR owns the clinical record: notes, orders, results, medications, problem list, images, audit trail. The PMS owns the financial record: demographics, guarantor, insurance, scheduling, charges, claims, payments, adjustments, accounts receivable, statements.

The coder sits between them — reading left, writing right. In a non-integrated environment the interface between the two is where charges are lost, silently, producing no error and no denial (Chapter 1 §1.8, leak 2).

Exercise 6.8 †

A superbill or encounter form is a checklist of a practice's common codes on which a provider marks what was done.

It is not a coding decision because it is a communication tool — a provider's indication of what happened, not a verified assignment from documentation. Coding from a superbill without opening the note is coding from a checkbox, which is Chapter 5 §5.3's reckless disregard in its most ordinary form.

It decays because it is built once and the code sets change annually and quarterly. A superbill not reviewed since the last two update cycles contains deleted codes, lacks new and more specific ones, and — most dangerously — may carry codes whose descriptors changed while the numbers stayed the same, which produces no rejection at all.

Exercise 6.11 †

  JANUARY 1     CPT: new, deleted, revised codes; revised guidelines;
                new and revised modifiers. Medicare conversion factor
                and fee schedule take effect.

  QUARTERLY     HCPCS Level II updates.
  (Jan/Apr/     NCCI procedure-to-procedure edits update.
   Jul/Oct)     MUE values update.

  OCTOBER 1     ICD-10-CM: new, deleted, revised codes; revised
                Official Guidelines. Hospital inpatient payment year
                begins — new MS-DRG assignments and weights.

  CONTINUOUS    LCDs revised. Payer policies change. Nothing
                announces this to you.

Exercise 6.13 †

The Tabular List. The seventh-character requirement is stated as an instruction at the category level — not at the individual code — so you must be looking at the category in the Tabular to see it. An index entry will not tell you, and this is one of several reasons the two-step rule exists (Chapter 8 §8.1).

Exercise 6.15 †

The Medicare Coverage Database, searched by code. Then, within it: the LCD for the policy, and its companion billing and coding article for the list of ICD-10-CM codes that support medical necessity.

Then verify two things about the version: that the publishing contractor's jurisdiction is yours, and that the effective date covers the date of service.

Exercise 6.17 †

The CPT surgery section guidelines, at the front of the Surgery section. They define what the surgical package includes.

Then, for the specific global period assigned to that code, the Medicare Physician Fee Schedule relative value file, which carries the global period indicator (000, 010, 090, XXX, YYY, ZZZ). Chapter 17 §17.2.

Note that these are two different sources answering two halves of one question — CPT defines what the package is; the fee schedule file says how many days it runs for that specific code.

Exercise 6.19 †

The NUCC 1500 Health Insurance Claim Form Reference Instruction Manual, free from the National Uniform Claim Committee. It is the authoritative field-by-field instruction for the CMS-1500 and it answers questions that no coding reference does. Chapter 25.

Exercise 6.22 †

Two things:

1. Verify the code in the Tabular List exactly as you would verify a code found in the paper index. The two-step rule does not stop applying because step one happened on a screen.
2. Re-check the pathway answers against the note. Every answer you gave narrowed the result, and a single answer given from assumption rather than from documentation produces a confidently wrong code with no indication that anything went wrong.

Why the output is not sufficient: an encoder's result carries exactly as much reliability as the weakest answer in the pathway, and the pathway does not show you which answer that was. The output looks authoritative, which makes it more dangerous than a paper error, not less.

Exercise 6.24 †

The half-day project:

1. Export the edit engine's rule configuration. In most systems this is a menu item and has always been available.
2. For each rule, document what it changes, on which claims, and to which payers.
3. For each rule, identify an owner — someone who can explain why it exists and confirm it is still needed. Expect that several will have none.
4. For each rule, pull a month of affected claims and read ten of them. This is the step that finds things, and it is the step inventories skip. A rule's description tells you what it was meant to do; its output tells you what it does.
5. Classify: keep (documented, current, owned), delete (nobody can justify), or escalate (it changes the factual content of claims and the change may not be supportable).

The output: a one-page register — rule, what it does, why, owner, last reviewed.

The ongoing control: a quarterly review of the register, with a named owner, and a rule that no new automatic rule is added without an entry in the register. Without that last part, the register is obsolete in a year.

Exercise 6.25

It is the first week of October, so the queue straddles the ICD-10-CM effective date.

What I do differently: check the date of service on every encounter before opening any reference. September 26 through September 30 encounters are coded from the prior year's ICD-10-CM; October 1 onward from the new one. I would physically separate the two groups and work them in blocks rather than interleaved, to avoid switching mental context every chart.

Why: a code is assigned according to the code set in effect on the date of service, not the date of coding. Working across the boundary is the single most reliable source of seasonal error in this profession, and blocking by date eliminates it.

I would also confirm that the encoder, the practice management system, and the scrubber have all three been updated, since they are separate updates that do not always happen together.

Exercise 6.26 †

The conversation: request it directly and frame it as a question about the standard's basis, not as a complaint about the standard.

The evidence I would bring: my own time data broken down by encounter type — showing which categories take longest and why. Whether the difference is concentrated (a specific service, a specific provider's documentation) or general matters enormously to what the answer should be.

What I would ask for, in order:

1. What is the standard based on? Which setting, which encounter mix, measured how. A standard imported from a different specialty or a different documentation environment is not a standard, it is a number.
2. How is quality measured, and with what weight? §6.9's rule: any metric improvable by looking less carefully needs a quality metric of equal weight beside it. If quality is not measured, the productivity standard is effectively an instruction to look less carefully.
3. Is the mix comparable? If my queue carries the complex charts, volume comparisons are meaningless.
4. A defined ramp, if I am new. Productivity rises with familiarity, and a standard applied from week one to a new coder measures onboarding rather than performance.

What I would not do: meet the standard by not opening notes. That is the point at which a performance problem becomes a compliance problem, and it becomes my compliance problem.

Exercise 6.28 †

The follow-up question: "And if I pick something reasonable and I'm wrong, how would we find out?"

The question is worth asking in an interview, not just in the first week — and the answer tells you more about the organization than anything else you will hear.

Exercise 6.30 †

The problem: for nine days, the practice is coding services furnished on or after January 1 using an encoder loaded with the prior year's CPT.

The exposure: deleted codes billed (which will reject, and are the least dangerous); new and more specific codes unavailable, producing less specific coding than the record supports; and — the serious one — codes whose descriptors changed while the numbers stayed the same, which produces no rejection and bills the right number for the wrong service.

What I would do between January 1 and January 10:

1. Escalate the update date. Nine days is a choice, not a constraint, and it should be made deliberately by someone who understands the exposure.
2. Get the summary of changes and identify which codes the practice actually bills that were deleted, added, or revised. For most practices this is a short list.
3. Work from the paper book or the CMS files for the affected codes, not from the encoder.
4. Hold rather than submit claims involving affected codes if the volume is small enough to make that practical.
5. Flag every claim coded during the gap so that a targeted review can be run after the update, rather than discovering the problem in a denial pattern two months later.

Exercise 6.31 †

D — October 1.

Exercise 6.33 †

C — quarterly.

Exercise 6.35 †

B — inpatient hospital procedures.

Exercise 6.37 †

Update-cycle checklist (applies to both January 1 and October 1; adjust the code set)

Exercise 6.40 †

Why conflating them produces a confident wrong answer: each has a different source, and each can be answered "yes" while another is "no." A coder who finds a modifier indicator of 1 in the edit table and concludes "so I can bill them together" has answered row 7 and said nothing about row 6 (whether the documentation supports the assertion the modifier makes) or row 9 (whether the service is covered at all).

The three failures this produces: appending a modifier that is permitted by the edit and unsupported by the note (Chapter 5's exposure); omitting a required modifier because the service is covered; and billing a covered, properly modified service that a frequency limit excludes.

Exercise 6.42 †

Why no reference appears in row 2: because a code is a description of what the provider wrote (Chapter 4 §4.7). No book, database, encoder, or manual contains that. The note is the only source, and it is not a source you consult — it is the thing everything else is about.

What it implies for the other twelve rows: every one of them presupposes an answer to row 2. Rows 3 and 4 ask which code describes the condition the note documents. Rows 5 through 8 ask about the procedure the note documents. Row 9 asks whether that service, for that documented diagnosis, is covered. Rows 10 through 13 all describe the same encounter.

So the order is not arbitrary; it is a dependency chain. A workflow that begins anywhere other than the note has inverted it — and the characteristic symptom of an inverted workflow is a coder who has selected a code and is then reading the note to see whether it fits, which is Chapter 4 §4.10's warning about reading front to back rather than assessment-first.

Chapter 7

Exercise 7.1

A classification sorts an unbounded set of clinical realities into a bounded set of categories such that every case has exactly one place, with similar cases near each other.

Two constraints follow: every case must have a place — which is why unspecified and "not elsewhere classified" codes exist — and every case must have only one place, which is why Excludes1 notes exist.

Exercise 7.3 †

Neoplasms C00–D49 · circulatory I00–I99 · musculoskeletal M00–M99 · genitourinary N00–N99 · symptoms and signs R00–R99 · factors influencing health status Z00–Z99.

Exercise 7.5 †

Chapters 1–5 (infectious, neoplasms, blood/immune, endocrine, mental) are organized by etiology or category of disease rather than by body system. Chapters 15–17 (pregnancy, perinatal, congenital) are organized by the patient.

The consequence: where a condition could be classified two ways, these chapters take precedence. A malignant neoplasm of the kidney is coded from chapter 2, not chapter 14. And the Tabular tells you — through Excludes notes at the block and category level in the body-system chapters, which is why the two-step rule is not negotiable.

Exercise 7.7 †

A three-character category is a valid code only when it has no further subdivision. I10 is one.

If it is reported when the category does subdivide, the code is invalid and will reject. It is not a less specific version of the right code; it is not a code at all.

Exercise 7.9 †

The placeholder X fills an empty character position so that a required seventh character sits in the seventh position.

The rule: if a code requires a seventh character and has fewer than six characters, X fills every empty position up to the sixth. A three-character category needs three; a four-character code needs two; a five-character code needs one.

Exercise 7.12 †

The pattern: generally 1 = right, 2 = left, 3 = bilateral where provided, 9 or 0 = unspecified.

The warning that matters more: the assignments are not universal. They vary between categories. Some categories provide a bilateral option and some do not. Some use 0 for unspecified and some use 9. The character position varies — M25.561 carries laterality in the sixth character; other categories carry it elsewhere. Verify in the Tabular, for every category, every time.

Exercise 7.16 †

J44.1 — J → chapter 10, respiratory (J00–J99). J44 → category, other chronic obstructive pulmonary disease. .1 → fourth character, with (acute) exacerbation. Four characters, complete.

Note this is a combination code: it carries the underlying disease and its acute state in one code.

Exercise 7.18 †

N18.31 — N → chapter 14, genitourinary (N00–N99). N18 → category, chronic kidney disease. .3 → fourth character, stage 3. .31 → fifth character, stage 3a. Five characters, complete.

Exercise 7.20 †

S52.501D — S → chapter 19, injury (S00–T88). S52 → fracture of forearm. .5 → lower end of radius. .50 → unspecified fracture of the lower end of radius. .501 → right. D → seventh character: subsequent encounter for fracture with routine healing.

Seven characters. No placeholder needed — the code already has six before the extension.

Exercise 7.22 †

W19.XXXA — W → chapter 20, external causes (V00–Y99). W19 → category, unspecified fall. X, X, X → placeholders in positions 4, 5, and 6, which carry no meaning for this code. A → seventh character, initial encounter.

Exercise 7.24 †

Invalid, if the intended code is M25.561. M25.5 is a four-character subcategory that subdivides further; it is not a reportable code.

(Note the nuance the exercise is testing: the question is not "does M25.5 appear in the book" — it does, as a subcategory heading — but whether it is a valid reportable code. It is not.)

Exercise 7.26 †

Invalid. W19 requires a seventh character and is a three-character category, so it needs three placeholders. The correct form is W19.XXXA. As written, the A sits in the fourth position.

Exercise 7.28 †

Invalid. T39.1XA has six characters; the A is in the sixth position. T39.1 needs a placeholder in the fifth position and a sixth character indicating intent, before the seventh character. The correct form for accidental poisoning, initial encounter, is T39.1X1A.

This is the harder of the two placeholder questions, because the error is not a missing placeholder — it is a missing meaningful sixth character, which a coder who has learned "add X until it's long enough" will fill with an X and get wrong.

Exercise 7.31 †

Report both M25.561 and M25.562. This category provides no bilateral code, so bilateral involvement is reported with both the right and left codes.

The plausible wrong answer: M25.569, unspecified knee. It is wrong because unspecified means "the record does not say which," not "both." It understates the condition, it may fail a coverage policy that lists specific codes, and it describes a patient with one affected knee rather than two.

And verify — other categories do provide bilateral codes, and where one exists, reporting right and left separately is the error instead.

Exercise 7.33 †

A combination code (E11.22) would assert that the chronic kidney disease is diabetic — that is, caused by the diabetes.

Whether you may use it depends on a convention this chapter has not yet taught. ICD-10-CM's "with" convention (Chapter 9 §9.7) creates assumed causal relationships for certain code pairings when they appear in the Alphabetic Index under the word "with," and diabetes-with-CKD is among the pairings where that convention has been interpreted to permit the assumption without an explicitly documented link.

So the honest answer at this point in the book is: check Chapter 9 §9.7 before deciding, and do not assume in either direction. What you would need is either an explicit documented linkage, or the applicable convention plus documentation that both conditions were addressed at this encounter.

(Account 10-4471 is not resolved by this reasoning, and Chapter 36 owns it. The note's assessment addresses the diabetes and does not mention the kidney disease at all, which is a separate question from whether a linkage may be assumed.)

Exercise 7.35 †

Why it is a validity rule: a code exists at a defined character length. Reporting it shorter does not produce a less precise version of the same code; it produces a string that is not in the code set. The claim rejects because the code does not exist.

Why always-unspecified is a different error: an unspecified code at its full length is entirely valid. The error there is not validity but accuracy — assigning a valid code that understates what the record documents. That is downcoding (Chapter 5 §5.8), it forfeits nothing on this claim and a great deal downstream (§7.9), and it is not a defense.

The two errors are on different axes, which is why a coder can commit both in the same week without noticing the contradiction.

Exercise 7.37 †

C — seven.

Exercise 7.39 †

D — W19.XXXA.

Exercise 7.41 †

B — a subsequent encounter during routine healing or recovery. Answer A is the standard wrong answer and it is wrong because the character is defined by the kind of care, not by which visit it is.

Exercise 7.43 †

B — sequenced after the underlying condition.

Exercise 7.45 †

Model answer (118 words):

"Initial encounter" sounds like it means the first visit. It does not. It means the patient is receiving active treatment for the condition — evaluation, surgical treatment, setting a fracture, the emergency visit. "Subsequent" means active treatment is finished and the patient is receiving routine care during healing — cast checks, follow-up films, suture removal.

So a patient can have four encounters that are all "initial," because active treatment kept going. And a patient's very first visit to you can be "subsequent," if someone else did the active treatment and you are handling the follow-up.

Ask "what kind of care is this?" — never "which visit is this?"

Exercise 7.48 †

M25.561: chapter 13 (M00–M99, musculoskeletal) → block M20–M25 (other joint disorders) → category M25 (other joint disorder, NEC) → M25.5 (pain in joint) → M25.56 (pain in knee) → M25.561 (right).

Six characters. No seventh character required. Laterality in the sixth.

Exercise 7.50 †

The three places Figure 4.2 documents laterality:

1. The assessment: "Right knee pain — new complaint this visit."
2. The examination: "RIGHT KNEE — no effusion appreciated…" with a full description, and "LEFT KNEE — normal."
3. The procedure note: "Right knee intra-articular injection… Using a lateral suprapatellar approach…"

Why that matters more than the assessment saying "right": because in most notes it does not. §7.9's thirty-second search exists for the ordinary case where the assessment says "knee pain" and the laterality is documented elsewhere or not at all.

Figure 4.2 is what redundantly documented laterality looks like, and seeing it once establishes the baseline against which real notes are read. It also means this particular claim's laterality is not merely defensible but corroborated three ways — which matters if it is ever audited, because a single mention can be a typo and three consistent mentions cannot.

Chapter 8

Exercise 8.1

Alphabetic Index first, Tabular List second, always.

Step one protects against: not finding the code at all, because the classification files conditions under names you would not guess; and missing synonyms, eponyms, abbreviations, and lay terms that the index maps to the same place.

Step two protects against: reporting an incomplete or invalid code (the index prints a dash rather than the whole code); and missing every instruction that governs the code — seventh characters, Excludes notes, companion-code requirements, and laterality options — all of which are printed above the code where the index never takes you.

Exercise 8.3 †

A main term is a condition — what is wrong, not where.

Four other categories of main term: encounter nouns (Encounter, Examination, Screening, Aftercare, History); eponyms (conditions named for a person); abbreviations; and the general disease name where the specific one is filed elsewhere.

Exercise 8.5 †

Parentheses are permission to ignore; indentation is a requirement to document.

Exercise 8.7 †

Excludes1 — "not coded here." The two conditions cannot occur together; never report both.

Excludes2 — "not included here." The excluded condition is not part of this code, but a patient may have both, and both may be reported when both are documented.

Memory aid: Excludes1 — only one of them. Excludes2 — you may need two.

Exercise 8.9 †

"Code first" and "use additional code" are the same relationship viewed from opposite ends and frequently appear as a matched pair.

Exercise 8.12 †

"And" means "and/or." A category titled "bones and joints" covers bones, joints, or both; it does not require both.

"With" means "associated with" or "due to," and it can create an assumed causal relationship between two conditions when they appear together in the Index or in a Tabular instructional note.

"With" gets its own section in Chapter 9 (§9.7) because it is not merely a vocabulary convention — it is the mechanism by which the classification permits a coder to link two conditions without an explicitly documented causal statement, which is a direct and deliberate exception to Chapter 4 §4.7's rule against inference. That is a large enough idea to need its own treatment, and it is the question Chapters 4 and 7 both deferred.

Exercise 8.15 †

Appendicitis. (Not Abdomen, not Inflammation.)

Exercise 8.17 †

Examination — or Encounter. Both are legitimate entry points for a routine physical; they converge.

Exercise 8.19 †

Diabetes. Not Neuropathy and not Nerve. Diabetic complications are indexed under the diabetes main term with the complication as a subterm — which is also how the classification signals that a combination code is likely.

Exercise 8.21 †

Encounter — for antineoplastic chemotherapy. Not Chemotherapy as a procedure and not the cancer itself; the reason for this encounter is the administration of chemotherapy, and the sequencing rule is Chapter 10 §10.5.

Exercise 8.24 †

I10.

"Benign" appears in parentheses as a nonessential modifier. Nonessential modifiers are alternate wording that does not change the code and need not be present in the documentation — so "hypertension," "benign hypertension," and "essential hypertension" all reach the same code.

The intuition this defeats is that more words in the note produce a more specific code. Here they produce nothing at all.

Exercise 8.26 †

Yes, the category applies.

The convention "and" means "and/or." A category titled "Tuberculosis of bones and joints" covers tuberculosis of bones, of joints, or of both. It does not require both to be present.

This convention catches people because ordinary English "and" is conjunctive. In ICD-10-CM it is not.

Exercise 8.28 †

Check whether the two conditions are genuinely unrelated in this patient.

The Official Guidelines provide a narrow exception to Excludes1: where the two conditions joined by the note are unrelated to each other, both may be reported. Where it is unclear whether they are related, the guidance directs that the provider be queried.

What you may not do: decide for yourself that they are unrelated in order to report both. Relatedness is a clinical determination and Chapter 4 §4.7 forbids a coder from supplying one. That is the same error as deciding two conditions are related in order to use a combination code.

So: query if unclear; report both only if the record establishes they are unrelated; otherwise the Excludes1 note governs and you have the wrong code.

Exercise 8.30 †

People misread "code also" as optional — as though it meant "you may also wish to consider."

It is not optional. It requires two codes. What it declines to do is dictate their order, because sequencing depends on the circumstances of the encounter — specifically, on which condition was the reason for the encounter (Chapter 9 §9.9).

So "code also" is the instruction that requires the most judgment: it tells you both codes are needed and hands you the sequencing decision.

Exercise 8.31 †

Wrong turn: looking up Knee (Knee — see condition), or taking the main term code R52 for Pain, which is generalized pain.

The path: Main term Pain(s) → subterm joint → subterm knee → M25.56-. The dash sends you to the Tabular. There: laterality in the sixth character, M25.562 for the left knee. No seventh character required. No Excludes note applies.

Exercise 8.33 †

Wrong turn: looking up Mammogram or Mammography. Those are procedures; this is the diagnosis index. There is no disease here — the encounter itself is the reason.

The path: Main term Screening → malignant neoplasm → breast → Z12.31. Verify in the Tabular. Chapter 21 territory; Chapter 12 §12.9 covers why a person with no complaint has a diagnosis code.

Exercise 8.35 †

The path: Main term Diabetes, diabetic → the index's structure branches by type and complication → type 2, without complication → E11.9. Verify in the Tabular.

What the Tabular adds that the index did not: the E11 category carries instructional notes, including a use additional code instruction to identify certain associated conditions and long-term drug therapy where applicable. Read them. This is exactly the situation in Chapter 8's Case Study 2 — the code is right and there may be a second code the index never mentioned.

The wrong turn: assuming "without complications" from the absence of a documented complication. It is the correct code when the record documents no complication addressed at this encounter — which is a reading of the record, not an inference from silence, and Chapter 9 §9.7 complicates it.

Exercise 8.37 †

Wrong turn 1: the Table of Drugs and Chemicals, poisoning column. The drug was taken as prescribed, so this is an adverse effect, not a poisoning.

Wrong turn 2: reporting only the drug code. An adverse effect is coded with the manifestation first.

The path: code the rash from the main Alphabetic Index (main term Rash, or the more specific dermatitis term the record supports). Then the Table of Drugs and Chemicals → the substance → the adverse effect column → the T-code, with its seventh character, which the table does not display. Sequence: manifestation first, drug code second. Chapter 12 §12.6.

Exercise 8.39 †

B.

Exercise 8.41 †

B — the documentation is specific but the classification has no code for the condition. Answer A describes NOS.

Exercise 8.43 †

B — conditions.

Exercise 8.45 †

C — adverse effect.

Exercise 8.47 †

Model answer (117 words):

Most of them don't take four minutes — most are under two. The four-minute ones are the ones where I open the book and find something.

Last October a category we use constantly picked up a laterality character. The old five-character code became invalid. We caught it in about forty claims because they rejected — but the same update added a "use additional code" note to a different category, and that one doesn't reject. The claim pays and we're just underreporting.

I don't look codes up because I might misremember them. I look them up because the book changes and nothing tells us when. It's the only control we have on the changes that don't announce themselves.

Exercise 8.50 †

Wrong turn 1: Knee → Knee — see condition. The index does not index body parts.

Wrong turn 2: Pain → take R52 and stop. R52 is pain, unspecified — generalized pain — and the code is valid, payable, and wrong.

The path: Pain(s) → joint (M25.50) → knee (M25.56-) → Tabular → M25.561 / M25.562 / M25.569 → documentation supports right → M25.561.

What step two produced that step one did not:

Three of the four are negative. The one that is not — the laterality character — was not available from the index at all, which had printed a dash in its place. Without step two there is no complete code.

Exercise 8.52 †

Diagnosis A — M25.561:

Main term Pain(s); subterm joint; subterm knee; index gave M25.56- with a dash. Verified in Tabular category M25: no seventh character required, no Excludes note applicable to this patient, laterality carried in the sixth character. Documentation supports right knee in the assessment, the examination, and the procedure note. Assigned M25.561.

Diagnosis C — I10:

Main term Hypertension; nonessential modifiers (accelerated) (benign) (essential) (malignant) (primary) (systemic) — none required, none present, none affecting the code. Index gave I10 complete at three characters. Verified in Tabular: I10 is a valid three-character code with no further subdivision. Category notes reviewed; none applicable. Assigned I10.

What is different about the second one: the index gave a complete code with no dash, because the category does not subdivide — one of the relatively few three-character codes (Chapter 7 §7.3). And the modifiers were nonessential, so the documented word "essential" changed nothing.

Step two still mattered, for a different reason: I10 sits in a category with substantial instructional content about hypertensive conditions, and confirming that none of it applied is part of the path. A negative finding is a finding, and it is the part of the record that says you looked.

Chapter 9

Exercise 9.1

The Official Guidelines are the rules for assigning and sequencing ICD-10-CM codes. They are approved jointly by the Cooperating Parties — NCHS, CMS, the American Hospital Association, and AHIMA. Their status: required. They accompany and complement the conventions and instructions in the code set, and ICD-10-CM is a national standard under the HIPAA Transactions and Code Sets rule, which brought the conventions and guidelines with it. A code assigned against them is incorrect.

Exercise 9.3 †

The first-listed diagnosis is the condition, problem, or other reason chiefly responsible for the services provided at this encounter.

What determines it: the encounter — why the patient was seen and what was done.

What explicitly does not: severity, chronicity, or how serious the patient's other conditions are. A patient with heart failure, diabetes, and hypertension seen for a wart removal has the wart first.

Exercise 9.5 †

Outpatient (Section IV): do not code diagnoses documented as probable, suspected, questionable, rule out, compatible with, consistent with, or working diagnosis. Code the documented signs, symptoms, abnormal test results, or other reason for the visit.

Inpatient (Section II): code a diagnosis documented at the time of discharge as probable, suspected, likely, questionable, possible, or still to be ruled out as if it existed or was established.

Why they differ: the outpatient rule protects the patient and the record — an office visit is a snapshot, coding a guess as established puts a disease on a permanent record with consequences for future care and insurability, and documented symptoms are usually available to code instead. The inpatient rule captures the workup — an admission consumed substantial resources pursuing a diagnosis, and coding only symptoms would describe a multi-day investigation as though nothing had been determined.

The shared logic: each rule codes what its setting actually establishes.

Exercise 9.7 †

The convention: where "with" or "in" appears in a code title, the Alphabetic Index, or a Tabular instructional note linking two conditions, the classification presumes a causal relationship, and the conditions are coded as related even in the absence of explicit provider documentation linking them.

Two boundaries: (1) the presumption applies only where the classification creates the link — not wherever the word "with" appears in a clinical note; (2) it does not extend to pairings the classification has not made, and extending it is the inference Chapter 4 §4.7 forbids.

What defeats it: documentation clearly stating the conditions are unrelated.

(A third limit: where chapter-specific guidance requires an explicitly documented linkage, that requirement governs and the presumption does not override it.)

Exercise 9.9

Code first instructions; etiology/manifestation pairs; the acute-before-chronic rule; chapter-specific sequencing rules in Section I.C (sepsis, obstetrics, HIV, neoplasms with chemotherapy, poisoning, and others); Section IV's first-listed rule; and Sections II/III's principal diagnosis rule.

Exercise 9.10 †

1. Specific beats general — a chapter-specific guideline governs over a general one; an instruction at the code governs over one at the category.
2. The Guidelines beat the code book's conventions.
3. The Tabular beats the Index.
4. Explicit provider documentation beats a presumption.
5. Then: Coding Clinic, then your MAC, then a documented decision with the reasoning recorded.

Deliberately absent: what pays more. It is not a tiebreaker and it is not a consideration.

Exercise 9.11 †

(a) Office — outpatient, Section IV. "Rule out GERD" is not coded. Code the chest pain.

(b) Inpatient discharge summary — Section II. "Probable pneumonia" documented at discharge is coded as if established. Code the pneumonia.

(c) Emergency department, discharged home — OUTPATIENT, Section IV. This is the trap. "Possible appendicitis" is not coded. Code the abdominal pain and nausea.

(d) Office — outpatient. Two things are happening. "Likely musculoskeletal" is uncertain and is not coded; code the chest pain. The GERD is confirmed by prior endoscopy and documented as ongoing — if it was addressed at this encounter it is reportable as an additional diagnosis. The uncertainty attaches to the chest pain's cause, not to the GERD.

Exercise 9.13 †

Code both, acute first.

The three conditions hold: the same condition (systolic heart failure) is documented as both acute and chronic; separate index subentries exist; and they are at the same indentation level. Sequence the acute code first.

(Verify in the current index — heart failure is a category where combination and specificity options have changed, and if a single code fully describes "acute on chronic," that code governs instead under the combination-code rule, Chapter 7 §7.8.)

Exercise 9.15 †

No, you may not code them as related.

The difference from 9.14: in 9.14, the Alphabetic Index links diabetes and the condition under "with," so the classification has made the causal judgment and the presumption applies. Here, the classification has not linked type 2 diabetes and osteoarthritis of the knee — there is no index entry joining them under "with."

With no classification-created linkage, Chapter 4 §4.7 governs: a causal relationship requires provider documentation. Inferring one because it is clinically plausible is exactly the extension §9.7's boundaries forbid and Case Study 1 describes as the most-abused reading of the convention.

The discriminating question is not clinical. It is: did the classification link these two, or did I?

Exercise 9.17 †

The chronic-disease follow-up is the first-listed diagnosis, on the facts as given — the encounter was scheduled for it, and it is chiefly responsible for the services provided.

What would change the answer: if the new symptom drove the bulk of the encounter's work — its own history, examination, diagnostic decision-making, and a procedure — then it may be the condition chiefly responsible for the services, and it would be sequenced first.

And the honest addition: where two conditions are genuinely equally responsible and no rule fixes the order, §9.9 says either may be sequenced first. What is not free is that on a professional claim, each service line must point to the diagnoses supporting that line (Chapter 25 §25.5) — so the sequencing question and the pointing question are different, and the second one is not discretionary.

Exercise 9.19 †

Setting: office — outpatient, Section IV.

Code: the cough, the fever, and the shortness of breath — the documented signs and symptoms.

Do not code: pneumonia. It is documented as "rule out," and Section IV prohibits coding probable, suspected, or rule-out diagnoses in the outpatient setting.

The rule for each: the symptoms are coded because no definitive diagnosis was established (§9.6, and Section IV expressly permits symptom codes in that circumstance). The pneumonia is not coded because of the outpatient uncertain-diagnosis rule (§9.5).

Note what is not an argument for coding it: that antibiotics were started. Treatment initiated on suspicion does not convert a suspicion into an established diagnosis, and the record still says "rule out."

Exercise 9.21 †

Likely cause: the diagnosis supporting the service is not in the first-listed position, and the payer's edit evaluated the first-listed diagnosis against its coverage policy. Everything needed is on the claim, in the wrong order.

The fix: resequence so the diagnosis chiefly responsible for the service is first-listed, and — more precisely — ensure the diagnosis pointers link each service line to the diagnoses supporting it.

The chapter that covers the mechanism: Chapter 25 §25.5, diagnosis pointers and the four-per-line rule. That is the mechanism that would have prevented it, and it is a claim-construction question rather than a code-selection one.

Exercise 9.23 †

What is wrong with it, precisely: the "with" presumption is not a statement about clinical plausibility. It is an instruction attached to specific pairings the classification has already decided about, appearing in a code title, the Alphabetic Index, or a Tabular instructional note. Whether a relationship is clinically plausible is irrelevant to whether the convention applies.

Extending the presumption to pairings the classification has not made is the coder supplying a clinical judgment, which Chapter 4 §4.7 forbids and which no convention authorizes.

The exposure: in a risk-adjustment context, submitting diagnoses the medical record does not support is an active federal audit and enforcement area — OIG audit work, CMS Risk Adjustment Data Validation audits, and Department of Justice matters. The standard applied is whether the record supports the diagnosis, and "a clinician would find it plausible" is not that standard.

The safe formulation to give them: "Did the classification link these two, or did I?"

Exercise 9.25 †

Model case to a practice manager:

The ICD-10-CM Official Guidelines are the rules our coders are legally required to follow, they are free, they are about a hundred pages, and I do not believe anyone here has read them front to back. That is not a criticism of the staff — nobody is given time for it and most coders learn the conventions from the book and the rules from colleagues.

What I would expect one afternoon to change: we would stop coding rule-out diagnoses in the office setting, which I believe we do occasionally. We would sequence more deliberately, which affects medical-necessity denials directly. And we would apply the "with" convention correctly, which matters more every year as our risk-bearing volume grows.

What it costs: four hours of coder time, once, plus an hour each October when the new version comes out. I would like to make the October hour a standing item.

Exercise 9.27 †

B.

Exercise 9.29 †

B — not coded separately.

Exercise 9.31 †

C — code both, acute first.

Exercise 9.33 †

B — outpatient. The emergency department is an outpatient setting for coding purposes when the patient is discharged, regardless of acuity or length of stay.

Exercise 9.34 †

Model answer (114 words):

They look contradictory and they are answering different questions.

In the office, a hedged diagnosis is a guess, and coding it as established puts a disease on someone's permanent record — with real consequences for their future care. You almost always have documented symptoms to code instead, so you code those. Nothing is lost.

In the hospital, a five-day admission spent chasing a diagnosis consumed enormous resources. If the workup ends at "probable" and you code only the symptoms, the record says nothing was determined, and hospital data would systematically understate what hospitals do.

Each setting codes what it actually establishes. The clinic establishes symptoms; the admission establishes a conclusion, however hedged.

Exercise 9.37 †

M25.561 is correct under §9.6 because no definitive diagnosis was established. The note says so explicitly:

"Right knee pain — new complaint this visit. Examination findings are consistent with a degenerative process; no definitive diagnosis established today and no prior imaging of this knee is available."

Where no definitive diagnosis is established, the symptom is coded. This is endorsed by Section IV, it is not a fallback, and it is not a documentation failure.

What would have to be documented for a different code to be correct: a definitive diagnosis stated by the provider — for example, osteoarthritis of the right knee, supported by imaging or by clinical criteria the provider names and applies. Chapter 22 is where that eventually happens, and the resulting code sits in a different block (M15–M19) one block away from where the pain code lives (Chapter 7 §7.2).

Note what would not be enough: the note's own phrase "consistent with a degenerative process." "Consistent with" is on Section IV's list of uncertain-diagnosis terms, and a coder who treats it as a diagnosis has made the exact error §9.5 prohibits.

Exercise 9.39 †

Two distinct questions:

Question 1 — the linkage question. May diabetes and chronic kidney disease be coded as related without an explicit provider statement linking them? Under the "with" convention (§9.7), yes — the Alphabetic Index links them, so the classification presumes the relationship and the presumption is available.

Question 2 — the addressed question. Was the chronic kidney disease addressed, affecting treatment, or requiring management at this encounter? Section IV governs additional diagnoses in the outpatient setting, and the answer is no. The assessment addresses type 2 diabetes, essential hypertension, and hyperlipidemia. The kidney disease appears on the problem list and nowhere in the assessment or plan.

Question 2 is doing the work. A coder who reports E11.22 + N18.31 has answered question 1 correctly and never asked question 2. The linkage convention tells you how to code two conditions if you are coding both; it does not tell you whether to code the second one at this encounter.

E11.9 is therefore correct for March 14.

Exercise 9.40

A code can be correct — accurately describing what this encounter addressed, assigned under the applicable guideline, defensible on audit — and incomplete as a description of the patient, because the patient has a condition that this encounter did not address.

Under fee-for-service, that distinction costs nothing: the claim describes the encounter, the encounter is what was paid for, and the unaddressed condition is irrelevant to the payment.

Under risk-adjusted payment — Medicare Advantage and similar arrangements — it becomes expensive, because the payment model asks a different question: not what did this encounter address but what does this patient's documented burden of illness look like over the year. A condition that exists, is documented, and is never reported on any encounter is invisible to that model.

Chapter 36 owns this, including the MEAT criteria and what the practice should have done.

Chapter 10

Exercise 10.1

(1) Read the chapter-specific guidelines in Section I.C. (2) Read the chapter's opening notes in the Tabular. (3) Skim the block headings. (4) Find the combination codes. (5) Find the sequencing rules. (6) Code the chart, index to Tabular.

Step 1 is skipped most often and is the highest-yield because Section I.C exists precisely where the Cooperating Parties found recurring disputes — reading it first means you meet the answer before you meet the question.

Exercise 10.3 †

The Tabular must instruct it — a "use additional code to identify the infectious agent" note at the category — and the organism must be documented.

Both. Where the organism is not documented, code the infection without it; that is an unspecified code, it is correct, and it is a candidate for a query where the record contains a culture result the provider has not tied to the diagnosis.

Exercise 10.5 †

Sepsis — a systemic infection. Minimum one code: the underlying systemic infection.

Severe sepsis — sepsis with associated acute organ dysfunction. Minimum three codes: the underlying infection, R65.20, and at least one acute organ dysfunction code.

Septic shock — circulatory failure associated with severe sepsis. Minimum three codes: the underlying infection, R65.21, and the organ dysfunction codes.

Exercise 10.7 †

Six columns: malignant primary · malignant secondary · carcinoma in situ · benign · uncertain behavior · unspecified behavior.

Uncertain behavior is a pathological conclusion: the specimen was examined and the pathologist could not classify it as benign or malignant. It is a documented finding.

Unspecified behavior means the documentation does not state the behavior. It is the NOS column.

The distinction: one is the pathologist's uncertainty and one is the record's silence. A coder who uses the uncertain column because they are uncertain has reported a pathological finding nobody made.

Exercise 10.9 †

The malignancy was excised or eradicated; there is no further treatment directed to that site; and there is no evidence of any remaining malignancy at that site.

All three. Conjunctive. A patient on adjuvant therapy fails the second condition and is coded as active.

Exercise 10.11 †

1. Only the conditions the classification links. A condition the Alphabetic Index does not list under "with" is not presumed related, however plausible.
2. Documentation stating they are unrelated defeats it.
3. Where chapter-specific guidance requires an explicitly documented linkage, that governs and the presumption does not override it.

Exercise 10.14 †

1. G89 is not assigned when the definitive underlying diagnosis is known, unless the encounter is for pain management.
2. Where the encounter is for pain control or management, the G89 code is sequenced first, with the underlying condition coded additionally.
3. Where the encounter is for treatment of the underlying condition, code the condition; do not assign G89.
4. Site-specific and G89 codes may be used together, with sequencing determined by the reason for the encounter.

There is no duration rule for chronic pain. The provider's documentation governs.

Exercise 10.15 †

(a) The MRSA sepsis code per the index and Tabular. One code. No severe sepsis code — no organ dysfunction documented.

(b) A41.9 (sepsis, unspecified organism) first, then R65.20 (severe sepsis without septic shock), then the acute respiratory failure code. Three codes — organ dysfunction is documented and documented as secondary to the sepsis.

(c) The sepsis code. Then stop and query. The encephalopathy is documented; it is not documented as associated with the sepsis. Do not assign R65.20 on the strength of two conditions appearing in the same note.

(d) The underlying infection codes for the pneumonia-related sepsis per the index, then R65.21 (severe sepsis with septic shock), then the acute kidney injury code and the acute respiratory failure code. Four or more codes. Both dysfunctions are documented as secondary to the sepsis.

Exercise 10.17 †

What is sequenced first depends on why the patient is there, and the encounter is described as being for management of hypercalcemia — a complication.

What you would need to check: Section I.C.2's guidance on complications of a malignancy. The guidance addresses specific complications and specifies sequencing for several; it is not a single rule. Read it rather than assuming that "the complication is the reason, so the complication is first."

You would also code the primary breast malignancy and the secondary bone site, because metastatic disease requires both.

Exercise 10.19 †

Code type 2 diabetes without complications — E11.9 — by the type-2 default (§10.6), since no type and no complication are documented.

Two things in that sentence that are not codeable as written:

1. "Poorly controlled." The classification does not have a "control" axis. It asks about hyperglycemia and hypoglycemia specifically. "Poorly controlled" is a query candidate if the specific state matters — and note that a query is only appropriate where the answer would change the code.
2. The absent type. It is not an error — the default resolves it — but it is worth noting that the record supported more and did not say it.

Exercise 10.21 †

No, the sole-purpose rule is not satisfied. The encounter included treatment of nausea, so it was not solely for chemotherapy administration.

What follows: Section I.C.2's guidance on complications governs the sequencing rather than the sole-purpose chemotherapy rule. Read it. The general shape is that when the encounter is for management of a complication and not solely for the therapy, the complication may be sequenced first — but the guidance is specific by complication and should be applied rather than generalized.

The teaching point: "solely" is a real word in the guideline and it does work. One additional treated problem defeats the rule.

Exercise 10.23 †

Item 1 — Z85 personal history of malignant neoplasm of the breast, right. All three conditions of §10.5 are met: excised (lumpectomy), no further treatment (radiation completed 2019), no evidence of recurrence. Plus the encounter code for the surveillance imaging.

Item 2 — the new left breast lesion is coded as documented and no further. "Suspicious, biopsy pending" is an uncertain diagnosis in an outpatient setting (Chapter 9 §9.5) — you do not code a malignancy. Code the documented finding: the lesion or mass, from the appropriate category.

Why they are coded differently: the right breast has an established history with all three history conditions satisfied. The left breast has an unresolved finding with no established diagnosis. One patient, two breasts, two entirely different coding situations — and a coder who codes "breast cancer" for this patient has merged them.

Exercise 10.25 †

Code the sepsis. Then query about the acute kidney injury.

The rule: severe sepsis requires acute organ dysfunction documented as associated with the sepsis. Here the AKI appears in the hospital course as a separate statement — "resolved with fluids" — with no documented relationship to the sepsis. It may well have been sepsis-related; it may have been volume depletion from another cause.

What you do not do: assign R65.20 because both conditions are in the same record. That is inference (Chapter 4 §4.7) wearing a clinical costume.

Note also: the AKI is itself reportable as a diagnosis if it meets the criteria for an additional diagnosis in the setting. The query is about the severe sepsis determination, not about whether to code the AKI at all.

Exercise 10.27 †

1. The Tabular instructs it. Where a "use additional code" instruction exists, reporting the additional code is not optional — Chapter 8 §8.6.
2. "It doesn't pay" is a statement about one payment model. Under risk adjustment and in facility settings, status and status-adjacent codes can matter substantially (Chapter 36).
3. It corrupts the record and the data. A patient on long-term therapy whose record never says so is described inaccurately to every downstream user, including the next clinician.
4. It is exactly the omission an audit finds, because it is mechanical and detectable — and a pattern of omitting instructed codes is evidence about the coding process rather than about one claim.

Exercise 10.29 †

Item 6 is not in §10.1's method and is worth adding: knowing in advance what this body system's documentation gaps look like is what turns a slow first chart into a fast fifth one.

Exercise 10.31 †

A — the underlying infection code only.

Exercise 10.33 †

B — the encounter code for antineoplastic chemotherapy.

Exercise 10.35 †

B — type 2.

Exercise 10.37 †

B — the encounter is for pain management rather than for the underlying condition.

Exercise 10.38 †

Model compliant query:

Clarification is requested regarding the assessment for this encounter.

The record documents: · Sepsis, organism unspecified · Acute kidney injury, with creatinine rising from [value] to [value] on hospital day [n] · [Any other documented clinical indicators, quoted from the record]

Based on your clinical judgment, is the acute kidney injury associated with the sepsis? ( ) Yes — acute kidney injury associated with sepsis ( ) No — acute kidney injury due to another cause; please specify ( ) Clinically undetermined ( ) Other: __

Please document your response in the medical record. This query is not intended to suggest any particular response.

Note what it does not do: it does not mention severe sepsis, does not name R65.20, and does not state that the answer affects the DRG. All three would make it leading (Chapter 4 §4.9).

Exercise 10.41 †

E11.9 asserts: type 2 diabetes mellitus, without complications.

It therefore assumes: that no diabetic complication was addressed at this encounter.

Which is true. The assessment addresses the diabetes itself — continues metformin, orders an A1c to reassess control — and addresses no complication. The chronic kidney disease is on the problem list and is not addressed anywhere in the assessment or plan.

Why nothing requires a query: a query is appropriate where documentation is conflicting, ambiguous, incomplete, or clinically inconsistent in a way that affects code assignment (Chapter 4 §4.9). Here the record is clear and complete for what it describes. There is no ambiguity about the diabetes, no missing specificity that the record supports, and no conflict. The record says what it says and the code says the same thing.

(Whether the encounter should have addressed the CKD is a different question, it is not a coding question, and Chapter 36 §36.7 takes it up.)

Exercise 10.43 †

Chart 1 documents type 2 diabetes and stage 3a chronic kidney disease, and both are addressed at the encounter — the medications are being continued for them. So both questions are answered yes: the classification links them under "with" (linkage), and both were addressed (Section IV). The combination code applies, plus the CKD stage code.

Account 10-4471 documents the same two conditions, and the assessment does not address the kidney disease — it appears on the problem list only. So the linkage question is answered yes and the addressed question is answered no. E11.9, and the CKD is not reported for this encounter.

The difference is not clinical and not in the "with" convention. It is in what the assessment says was managed — which is Chapter 9 §9.7's two-question structure, producing different answers because the notes are different.

Chapter 11

Exercise 11.1

Kidney: the relationship is PRESUMED. Hypertension and a condition classifiable to chronic kidney disease are coded with a combination code, and no stated linkage is required. Plus an additional code for the CKD stage.

Heart: the relationship must be STATED or IMPLIED — documented as "due to hypertension" or as "hypertensive." Without it, the two conditions are coded separately.

Exercise 11.3 †

The time rule: an acute myocardial infarction is coded as acute for four weeks (28 days) from onset.

Three states: acute MI (within the 4-week period) · subsequent MI (a new infarction occurring within the 4-week window of a previous one) · old MI (after the acute period, healed, no further care).

The subsequent category applies only to a new infarction during the acute window of the first, and when it is used, both the subsequent and the initial codes are reported, with sequencing depending on the circumstances of the encounter.

Exercise 11.5 †

The acute event — coded from the acute infarction categories.

Sequelae — deficits remaining after the acute phase, coded from the sequelae category with a code identifying each deficit and, where applicable, the dominant or non-dominant side.

Personal history — a patient who had the event and has no residual deficits.

What distinguishes them: whether the acute phase is ongoing, and whether deficits remain.

Exercise 11.7 †

The rule: acute respiratory failure may be sequenced as principal when it is chiefly responsible for the admission; it is a secondary diagnosis when it develops after admission; and where it and another acute condition are both present on admission, the guidance addresses the selection and chapter-specific priority rules elsewhere may govern.

It turns on: why the patient was admitted — Chapter 9 §9.4's "after study" definition applied to a common situation.

It does not turn on: severity. Respiratory failure is frequently the most serious thing present and that is not the test.

Exercise 11.9 †

The rule: pressure ulcers are coded by site and stage, and the stage may be taken from documentation by a clinician other than the provider — a wound care nurse's staging, for example — provided the provider has documented the pressure ulcer itself.

The general form (Chapter 4 §4.3): another clinician may supply a detail; only the provider may supply the diagnosis.

Exercise 11.11 †

No, this is not a transplant complication.

A transplant does not fully restore function, and a patient may have a functioning transplant and chronic kidney disease. The guidance addresses this directly: the CKD is coded, with the transplant status code, and this is not a complication of the transplant.

A transplant complication requires provider documentation that something is wrong with the transplanted organ — and coding one where the patient simply has residual CKD is an error with real consequences in a facility setting.

Exercise 11.13 †

The trimester is determined by the provider's documented weeks of gestation at the time of the encounter.

What does not determine it: the coder's calculation from a due date, the last menstrual period, or the admission date. Additionally, a code identifying the weeks of gestation is reported on most obstetric encounters, and for an admission spanning a trimester boundary the guidance addresses which applies.

Exercise 11.16 †

(a) Hypertension + CKD → the hypertensive chronic kidney disease combination code, plus the code for CKD stage 3. The relationship is presumed; no stated linkage needed. Two codes.

(b) Hypertension + a heart condition, no relationship stated → two separate codes. Code the hypertension, and code the chronic diastolic heart failure with its type and acuity. The combination code does not apply.

(c) "Hypertensive heart disease with chronic systolic heart failure" → the relationship is stated ("hypertensive"), so the hypertensive heart disease combination category applies, plus a code identifying the type of heart failure — because the combination code carries the relationship and not the specificity.

(d) Hypertension + CKD + heart failure documented as hypertensive → the classification provides a combination category for hypertensive heart and chronic kidney disease, plus the heart failure type code, plus the CKD stage code. Read the Tabular instructions at that category; it carries specific direction on the additional codes required.

Exercise 11.18 †

Sequelae of cerebral infarction, with:

• a code identifying the expressive aphasia following cerebral infarction, and
• a code identifying the hemiparesis/hemiplegia following cerebral infarction, specifying the affected side and whether it is dominant or non-dominant.

The patient is right-handed and the deficit is left-sided — so the affected side is the non-dominant side. That is documented right there in the note and it is the specificity most commonly missed.

Not an acute infarction code. The event was three years ago.

Exercise 11.20 †

As written: admitted in acute respiratory failure secondary to a COPD exacerbation, so the respiratory failure was present on admission and is a candidate for principal diagnosis. The determination depends on what, after study, was chiefly responsible for occasioning the admission, and Section I.C.10's guidance on respiratory failure with another acute condition addresses the selection. Read it rather than applying a general instinct.

If the respiratory failure had developed on hospital day 3: it would be a secondary diagnosis, and the COPD exacerbation would be principal. The respiratory failure did not occasion the admission — it occurred during it.

Exercise 11.22 †

Elements required:

1. The obstetric code for gestational diabetes in pregnancy, from chapter 15 — priority over the endocrine chapter.
2. The trimester character reflecting 32 weeks.
3. A code identifying the weeks of gestation.
4. The seventh character identifying the fetus — here, the value for fetus 2, since the condition is documented as affecting fetus 2 in a twin gestation.
5. A code identifying the multiple gestation itself.

What the seventh character does: it identifies which fetus a condition applies to in a multiple gestation. It is not the episode of care — that is chapter 19's meaning — and it is assigned even in a single gestation, using the value for a single gestation or where the character does not apply.

Exercise 11.24 †

All three conditions are addressed, so all three are reportable (Chapter 9 §9.3).

Conventions applied:

1. Hypertension + CKD → relationship presumed (§11.1) → the hypertensive chronic kidney disease combination code.
2. Diabetes + CKD → relationship presumed by the "with" convention (Chapter 10 §10.6) → the diabetes-with-CKD combination code.
3. CKD stage → an additional code for stage 3b, because the combination codes carry the relationship and not the stage.
4. Section IV's addressed question (Chapter 9 §9.3) → all three were addressed, so all are reportable.

Read the Tabular at both combination categories for the required additional codes and any sequencing instruction; both categories carry them.

Exercise 11.26 †

You cannot determine it from what is given, and that is the point of the exercise.

Both sepsis and acute respiratory failure are present on admission. What you need is what, after study, was chiefly responsible for occasioning the admission (Chapter 9 §9.4).

Where the rule is: Section I.C.1's sepsis sequencing guidance and Section I.C.10's respiratory failure guidance both bear on it, and the sepsis guidance carries priority instructions of its own. Read both, and where the record does not establish which condition occasioned the admission, that is a query.

What you may not do: pick the more severe one. Severity is not the test.

Exercise 11.28 †

The investigation: pull twenty charts coded to the unspecified heart failure option and determine, for each, whether the record supported more — checking the encounter note, the echocardiogram reports, and prior documentation.

Three possible findings and what each implies:

The proportions determine the priority, and responding to a documentation problem with coder training addresses the smallest share — which is the most common misdiagnosis in this area.

Exercise 11.30 †

Model compliant query:

Clarification is requested regarding the assessment for this encounter.

The record documents: · Essential hypertension, treated with [medication] · Chronic diastolic heart failure · [Any other documented clinical indicators, quoted from the record]

The relationship between these conditions is not specified in the documentation. Based on your clinical judgment, is the heart failure related to the hypertension? ( ) Yes — hypertensive heart disease with heart failure ( ) No — heart failure due to another cause; please specify ( ) Clinically undetermined ( ) Other: __

Please document your response in the medical record. This query is not intended to suggest any particular response.

Note what it does not do: it does not name a code, does not state the payment consequence, and does not signal a preferred answer. It also asks a real question — the classification genuinely requires a stated or implied relationship here, and the physician genuinely has the answer.

Exercise 11.31 †

B — a combination code, because the relationship is presumed.

Exercise 11.33 †

C — four weeks (28 days).

Exercise 11.35 †

B — a secondary diagnosis.

Exercise 11.37 †

B — chronic kidney disease with a transplant status code, and not a complication.

Exercise 11.39 †

Model answer (104 words):

Hypertension plus kidney disease and hypertension plus heart disease follow different rules, and that is the thing to memorize.

Kidney: the classification assumes the relationship. You use the combination code whether or not anyone wrote a link. Add the stage code.

Heart: somebody has to say so. "Hypertensive," or "due to hypertension." Without it, two separate codes.

Why it is not arbitrary: hypertension and kidney disease travel together closely enough that the classification will assume it. Heart conditions have a lot of other causes, so it will not.

When you see hypertension plus an organ, ask which organ before anything else.

Exercise 11.42 †

Both organ questions, answered:

Heart? No heart condition is documented anywhere in the note. The cardiac examination is documented and normal — regular rate and rhythm, no murmur, no peripheral edema. There is nothing to combine with. And even if there were, §11.1 requires a stated or implied relationship for the heart, which the note does not supply.

Kidney? Chronic kidney disease, stage 3a, is on the problem list, and the hypertension–CKD relationship would be presumed — no stated linkage needed.

Which prior question decides it: Section IV's addressed question (Chapter 9 §9.3). Report additional diagnoses addressed, affecting treatment, or requiring management at this encounter. The assessment addresses hypertension, diabetes, and hyperlipidemia. It does not address the kidney disease.

The presumption in §11.1 tells you how to code hypertension and CKD if you are coding both. It does not tell you whether the CKD belongs on this claim.

Assign I10.

Exercise 11.44 †

The respect in which it is stronger: the diabetes–CKD presumption operates through the general "with" convention (Chapter 9 §9.7), which is a classification-wide mechanism with three stated boundaries. The hypertension–CKD presumption is stated directly in the chapter-specific guidance as a cause-and-effect relationship the classification presumes — and by §9.10's hierarchy, specific beats general. It is the more explicitly and more narrowly stated of the two.

Why the stronger presumption still does not change the answer: because both presumptions answer the linkage question, and Account 10-4471 is decided by the addressed question, which comes first and which neither presumption touches.

That is the point of putting the two side by side. A stronger convention, more explicitly stated, in a different chapter, reaching the same conclusion — because the question that decides this file is not the one either convention answers.

Chapter 12

Exercise 12.1

Chapter 19 asks what happened to the body, plus where in the arc of care. Chapter 20 asks how it happened. Chapter 18 asks what the patient is experiencing when no disease is established. Chapter 21 asks why a person who may not be ill is here.

Three consequences: they frequently require more codes than a body-system chapter would; they carry sequencing rules that override the ordinary ones; and two of them contain codes that may never stand alone.

Exercise 12.3 †

A — the patient is receiving active treatment. D — active treatment is complete and the patient is receiving routine care during healing or recovery. S — the acute phase is over and a residual effect remains.

The character describes the KIND OF CARE. It does not describe the ordinal position of the encounter.

Exercise 12.5 †

Code the residual condition first, then the injury code with the seventh character S.

Why the S code cannot stand alone: it says "this is a leftover from that." It identifies the origin of the residual, not the residual itself. Something has to state what the leftover is — a contracture, a hemiplegia, a chronic pain — and that is the first code's job.

Exercise 12.7 †

Not documented open or closed → CLOSED. Not documented displaced or non-displaced → DISPLACED.

The displaced default runs against intuition, because coders expect defaults to be conservative and "displaced" is the more severe of the two. It is a guideline and it is examined precisely because it surprises people.

Exercise 12.9 †

Depth (first, second, third degree — code the highest degree at each site) · site (with laterality where provided) · extent (percentage of total body surface area, and the percentage that is third degree, reported with a separate code).

Sequencing: the highest-degree burn first, then the other burn sites, then the extent code.

Exercise 12.11 †

Poisoning and adverse effect are inverted relative to each other.

The reason: in a poisoning, the ingestion is the clinical event and the manifestation follows from it. In an adverse effect, the patient presents with a problem and the drug is the explanation for it.

Exercise 12.13 †

Position: never first-listed. Always secondary to the injury or condition they explain.

Frequency: the cause and intent codes are reported as long as the injury is being treated, with seventh characters. Place of occurrence, activity, and status are reported ONCE, at the initial encounter only.

Requirement: ICD-10-CM itself imposes no national requirement for mandatory external cause reporting. Requirements come from state mandates, payer requirements, or the provider's own policy — and for workers' compensation, the work-related status code is frequently not optional.

Exercise 12.15 †

Screening · status · personal history · family history · aftercare · follow-up · observation · counseling and other encounters. (Any six.)

First-listed: when the encounter's reason is not a disease — screening, well visit, aftercare, follow-up, observation. Secondary: when they describe a circumstance affecting care — status codes, history codes.

Exercises 12.18–12.24 †

Exercise 12.25 †

Adverse effect — the drug was taken as directed.

Codes: the rash first, from the main Alphabetic Index. Then the drug code from the adverse effect column of the Table of Drugs and Chemicals, with its seventh character.

Sequence: manifestation first.

Exercise 12.27 †

Underdosing.

Every code required: 1. The underdosing code for insulin, from the underdosing column, with its seventh character 2. The diabetes with hyperglycemia code — the documented exacerbation resulting from the underdosing 3. A code identifying the reason — underdosing due to financial hardship

The one people omit: the reason code. It is required, and it carries the clinically and administratively important information. A patient underdosing because they cannot afford the drug is a different problem from one who forgot, and the classification distinguishes them.

Exercise 12.29 †

Underdosing — the patient took less than prescribed (in fact, none), which is underdosing rather than poisoning or adverse effect.

Codes: the underdosing code for the antihypertensive; the hypertensive emergency as the documented exacerbation; and a reason code — here, intentional underdosing for a reason other than financial hardship, per the categories the classification provides.

The trap: calling this "noncompliance" and reaching for a behavioral code. The classification has underdosing codes with reason codes, and they are more specific and more useful.

Exercise 12.31 †

The screening Z-code for malignant neoplasm of the colon, first-listed. The patient is asymptomatic and the encounter's reason is the screening itself.

Exercise 12.33 †

The kidney transplant status Z-code, reported as a secondary code. The reason for the encounter is the respiratory infection, which is first-listed; the transplant status is a circumstance affecting the patient's care.

Note also (Chapter 11 §11.8) that a functioning transplant with residual CKD is coded as CKD plus the status code, and is not a transplant complication.

Exercise 12.35 †

Codes and reasons:

1. The follow-up examination Z-code — surveillance after treatment has concluded, first-listed. Not aftercare: treatment is complete, not ongoing.
2. The personal history of malignant neoplasm of the colon Z-code — Chapter 10 §10.5's three conditions are met (excised, no further treatment, no evidence remaining).
3. The screening code does not apply — this is surveillance in a patient with a history, not screening of an asymptomatic person with no history. Verify the current guidance, which addresses this distinction.

Exercise 12.37 †

B — the patient is receiving active treatment.

Exercise 12.39 †

B — the residual condition, then the injury code with S.

Exercise 12.41 †

B — manifestation first, then the drug code.

Exercise 12.43 †

B — once, at the initial encounter.

Exercise 12.45 †

B — the acute fracture code with the appropriate seventh character.

Exercise 12.46 †

Model answer (117 words):

A, D, and S are about what kind of care this encounter was — not about which visit it is.

A means active treatment. D means active treatment is done and this is routine healing care. S means the acute phase is over and something is left behind.

Here is the example that breaks everyone's intuition: a patient's first visit to you, three weeks after someone else set their fracture, for a cast check. It is their first visit to you. It is D, because active treatment is complete and you are doing routine healing care.

And a patient seen four times during active treatment has four encounters coded A.

Ask "what kind of care?" — never "which visit?"

Exercise 12.49 †

Exercise 12.51 †

Minimal change: replace "No known injury" with "Onset following a twisting injury while descending stairs six weeks ago."

What changes:

• The chapter. The condition is now a traumatic injury and moves from chapter 13 to chapter 19, to a code for a sprain or internal derangement of the knee — which one depends on what the examination and any imaging support, and the note's ligamentous testing is normal and McMurray equivocal, so a specific structural diagnosis is not established.
• A seventh character is now required. The patient is receiving active treatment — an injection was performed today — so A.
• An external cause code becomes available: the mechanism (a fall or a twisting injury on stairs), the place of occurrence, the activity, and the status — reported once, at this initial encounter, and subject to whether state or payer requirements make them mandatory.

What does not change: the other three diagnoses, and the procedure coding.

The teaching point: one clause, replaced, moves the encounter between two chapters of the classification, adds a required character, and opens a whole category of secondary codes.

Chapter 13

Exercise 13.1

The American Medical Association maintains CPT. The CPT Editorial Panel decides what codes exist, advised by the CPT Advisory Committee. The RUC — the Relative Value Scale Update Committee — recommends relative value units to CMS. Different bodies, different jobs: the Panel decides what the codes are; the RUC recommends what they are worth.

Exercise 13.3 †

1. A current professional edition costs money every year, which is a real barrier for a student. A prior year's edition is a legitimate way to learn the structure and must never be used to bill.
2. Software containing CPT is licensed — encoders, practice management systems, and clearinghouses all pay for it, and it is part of what you are buying.
3. Textbooks and internal materials may not reproduce the code set. Individual codes and paraphrased descriptors for teaching are one thing; reproducing descriptor runs, sections, or building internal cheat sheets from them is governed by the license.

Exercise 13.5 †

The rule: if a Category III code exists that describes the service, it must be used instead of an unlisted Category I code.

The reason: Category III codes are how the code set collects utilization data on a new service. If everyone reported unlisted codes instead, no data would accumulate, and the service could never build the evidence needed to become a Category I code. Using the Category III code is the mechanism by which a new procedure eventually earns a permanent one.

Exercise 13.7 †

Four kinds of content: definitions of terms used throughout the section; what the codes include (the surgical package being the most consequential example); reporting rules on what may and may not be reported separately; and modifier guidance. Also: unlisted code and special report requirements, and the "separate procedure" designation.

Exercise 13.9 †

The most dangerous is ▲. A revised code produces no rejection: the number survives, the meaning changes, the claim pays, and you have billed a service that was not furnished.

Exercise 13.11 †

Three add-on rules: never reported alone; exempt from modifier 51; permitted primary procedures specified in a parenthetical beneath the code.

The one-way relationship: all add-on codes are modifier-51 exempt, but not all modifier-51-exempt codes are add-on codes. They are two different appendix lists, and a code can appear on the exempt list without being an add-on code.

Exercise 13.13 †

Three rules: use only when nothing else fits — including any applicable Category III code; a special report must accompany it; and it carries no assigned relative value, so the payer must price it individually.

The special report must contain, per CPT's guidelines: a description of the nature, extent, and need for the procedure, together with the time, effort, and equipment necessary. Some sections also address complexity of symptoms, final diagnosis, concurrent problems, and follow-up care.

Exercise 13.18 †

(Answers will vary by edition — the point is what you record.) You should have captured: the complete descriptor including everything before the semicolon; at least two parentheticals — one directing to 20611 when ultrasound guidance is performed, and one prohibiting reporting 20610 and 20611 together for the same joint; and any symbol in the margin.

If you recorded only the descriptor, you did the thing this chapter warns against.

Exercise 13.20 †

(Answers vary.) You should have recorded the + symbol, the descriptor, and — critically — the parenthetical naming the primary procedures the add-on code may accompany. That parenthetical is the thing that makes the code usable, and it is directly beneath the code where it is easy to skip.

Exercise 13.22 †

(Answers vary.) The complete descriptor of the third indented code is everything before the semicolon in the parent code, plus the indented text. If what you wrote begins with a semicolon or reads as a fragment, you have reproduced the error §13.10 describes.

Exercise 13.24 †

Report the Category III code.

What would be wrong with the alternative: an unlisted Category I code is less specific, the guidance is explicit that the Category III code governs where one exists, and — the systemic reason — reporting the unlisted code contributes nothing to the utilization data that would let the service eventually earn a permanent Category I code.

Exercise 13.26 †

No, this is not correct.

An add-on code's permitted primary procedures are specified in a parenthetical directly beneath it. An add-on code paired with a primary that is not on that list has been reported outside its intended use.

What you would check: the parenthetical beneath the add-on code, to see which primaries it may accompany; and then the operative report, to determine whether the procedure actually performed corresponds to one of them. The likeliest explanations are that the primary was coded incorrectly, or that the add-on code is the wrong one for this primary.

Exercise 13.28 †

The error: a code was reported describing ultrasound guidance that the procedure note says was not performed. The claim asserts a service that was not furnished.

The cause: the semicolon convention. The coder read the indented portion — "; with ultrasound guidance" — which fit the code family they were looking at, and did not read the common portion above it or, more importantly, did not check the guidance question against the note before choosing between the two codes.

This is §13.10's stated most-common cause of a descriptor that did not match the service.

Exercise 13.30 †

Report the unlisted procedure code for the appropriate section — generally the code ending in 99.

Alongside it you must produce a special report containing a description of the nature, extent, and need for the procedure, together with the time, effort, and equipment involved.

And understand what happens next: the code carries no assigned relative value, so the payer will price it individually — usually by comparison to a similar coded service — using your special report to do so. A thin special report produces a low payment or a denial, which is why the report is the work rather than an afterthought.

Exercise 13.32 †

The order of operations:

1. The section and subsection guidelines — front of the section. Ninety seconds.
2. The parentheticals at and around the code.
3. CPT Assistant, if your organization subscribes — the recognized source of official interpretation.
4. The NCCI Policy Manual, if the question is about whether two codes may be reported together — it is free and it explains the reasoning.
5. The payer's published policy, if the question is coverage rather than coding.
6. Then colleagues and forums — useful for orientation, never authority, and follow every answer to its source.

Why it is faster as well as more reliable: the guidelines are four pages away and searching is twenty minutes. The habit pays for itself on frequency alone, before any argument about accuracy.

Exercise 13.34 †

1. Accuracy. Reporting the closest coded service means reporting a code whose descriptor does not describe what was done. That is inaccurate on its face.
2. Compliance. A claim asserts that the service described by the code's current descriptor was furnished (Chapter 5 §5.1, and Chapter 13 Case Study 2's "the descriptor is the claim"). Reporting a code because it pays better than the accurate one is a false claim, not an aggressive interpretation.
3. The coverage problem is not solved by coding. If the unlisted code is slow and underpaid, the remedies are prior authorization, a patient financial conversation, a better special report, and appeal — all of which address the actual problem. Substituting a code is the route from a hard case to a false claim, and it is the single most common one.

Exercise 13.35 †

C — Category III.

Exercise 13.37 †

C — an add-on code.

Exercise 13.39 †

B — never reported alone, and exempt from modifier 51.

Exercise 13.41 †

C — Evaluation and Management.

Exercise 13.43 †

B — everything before the semicolon in the code above it.

Exercise 13.44 †

Model answer (116 words):

The guidelines are at the front of each section, they govern every code beneath them, and the index will never take you to them — which is exactly why nobody reads them.

Here is a question they answer. A surgeon performs a procedure and sees the patient twice afterward. Are those visits billable?

The Surgery guidelines define the surgical package: what the procedure's payment already includes. The answer is in there, in a few paragraphs, governing thousands of codes.

Most people who use CPT daily have never read that page. It takes twenty minutes.

When you have a CPT question, go to the front of the section before you search anything. You will find the answer often enough that the habit pays for itself.

Exercise 13.47 †

The most surprising is 36415 — a venipuncture in the Surgery section.

Why it is there: the Surgery section is where the code set files procedures performed on the body's structures, organized by body system. A venipuncture is a procedure on a vein, so it sits under the cardiovascular system. "Surgery" in CPT is not the lay meaning of the word, and reasoning from the lay meaning is how coders end up searching the wrong section.

(A close second: 20610, a joint injection, also in Surgery, for the same reason.)

Exercise 13.49 †

The two documented negatives:

1. "No known injury" (Chapter 12) — decides that the knee pain is not an injury, which keeps the code in ICD-10-CM chapter 13 rather than chapter 19, requires no seventh character, and forecloses external cause coding.
2. "No imaging guidance used" (this chapter) — decides between 20610 and 20611, two CPT codes distinguished by exactly that variable.

Why a negative finding is unusual: clinical documentation is overwhelmingly a record of what was found and what was done. Writing down what was not found, or what was not used, takes deliberate effort and produces no clinical benefit to the writer — the physician knows they did not use ultrasound.

Which is why both clauses are worth noticing. Each is a physician recording an absence, and each one settles a coding question that would otherwise require an inference a coder is not permitted to make (Chapter 4 §4.7).

Exercise 13.50 †

What a coder may conclude: nothing about whether guidance was used.

What a coder may not do: assume that silence means it was not used. That is inference (Chapter 4 §4.7), and it happens to point toward the code the practice would probably prefer, which makes it worse rather than better.

What I would do: first, read the rest of the encounter's documentation — an order, a procedure log, an imaging entry — because §7.9's thirty-second search applies to procedure coding as well. If nothing settles it, query: a short, non-leading question asking the provider to document whether imaging guidance was used and, if so, whether it was permanently recorded.

Note the second half of that question. The descriptor for the guidance code requires permanent recording and reporting, so "we used ultrasound" alone does not settle it either. The query has to ask for both elements, which is the kind of detail that comes from reading the full descriptor rather than the indented portion.

Chapter 14 — Answer Key

Quiz (24 questions)

1. C — A modifier reports that a service was altered by a specific circumstance without changing the code's definition. It does not change what the code means (A), does not substitute for a code (B), and is not optional documentation (D).
2. B — Payment modifiers are sequenced before informational modifiers, subject to payer policy.
3. D — Modifier 99 signals that more modifiers apply than the claim form's four positions can hold.
4. A — Modifier 25 is appended to the E/M code, not the procedure code. This is the single most common mechanical error with modifier 25.
5. C — False. A different diagnosis is not required. The requirement is that the E/M be significant and separately identifiable — above and beyond the usual pre- and post-procedure work.
6. B — Modifier 25 applies to minor procedures (000- and 010-day global periods). Modifier 57 applies to the decision for major surgery (090-day).
7. D — Prescription drug management for an unrelated condition supports separability. Positioning the patient (A), obtaining consent (B), and post-procedure instructions (C) are all included in the procedure's payment.
8. A — Modifier 59 identifies a distinct procedural service and is used to override a bundling edit. It is a last resort.
9. C — XS: a separate structure. XE is a separate encounter, XP a separate practitioner, XU an unusual non-overlapping service.
10. B — Modifier 59 is scrutinized because it is the only modifier whose sole function is to defeat a control, it is applied by the party that benefits, and its use is measurable from claims data without any chart.
11. D — Modifier 51 asks for less money (it triggers the multiple-procedure reduction); modifier 59 asks for more (it overrides a bundling edit). This is the fastest way to keep them straight.
12. A — Never append modifier 51 to add-on codes or to modifier-51-exempt codes. Add-on codes are already valued as additional procedures.
13. C — Modifier 26 reports the professional component: the interpretation and the written report. No written report, no professional component.
14. B — Ownership of the equipment determines who bills the technical component, not the physical location where the service was performed.
15. D — All three: billed twice, billed by nobody, and billed by the wrong party are the three failure modes of component billing.
16. A — The bilateral reporting convention varies by payer: one line/one unit, one line/two units, or two lines with RT and LT. Reporting one way for all payers produces silent underpayment.
17. C — Modifier 24 reports an unrelated E/M during a postoperative period.
18. B — Modifier 58 is for a planned or staged related procedure. Modifier 78 is for an unplanned return to the operating room.
19. D — Modifier 78 generally pays only the intraoperative portion and does not restart the global period; modifier 58 generally pays in full and does start a new global period.
20. A — Modifier 79 reports an unrelated procedure performed during another procedure's postoperative period.
21. C — Modifier 22 requires documentation and a special report and triggers manual review. It is not an automatic payment increase.
22. B — Modifier 53 reports a procedure discontinued after induction because continuing threatened the patient's well-being. Modifier 52 reports services reduced at the physician's discretion. (73/74 are the ASC and outpatient hospital equivalents.)
23. D — Modifier 91 is for a repeat lab test performed to obtain subsequent results. It is not for repeats due to equipment failure or specimen problems.
24. A — GZ. An expected denial with no ABN obtained. The patient may not be billed. GA (ABN obtained) means the patient may be billed.

Exercises (54 items) — selected answers and grading notes

Items 1–10 (modifier identification). Straight recall from §14.4–§14.11. Accept the modifier and require, for full credit, a one-sentence statement of what the modifier asserts. A student who can produce the number but not the assertion has memorized a list, which §14.1 explicitly warns against.

Items 11–18 (modifier 25 application). For each scenario, the student must (a) decide whether 25 applies and (b) quote the specific documentation element that supports the decision. Scenarios 12, 15, and 17 do not support modifier 25 — 12 restates the procedure's indication, 15 documents positioning and consent only, 17 examines the procedure site alone. A student who applies 25 to all eight has learned the wrong lesson and should redo the item set.

Items 19–24 (25 vs. 57). Decided entirely by the global period of the procedure: 000/010 → 25; 090 → 57. Students should be looking up the global period, not guessing. The Medicare Physician Fee Schedule relative value file carries it in a column.

Items 25–32 (59 and X{EPSU}). For each, the student must name the more specific modifier if one exists before defaulting to 59. Items 26 (separate encounter → XE), 28 (separate structure → XS or an anatomic modifier), and 31 (separate practitioner → XP) each have a better answer than 59. Item 30 has no more specific alternative and 59 or XU is correct.

Items 33–38 (51 vs. 59). Answered by asking which direction the money moves. Item 35 is a trap: an add-on code, where neither applies — 51 is prohibited on add-on codes and there is no edit to override.

Items 39–44 (component and laterality). Items 41 and 42 turn on ownership rather than location; item 43 requires the student to name all three bilateral conventions and state that the payer's policy decides.

Items 45–50 (global period set). A decision-tree exercise. The dividing question for 58 vs. 78 is planned or not, and students should say so explicitly.

Items 51–54 (liability modifiers). Item 53 is the important one: no ABN, expected denial → GZ, and the patient may not be billed. Students frequently answer GA because it feels safer; it is not, and reporting GA without an ABN is a false statement.

The Encounter checkpoint — Account 10-4471

Question 1 (open since Chapter 4): Was modifier 25 correctly applied to line 1?

Yes.

The supporting documentation in Figure 4.2, all of it independent of the knee:

• Three chronic conditions individually assessed with plans stated (type 2 diabetes, essential hypertension, hyperlipidemia)
• Prescription drug management
• Two tests ordered with stated reasons
• A new problem (the knee) evaluated on its own merits, which is itself work above the injection's inherent pre-service evaluation

And 20610 carries a 000-day global period, which makes it a minor procedure — so modifier 25 is the correct modifier and 57 is not.

Two qualifications students should be able to state:

1. The payer denies the line on day 17 anyway (CO-97/N19). That is a payer policy outcome, not a coding error, and the distinction matters — a coder who "fixes" a correct claim to avoid a denial has made the claim wrong.
2. The note never states that the decision to inject was made during this visit. It is strongly implied by the sequence, but it is not written. This is why the Chapter 30 appeal must construct the argument from the note's content rather than quote a single sentence — and it is a documentation improvement opportunity, not a coding error.

Grading note: full credit requires both the answer and at least two of the four supporting elements, correctly identified as independent of the knee. A student who answers "yes, because there were other diagnoses" has reproduced the myth §14.4 exists to correct and should not receive full credit.

Chapter 15 — Answer Key

Quiz (26 questions)

1. C — the cognitive work of the reporting professional, by MDM or by total time.
2. C — not used for level selection, but a medically appropriate history and/or examination is still required.
3. B — 99201, deleted effective January 1, 2021.
4. B — New. Three years to the day; three years and one day is outside the window.
5. C — Established. Any professional service within three years counts, in any setting.
6. B — two of the three elements must meet or exceed the level.
7. C — Low (99213). No level is met by two elements at moderate or above. Working down: problems (high) exceeds low and risk (low) meets low → two elements at low or above → low MDM.
8. B — at the treatment goal.
9. B — not stable, because it is not at treatment goal. This pushes toward the chronic-illness-with-exacerbation-or-progression language, which is moderate.
10. C — moderate.
11. C — not addressed. Notation of a problem managed by another without additional assessment or care coordination.
12. A — one unique test. A panel is one test regardless of analytes.
13. B — one item. Review of the result is included in the order.
14. B — a different group practice, or a different specialty or subspecialty.
15. C — may not be counted. Bill it or count it; not both.
16. C — a documented interactive discussion with an external professional, not separately reported.
17. C — count, if documented. The risk element explicitly includes options considered but not selected.
18. C — moderate.
19. B — the assessment-and-plan entry. A medication list is an inventory; management is a decision.
20. C — the reporting professional's own non-face-to-face time on that calendar date.
21. B — 28 minutes. Time performing a separately reported service is excluded. (An established patient at 28 minutes is a 99213 by time — which is why the question is asked.)
22. B — 99214. The two methods are alternatives; documenting time does not obligate you to use it, and time never caps an MDM-based level.
23. C — 99205 and 99215 only. The highest level's time must be fully met first.
24. B — Medicare uses G2212, with a different starting threshold.
25. C — the physician must provide direct supervision (present in the office suite and immediately available), not be physically present in the examination room.
26. B — may not be billed incident-to. The new rash is a new problem, which disqualifies the encounter; it must be billed under the NPP's own NPI at 85%.

Exercises

Section A — New versus established

A.1 New. A.2 Established — within three years. A.3 Established. Any professional service counts, including hospital services. A.4 New — four years exceeds the window. A.5 New to the dermatologist. Different specialty, even in the same group. A.6 Established. Same specialty, same group. A.7 New. Different group practice, different tax identification number. A.8 New. An interpretation without a face-to-face encounter generally does not establish the patient. (Grading note: accept a well-reasoned "verify with the payer" as partial credit — this is the item where the CPT rule and individual payer determinations most often diverge, and §15.2's 📞 On the Phone callout is about that call.)

Section B — Problems addressed

B.9 Low. B.10 Moderate — the threshold is two. B.11 Moderate — three exceeds two but does not reach high. B.12 Moderate. Not stable (not at goal), and the medication was increased: a chronic illness with progression or exacerbation. B.13 Straightforward. B.14 Low. B.15 Moderate — one undiagnosed new problem with uncertain prognosis. Students who answer "low, it's only one problem" have misread the grid; this is the most underused entry in the element. B.16 Moderate — acute illness with systemic symptoms. B.17 Arguable, at best low. A blanket statement with no individual status and no individual plan is very thin evidence of problems addressed. (This is Reading 2 in §15.10. Full credit requires naming what is missing: individual status and individual plan.) B.18 Not addressed. Contributes nothing.

Section C — Data

C.19 1 item → minimal. C.20 2 items → limited (low). C.21 3 items → moderate. C.22 1 item → minimal. A panel is one test. C.23 1 item → minimal. The prior panel is the same CPT code — not unique — and review is included in the order regardless. C.24 1 order + 2 unique external notes from 2 unique sources = 3 items → moderate. C.25 1 item → minimal. The partner's note is not external — same group, same specialty. C.26 Limited (low) via Category 2 alone. C.27 Nothing. Separately reported with modifier 26; it may not also be counted. C.28 Category 1: 1 order + 1 external note = 2 items. Category 3: documented discussion with an external professional, not separately reported. Two categories satisfied → extensive (high).

Section D — Risk

D.29 Minimal. D.30 Low. D.31 Moderate — prescription drug management. D.32 Not prescription drug management. A list is not a decision; this contributes nothing to the risk element on its own. D.33 Low — minor surgery with no identified risk factors. D.34 Moderate — minor surgery with identified patient risk factors, documented. D.35 High — decision regarding hospitalization, considered and not selected, documented. D.36 Moderate — diagnosis or treatment significantly limited by social determinants of health, documented and shaping the plan.

Section E — Time

E.37 33 minutes (25 + 8, both on the date, both the physician's). Established → 99214. E.38 15 minutes. Staff time never counts. E.39 28 minutes → 99213. E.40 28 minutes → 99213. E.41 99214 (30–39). Under pre-2021 rules, time could be used only if more than half the encounter was counseling or coordination of care — here 20 of 35 minutes is more than half, so it would also have qualified; the difference is that today no such test applies at all. E.42 New patient, 47 minutes → 99204 (45–59). E.43 99213. 29 minutes is inside 20–29. No rounding. E.44 99214. MDM supports it; the two methods are alternatives and time does not cap an MDM level.

Section F — Prolonged, split/shared, incident-to

F.45 58 minutes established: 99215 requires 40–54. 58 exceeds 54 but a complete additional 15-minute increment beyond the 99215 threshold has not accrued. Report 99215 alone. (Grading note: the point of this item is that "over the range" is not the test — the test is a complete additional increment. Accept full credit only if the student says so.) F.46 Medicare uses G2212 instead of 99417, and its threshold starts later still — so the answer is unchanged here, but the code would differ if it applied. F.47 No. 38 minutes does not even reach 99215's 40-minute threshold; prolonged services attach only to the highest level. F.48 Yes, provided the remaining conditions are met — established patient, established plans of care, direct supervision, no new problems. F.49 No. The rash is a new problem. Bill under the NPP's own NPI at 85% rather than 100%. F.50 An overpayment, accruing on every encounter where an established patient raises something new. Direction: the practice is paid more than it was entitled to. Chapter 5 §5.8's sixty-day rule attaches once it is identified. It has no financial signal — the claims pay.

Section G — Integration

G.51 (This is Account 10-4471.) Problems moderate (3 stable chronic illnesses; also 1 undiagnosed new problem with uncertain prognosis). Data limited/low (2 unique tests ordered). Risk moderate (prescription drug management). Two of three at moderate → 99214. Single change that would move it: one more Category 1 item would make data moderate too — which would not change the code, since the level is already moderate. The change that would move it DOWN is removing the individual assessments (Reading 2). To move it up would require a high element in two places — e.g., a documented decision regarding hospitalization plus a high problems element.

G.52 Problems low, data minimal, risk moderate. Two of three at low → 99213 by MDM. But 34 minutes documented, established → 99214 by time. Report 99214. Single change: remove the documented time and it is a 99213.

G.53 New patient. Problems moderate (undiagnosed new problem with uncertain prognosis). Data moderate (3 unique tests). Risk moderate (prescription drug management). Three of three at moderate → 99204. Single change: any two elements at high would make it 99205.

G.54 Problems moderate (chronic illness with exacerbation — worsening symptoms, dose increased). Data moderate (2 orders + 1 external note = 3 Category 1 items). Risk HIGH (decision regarding hospitalization, considered and declined, documented). Two of three at moderate → 99214. Single change: if the problems element reached high — e.g., documented as a severe exacerbation, or as posing a threat to life or bodily function — two elements would be high and the visit would be a 99215. This item exists to show that a single high element gets you nothing, which students find genuinely surprising.

G.55 Problems straightforward, data minimal, risk low. Two of three at straightforward → 99212.

G.56 Problems at best low (blanket statement, no individual status or plan). Data limited/low. Risk moderate at most, if the refills are documented as decisions. Two of three at low → 99213. Single change: individual status and plan per condition → problems moderate → 99214. One sentence per problem.

Section H — Integration with the rest of the book

H.57 In Reading 4 the entire visit is the evaluation leading to the injection. Chapter 14 §14.4's test is whether the E/M is significant and separately identifiable — above and beyond the usual pre- and post-procedure work. With no work independent of the knee, there is nothing above and beyond. Note that the different-diagnosis question never arises; the diagnosis is irrelevant in both directions.

H.58 Expected shape: "I can't do that. A total time in the record is a factual statement offered to a payer in support of payment, and stating a time nobody measured is exactly what §5.3 calls reckless disregard. If the visits really do run 40 minutes, document the actual time on each one and we'll use it — that's the road the rules give us, and it's a better position than an estimate." Grade for: identifying the statement as factual, naming the standard, and offering the legitimate alternative. A response that simply refuses gets partial credit.

H.59 It appears because the physician is documenting a fact about the encounter that determines which selection method the coder may use. It removes the time road and forces MDM — and in doing so it removes ambiguity. A note that is silent about time is not the same as a note that says time was not used, and the second is more useful to the coder and to a reviewer. (Accept students who note that this is unusual and that most notes are silent; the point is what the sentence accomplishes.)

H.60 Expected shape: a message that describes the structure of the assessment rather than asking for content — "when each condition has its own line with a status and a plan, the note reflects the work you already did; a blanket 'chronic conditions stable' doesn't." Grade hard for the line Chapter 5 §5.6 draws: the message must not ask the physician to add anything that did not happen. A message that says "please add more detail so we can bill 99214" fails.

The Encounter checkpoint — §15.13

Account 10-4471, March 14, established patient, is a 99214.

Two of three at moderate → moderate MDM → 99214.

Time is unavailable — the note states "Time was not used for level selection on this encounter."

The CKD problem-list entry is not addressed and contributes nothing. (Do not let students code or discuss a diabetes–CKD relationship here. Chapter 36 owns it.)

Grading note: full credit requires the level, all three element scores, and an explicit statement that the low data element does not reduce the level. Students who write "data is only low so it's a 99213" have made the error the two-of-three rule exists to prevent, and it is worth correcting individually.

Chapter 16 — Answer Key

Quiz (26 questions)

1. C — the same MDM framework introduced for office visits in 2021, extended in 2023.
2. B — two claims, professional and facility, with two patient balances.
3. B — the first face-to-face service of the stay by that professional or their same-specialty group partner.
4. B — initial care. "Initial" is the consultant's first service, not the admission.
5. C — an initial hospital care service only; the office work rolls into it.
6. B — an outpatient service.
7. B — the physician's documented expectation at the time of the decision.
8. C — generally does not apply. Observation days do not count toward the three-day inpatient requirement.
9. B — only before discharge, following utilization review with physician concurrence.
10. A — once per stay, by the attending, for the date of the actual discharge.
11. B — documentation of the time.
12. B — permissible when each service is reasonable and necessary and the record shows what each professional managed.
13. B — a denial of one of the two claims, which is defensible. A reviewer reading two identical assessments cannot tell what the second professional contributed.
14. B — a specialty enrollment problem. Same-specialty determination is made by how the professionals are enrolled, not by what they practice.
15. B — request, render, report.
16. B — Medicare has not recognized them since 2010; report the setting-appropriate E/M instead.
17. B — still a consultation if the three Rs are met. Initiating treatment is explicitly permitted.
18. C — neither a new/established distinction nor a time option.
19. B — the medical decision making documented, including what was ruled out.
20. B — a critically ill or injured patient and high-complexity decision making, regardless of location.
21. C — the appropriate E/M service for the setting. Under 30 minutes is not critical care and there is no partial 99291.
22. B — pulse oximetry.
23. B — may be reported with modifier 25 on the E/M when the documentation shows the sequence.
24. C — the facility's own written criteria, based on resources consumed.
25. B — packaging. Not a denial, and working it as one wastes substantial time.
26. B — they were not addressed by the emergency physician. Chapter 15 §15.5's definition.

Exercises

Section A — Initial versus subsequent

A.1 Initial hospital inpatient or observation care (99221–99223). First service of the stay by that professional. A.2 Subsequent (99231–99233). A.3 Subsequent. Same group, same specialty — the group has already provided the initial service. (This is the weekend-handoff error in §16.2's ⚠️ Where Claims Die.) A.4 Initial. Different specialty; it is the cardiologist's first service. A.5 Subsequent. Same group, same specialty as the cardiologist who saw the patient Wednesday. A.6 Initial. Different specialty again. A.7 Initial hospital care only. The office visit rolls into it and may raise its level. A.8 The emergency physician reports an ED visit; the hospitalist reports initial hospital inpatient or observation care. Different professionals, different services, both reportable. The roll-in rule applies to the same professional.

Section B — Observation and status

B.9 Observation is a hospital service that is outpatient in status, regardless of bed location or duration. B.10 Care expected to span at least two midnights generally supports inpatient admission. Applied prospectively — to the expectation at the decision point. B.11 Yes, appropriate. The benchmark is expectation-based; an unexpected improvement does not retroactively invalidate a documented expectation. B.12 The expectation and its basis are not documented. At risk: the inpatient status itself, and therefore the difference between inpatient and outpatient payment — plus the ability to defend the determination at all. B.13 Skilled nursing facility coverage generally does not apply, because the qualifying stay must be three consecutive inpatient days and observation days do not count. B.14 Under outpatient status, self-administered drugs are frequently not covered, so the hospital's administration of her home medications is billed to her at hospital pricing. B.15 Condition Code 44. Requires the determination before discharge, physician concurrence, and documentation. B.16 Condition Code 44 is unavailable after discharge; a different self-audit process applies, and the window for the first mechanism has closed.

Section C — Discharge day management

C.17 99238. Everything described is consistent with more than 30 minutes and none of it states it. A reviewer does not estimate. C.18 99239. One sentence. C.19 Thursday — the date of the actual discharge. C.20 No. Only the attending performing the discharge reports it, once per stay. The consultant reports a subsequent care service. C.21–C.24 (see Section D)

Section D — Concurrent care

D.21 Permissible. Requirement: each service reasonable and necessary, with the record showing what each professional was managing. D.22 One of the two claims will likely deny, and the denial is defensible — the reviewer cannot tell what the cardiologist contributed. D.23 Enrollment. Whether two professionals are "the same specialty" is determined by how they are enrolled with the payer, not by what they practice. Chapter 25. D.24 The diagnosis pointers. Different pointers to different diagnoses are the fastest signal a payer's system has that two same-date services are distinct.

Section E — Consultations

E.25 Yes — all three Rs. E.26 No — no request; the patient self-referred. E.27 No — no written report back. E.28 Yes — initiating treatment is permitted and does not convert it. E.29 No — that is a transfer of care; report an ordinary E/M. E.30 The setting-appropriate E/M — an office visit or hospital care code. E.31 99244. E.32 The request and the report fail most often. A missing request looks like a self-referral or a scheduled appointment with no documented origin; a missing report looks like a visit with no correspondence in the chart.

Section F — Emergency department

F.33 No new/established — the department serves anyone at any hour and has no ongoing patients in the relevant sense. No time option — ED work is interleaved by design, so total time on the date is not a meaningful measure for one patient. F.34 No. The medical decision making documented, including what was ruled out. F.35 High — a decision regarding hospitalization, considered and not selected, documented. Chapter 15 §15.7 counts options considered but not selected. F.36 Problems moderate (undiagnosed new problem with uncertain prognosis), data minimal (one unique test), risk moderate (prescription drug management). Two of three at moderate → 99284. F.37 Risk falls to low; only one element reaches moderate; two of three at low → 99283. F.38 99281; its office analogue is 99211.

Section G — Critical care

G.39 No. Location does not make care critical; the patient is not critically ill. G.40 Yes, if the patient is critically ill and the work is high-complexity. G.41 Not critical care. Report the appropriate E/M for the setting. G.42 95 − 20 = 75 minutes. 99291 covers 30–74. The remaining 1 minute is not a full additional 30. Report 99291 and the central line. (Verify against any payer-published time-to-units table.) G.43 The pulse oximetry line denies as bundled; it is on the critical care inclusion list and is a standing edit at most payers. G.44 Yes, with modifier 25 on the E/M, provided the documentation shows the sequence — an evaluation when the patient did not require critical care, then deterioration, then critical care.

Section H — The two claims

H.45 Professional: CMS-1500 / 837P. Facility: UB-04 / 837I. H.46 The professional level from medical decision making; the facility level from the facility's own written acuity criteria based on resources consumed. Independent determinations. H.47 That the facility is likely not applying its own criteria — it is copying the physician's level. It is itself a finding. H.48 Written · consistently applied · resource-based · reproducible · auditable. Auditable is the practical test, because a facility whose criteria live in someone's head or in a nine-year-old file cannot demonstrate any of the others. H.49 Not a denial — packaging. Payment is included in the primary service. Do not work it as a denial. H.50 A revenue code says where — which department or cost center. A CPT code says what. H.51 Provider-based billing. Consequence: two claims and generally higher patient cost-sharing for the same service in the same building. H.52 Expected shape: "You had one visit, but two organizations provided part of it. The physician bill covers the doctor's own work; the hospital bill covers the room, nursing, supplies, and equipment. Both went to your plan, and your benefits were applied to each separately." The sentence not to say: "That's just how it works."

Section I — Integration

I.53 The rule is Chapter 15 §15.5's: a problem is addressed when it is evaluated or treated at the encounter by the professional reporting the service, and notation of a problem managed by someone else, without additional assessment or care coordination, is not addressed. The emergency physician did not assess, manage, or plan for the diabetes, hypertension, or hyperlipidemia. I.54 The prescription. It moves the risk element from low to moderate, giving two elements at moderate. I.55 Claims 1 → 2; allowed \$216.28 → \$1,023.60; patient \$47.58 → \$204.72; knee treated yes → no. One sentence: the ED encounter costs roughly five times as much, does not treat the problem, and the office visit still has to happen. I.56 The argument is that site of service is one of the largest determinants of cost, and that it is decided by circumstance far more often than by choice. Plan-design features that exist because of it: urgent care benefit tiers, nurse triage lines, after-hours access requirements, telehealth benefits. I.57 Modifier 25. Documentation must show the sequence — an evaluation at a time when the patient did not require critical care, then deterioration. Two notes describing one continuous episode do not qualify. I.58 Part B. Two consequences: self-administered drugs frequently not covered, and observation days not counting toward the skilled nursing facility three-day inpatient requirement.

The Encounter checkpoint — §16.10

The counterfactual: Account 10-4471's patient, same knee, emergency department, Sunday.

Professional claim: problems moderate (1 undiagnosed new problem with uncertain prognosis) · data minimal (one unique test — the knee radiograph) · risk moderate (prescription drug management). Two of three at moderate → 99284. (99283 if no prescription is written.)

The three chronic conditions score NOTHING. The emergency physician did not address them.

The money, both claims: charges \$2,897.00** · allowed **\$1,023.60 · patient \$204.72 · plan \$818.88**. Against the office encounter's **\$216.28 allowed and \$47.58 patient.

And the knee is not injected — the office encounter still has to happen, bringing the total to \$1,239.88.

Grading note: full credit requires the level, the reason the chronic conditions score nothing, and the observation that the ED visit is additive, not substitutive. A student who concludes that "the patient should have gone to the office" has missed the chapter's stated point — it was a Sunday, the office was closed, and the argument is about plan design and site-of-service economics, not about the patient's judgment. Correct that reading explicitly if it appears; it will.

Chapter 17 — Answer Key

Quiz (26 questions)

1. C — the visit at which the decision for surgery was made is excluded.
2. B — writing off the decision-for-surgery visit. Nothing denies, because nothing is submitted.
3. B — a minor procedure with no postoperative days.
4. B — one preoperative day, the day of surgery, and 90 days after.
5. B — an add-on code, included in another code's global period.
6. C — the global period indicator. 000/010 minor, 090 major. A lookup, not a judgment.
7. B — the body governs, and you query.
8. C — 2.6 cm. 0.4 + 1.8 + 0.4.
9. B — systematically undersizes, because tissue shrinks in formalin. The error is invisible and permanent.
10. B — the repair.
11. B — coded separately, each with its own measurement.
12. B — layered closure, or single-layer closure of a heavily contaminated wound requiring extensive cleaning.
13. A — simple is included; intermediate and complex are separately reportable.
14. B — reported separately; at intermediate complexity the trunk and the hand are in different anatomic groupings. This is the subtle error.
15. B — includes the lesion excision.
16. B — the deepest tissue actually removed.
17. B — a single physician must act as both surgeon and pathologist.
18. B — the pathology is not separately reported; the repair is.
19. C — a large joint.
20. B — 20610. 20611 requires permanent recording and report; guidance alone is not enough.
21. B — the fracture site was not surgically opened. It says nothing about whether the fracture was compound.
22. B — an E/M plus the splint application. They are stabilizing and referring, not managing through healing.
23. B — the application is included; the casting material is separately reportable.
24. B — always includes diagnostic arthroscopy.
25. B — only when performed alone, or independently of and unrelated to other services at the same session.
26. B — the operative notes did not establish a distinct anatomic region, and the defense could not be built retroactively.

Exercises

Section A — The surgical package

A.1 Included. A.2 Excluded — modifier 57 for a major procedure. A.3 Included. A.4 Included. A.5 Included — typical postoperative follow-up. A.6 Excluded — modifier 78. A.7 Excluded — modifier 58. A.8 Excluded — modifier 24.

Section B — Global periods

B.9 Minor procedure, no postoperative days. Consequences: modifier 25 rather than 57 applies to a same-day E/M; and there is no postoperative period, so a later related visit is an ordinary billable E/M. B.10 Minor, 10 postoperative days. B.11 One preoperative day — the day before surgery. B.12 The global concept does not apply to the code. B.13 The payer determines the global period; typically unlisted codes. B.14 The code is included in another service's global period; add-on codes. B.15 The Medicare Physician Fee Schedule relative value file, published by CMS. It is free. B.16 Modifier 25 is at issue. Modifier 57 is definitely wrong — 57 is for the decision for major (090) surgery.

Section C — Reading the operative report

C.17 Preoperative diagnosis, postoperative diagnosis, the procedure heading, then the body — which is the source of truth. C.18 Code the body. The layered closure is an intermediate repair, separately reportable, and the heading omitted it. C.19 Query. You may not code a procedure the body does not document. C.20 Postoperative — it is what the encounter established. The preoperative diagnosis is what was suspected.

Section D — The measurement rule

D.21 0.3 + 1.2 + 0.3 = 1.8 cm. D.22 0.5 + 2.0 + 0.5 = 3.0 cm. D.23 The rule specifies the narrowest margin: 0.2 + 0.8 + 0.2 = 1.2 cm. (Students who use 0.4 have read "margins" and not "narrowest.") D.24 Excision: 2.6 cm (1.8 + 0.4 + 0.4). Repair: 2.6 cm (the defect). They are the same number by coincidence, not by rule — full credit requires saying so. The 2.3 cm pathology figure is used for nothing. D.25 Three separate excision codes, each measured 0.2 + 1.0 + 0.2 = 1.4 cm. Not added. D.26 No. Benign versus malignant comes from pathology, and the code families differ. Holding is correct, not a delay. D.27 Downward — formalin shrinks tissue, so the specimen is smaller than what was excised, which undersizes and undercodes. D.28 No specimen, therefore no pathology report. The destruction family must distinguish benign from malignant on clinical grounds.

Section E — Repairs

E.29 Simple: one-layer closure of a superficial wound. Intermediate: layered closure, or one layer of a heavily contaminated wound requiring extensive cleaning. Complex: more than layered — scar revision, extensive undermining, retention sutures. E.30 Intermediate. The second half of the definition. E.31 Simple: no, it is included. Intermediate: yes, separately reportable. E.32 One code, 5.5 cm — same classification, same anatomic grouping. E.33 Two codes: 3.0 cm and 1.5 cm. At intermediate complexity the trunk and the hand fall in different groupings. E.34 Two codes — different classifications are never added, even on the same body part. E.35 Simple. For intermediate you would need documentation of a layered closure, or of extensive cleaning and removal of particulate matter. "Irrigated" is neither. E.36 One code — adjacent tissue transfer, which includes the lesion excision.

Section F — Grafts, debridement, Mohs

F.37 By the square centimeters of the defect, primary plus secondary. It includes the lesion excision. F.38 The recipient site. F.39 Depth and area. The deepest tissue actually removed determines depth. F.40 No. "Down to fascia" describes what is exposed. Fascial debridement requires that fascia was debrided. F.41 Same depth → add: 27 sq cm, coded as the first 20 plus one add-on unit. F.42 Not Mohs — Mohs requires one physician acting as both surgeon and pathologist. Report an excision plus a separately reported pathology service.

Section G — Musculoskeletal and joint injections

G.43 Large. G.44 20610. 20611 requires permanent recording and report; guidance alone does not support it. G.45 One unit. The unit is the joint, not the injection. G.46 Two services — and Chapter 14 §14.8's bilateral and laterality rules now apply, including the payer-varying bilateral convention. G.47 The fracture site was not surgically opened. No — a compound fracture can receive closed treatment. G.48 The fracture was reduced — fragments manipulated into position — and it must be documented as such. G.49 E/M plus splint application and supply. Global fracture care would assert that the emergency physician had undertaken ninety days of fracture management. G.50 Global fracture care. Now included for 90 days: all normal follow-up visits and subsequent cast changes.

Section H — Casting and arthroscopy

H.51 Application: included. Material: separately reportable. H.52 Nothing — a replacement cast during the global period is included when the physician is reporting global fracture care. H.53 Explain that the application is included and has not been billed, and that what is on the claim is the supply, which is separately payable — offering the line and the code. Check the payer's own policy first, since some contracts bundle it. H.54 Surgical arthroscopy always includes diagnostic arthroscopy. H.55 Medial, lateral, patellofemoral. The note must name the compartment because several codes are written in terms of compartments and distinctness between procedures turns on it. H.56 Reportable only when performed alone or independently of other services at the same session. Example: diagnostic arthroscopy, which is why it is never reported alongside a surgical arthroscopy.

Section I — Code the note, twice

I.57 First pass: excision, right shoulder, 0.5 + 2.2 + 0.5 = 3.2 cm, benign/malignant pending pathology. Second pass: the body documents deep dermal sutures plus skin closure — a layered closure — an INTERMEDIATE repair, separately reportable, measured by the defect (3.2 cm). The heading omitted it. Two lines; hold line 1 for pathology.

I.58 First pass: arthroscopic partial medial meniscectomy. Second pass: the chondral debridement was performed in the lateral compartment — a different compartment from the meniscectomy — which is exactly the fact that makes a separate report potentially supportable, subject to the NCCI edit and its modifier indicator. The note named the compartment. That is the whole difference from Account 31-2245. Also: the diagnostic inspection is not separately reported.

I.59 (Account 10-4471.) 20610 — large joint (knee), no imaging guidance. Plus J1030 for the drug. Second pass: the lidocaine is local anesthesia and is inside the surgical package — not reported. "No aspirate obtained" confirms this was an injection rather than an aspiration-and-injection. Global period 000.

I.60 First pass: three lacerations. Second pass: forearms are both intermediate and both in the same grouping → add: 5.5 cm, one code. The scalp is simple — different classification → its own code, 4.0 cm. Two codes, not three and not one. "All wounds irrigated" does not make the simple repair intermediate.

Section J — Integration

J.61 The operative notes did not establish a distinct anatomic region, and the defense cannot be built retroactively. The sentence: "Debridement was performed in the subacromial space, anatomically distinct from the repaired supraspinatus insertion." J.62 Modifier 57. 25 is wrong because 25 applies to minor procedures (000/010); 57 applies to the decision for major (090) surgery. J.63 A documented negative. It closes the question of 20610 versus 20611 — without it, the note is silent about guidance, and silence requires a query. J.64 Expected shape: count, per surgeon, the number of major procedures performed and the number of E/M services reported with modifier 57 in the preceding period. A surgeon with substantial 090-day volume and near-zero modifier 57 is either referring in every case or writing off the decision visit. Grade for identifying a countable proxy — students who answer "review charts" have not designed an audit.

The Encounter checkpoint — §17.2 and §17.7

20610 carries a 000-day global.

Included: the immediate pre-procedure evaluation after the decision to inject · positioning · consent · the 1% lidocaine (local anesthesia) · the injection · the dressing · post-procedure instructions. No postoperative days at all.

Not included: the significant, separately identifiable E/M (line 1, modifier 25) and J1030, the drug — a supply, not a service.

Two settled questions: 000 → minor → modifier 25, not 57. And the lidocaine is absent from the claim because it is inside the package — a practice billing it separately is billing for something it has already been paid for.

And 20610 rather than 20611 because the note states "No imaging guidance used."

Grading note: full credit requires the lidocaine observation. Students consistently miss it, and it is the item that demonstrates whether they understood "the package" or merely memorized "000 = no postoperative days."

Chapter 18 — Answer Key

Quiz (26 questions)

1. B — the value of the diagnostic base procedure of that family.
2. B — not separately reported.
3. B — one snare code. Same technique, multiple lesions.
4. C — generally two codes, one per technique, subject to the edits.
5. B — Z12.11. The reason the patient came did not change.
6. B — the therapeutic code, because that is what was done.
7. D — duration of symptoms is not one of the five.
8. C — the open procedure only.
9. B — they bundle the catheter placement, injection procedures, and imaging supervision and interpretation.
10. B — which components were involved: generator, leads, or both.
11. B — a duplicate.
12. C — three: male genital, pathology, and radiology.
13. B — instrumentation and bone graft.
14. A — antepartum care, delivery, and postpartum care.
15. B — routine urinalysis.
16. C — each reports the components it actually provided.
17. B — in full.
18. C — by descending value, highest first.
19. C — an underpayment that pays, with nothing appearing in a work queue.
20. B — how the bilateral payment rules apply to that code.
21. C — postoperative management only.
22. B — each reports the same procedure code with the applicable modifier.
23. B — two surgeons each performing a distinct part, each documenting an operative report.
24. B — (base + time + modifying units) × conversion factor.
25. B — when the anesthesiologist begins preparing the patient for induction.
26. B — with administration of the sedating agent.

Exercises

Section A — Endoscopic base-code rule

A.1 Additional endoscopic procedures from the same family are reduced by the value of that family's diagnostic base procedure. A.2 Because every endoscopic procedure in a family includes getting the scope to where the work happens, and doing three things through one scope does not require inserting the scope three times. The base is the shared work. A.3 The ordinary reduction pays additional procedures at a percentage; the base-code rule subtracts a fixed value. They are different mechanisms and do not both apply. A.4 No. Parallels Chapter 17 §17.9: surgical arthroscopy always includes diagnostic arthroscopy. Both derive from the "(separate procedure)" designation. A.5 No — different families. Which reduction applies between two codes depends on the code set's family definitions, not on anatomic similarity. A.6 The multiple procedure indicator in the Medicare Physician Fee Schedule relative value file.

Section B — Colonoscopy

B.7 One. B.8 Two — one per technique, subject to the edits. B.9 Generally two, different techniques on different lesions. B.10 How far the scope went and why it stopped; the note must document the extent and, for a complete examination, the landmarks establishing that the cecum was reached. B.11 First-listed diagnosis Z12.11; procedure code the therapeutic (snare removal) code. B.12 The procedure code describes what was done; the diagnosis describes why the patient came, and a finding during a screening does not retroactively change the reason for the encounter. B.13 Modifier 33 and modifier PT. B.14 D12.5 — benign neoplasm of sigmoid colon. Chapter 34 §34.11 owns the financial resolution.

Section C — Hernia, conversion, digestive

C.15 Which hernia · initial or recurrent · reducible or incarcerated/strangulated · patient age · mesh implantation. C.16 "Recurrent." From the surgeon's side it is background — the reason the case was scheduled as it was — rather than a finding of the operation. C.17 Separately reportable with some repairs and included in others. There is no principle to reason from; read the code and its parenthetical. C.18 The open procedure only. C.19 Justified: documented additional work — adhesions, distorted anatomy, substantially increased time — described in a special report. Not justified: the conversion itself. C.20 Both are a fact the surgeon holds that the code depends on and that nobody has told them to dictate. Remedy in both: a one-page list of load-bearing sentences for the surgeons.

Section D — Cardiovascular, urinary, nervous

D.21 Organized by structure, then approach. D.22 Report the catheterization code, which bundles them. It appears on exams because older references list the components separately. D.23 Which components — generator, leads, or both. D.24 Per vessel or territory; the note must name the vessel. D.25 Errors: modifier 50 on an already-bilateral code (a duplicate), and a unilateral code reported once for a bilateral procedure (an underpayment). Avoid both by reading the descriptor and checking the bilateral surgery indicator. D.26 Three: male genital (the biopsy), pathology (the specimen), radiology (the guidance). D.27 Approach · level(s) · what was done · instrumentation and bone graft. D.28 It means reporting guidance separately alongside them is unbundling. Compliance consequence: it is detectable from claims data alone, with no chart required.

Section E — Maternity

E.29 Antepartum care, delivery, postpartum care. E.30 Any four of: visits for problems unrelated to the pregnancy · complications of pregnancy requiring additional care · laboratory other than routine urinalysis · ultrasounds · amniocentesis · fetal non-stress tests. E.31 Practice A reports antepartum care by visit count; Practice B reports delivery, or delivery plus postpartum depending on what it provided. E.32 Because coverage at the first prenatal visit may not be coverage at delivery, and the claim goes to the plan current at billing for care provided under a plan that is not. E.33 Counting the antepartum visits. The antepartum codes are divided by number of visits, so the count is the code. E.34 Honest answer: filing limits run from the date of service, which raises a real question about which date of service a nine-month package has. The real answer is in the payer's policy — read it before you need it.

Section F — Multiple procedures and line order

F.35 Highest-valued procedure paid in full, additional procedures at a reduced percentage. Assume nothing — verify by payer. F.36 Add-on codes and modifier-51-exempt codes. F.37 The multiple procedure indicator in the Physician Fee Schedule file. F.38 Descending value, highest first, because payer systems may apply the reduction in the order the lines appear. F.39 Highest-first: 1,200 + 400 + 200 = \$1,800.** Lowest-first: 400 + 400 + 600 = **\$1,400. Difference \$400. F.40 Nothing. The claim pays, the adjustment posts, the account closes.

Section G — Bilateral, split global, teams

G.41 One line/modifier 50/one unit · one line/modifier 50/two units · two lines RT and LT. G.42 How the bilateral payment rules apply to that code — including whether the code is already bilateral by descriptor, which is the eligibility question that precedes the convention question. G.43 56 preoperative management only · 54 surgical care only · 55 postoperative management only. G.44 The same procedure code, each with the applicable modifier. G.45 It could have, in principle — but it requires an agreed, dated transfer of care between two organizations that had never spoken, which is the coordination failure the case study was about. A mechanism that depends on coordination cannot fix a coordination failure. §17.7's answer — an E/M plus a splint, claiming nothing about the next ninety days — requires no coordination at all. G.46 Each surgeon performed a distinct part requiring their own skill set. Each must document their own operative report; one note signed by both does not establish it. G.47 80 is a surgeon assisting; AS is a non-physician assistant (PA, NP, CNS). The payment differs, and reporting one under the other misstates who performed the service. G.48 Several physicians of different specialties, plus support personnel, working as a team on a highly complex procedure.

Section H — Anesthesia and sedation

H.49 (base units + time units + modifying units) × conversion factor. H.50 Begins when the anesthesiologist begins preparing the patient for induction; ends when the patient may be safely placed under postoperative supervision. Source: the anesthesia record, not the operative report. H.51 6 base + (90 ÷ 15 = 6) time + 1 modifying = 13 units × \$22.00 = \$286.00. H.52 91 ÷ 15 = 6.07. 6 units or 7 depending on the payer's rounding rule, which this book cannot supply — it is published, per payer, and differs. H.53 P3, P4, P5 generally. H.54 Add-on codes for anesthesia complicated by extreme age, extreme hypothermia, controlled hypotension, or emergency conditions. Chapter 13 §13.7 applies: never reported alone, never modifier 51. H.55 Drug-induced depression of consciousness in which the patient responds purposefully to verbal commands, maintains a patent airway without intervention, and maintains adequate cardiovascular function. Not general anesthesia; not monitored anesthesia care (also acceptable: not minimal sedation). H.56 With administration of the sedating agent. Also required: continuous face-to-face attendance and an independent trained observer.

Section I — The Encounter

I.57 No reduction. Line 1 is an E/M, not a surgical procedure — a separately identifiable service with modifier 25, not a second procedure. Line 3 is a drug, a HCPCS Level II supply. Line 4, 36415, is a routine venipuncture and is not a surgical procedure subject to the reduction. Exactly one surgical procedure — line 2 — and the reduction requires two. I.58 The bilateral methodology applies; the multiple-procedure reduction does not. Under conventions A or B it is one line, adjusted bilaterally. I.59 Not a second line — a units question. J1030's descriptor is per 40 mg, and two knees at 40 mg each is two units on one line. Chapter 20 §20.4 owns the rule. I.60 The bilateral surgery indicator lookup would have answered whether the code was bilateral-eligible; reading the payer's provider manual would have supplied the convention. The lookup prevents one half of the failure and the reading prevents the other.

The Encounter checkpoint — §18.12

No multiple-procedure reduction is applied to Account 10-4471, because the claim contains exactly one surgical procedure.

The both-knees counterfactual (constructed — did not happen): bilateral methodology, not multiple-procedure; one line under conventions A or B; J1030 doubles in UNITS, not in lines.

Grading note: full credit requires walking all four lines. A student who answers "no, because there is only one procedure" without saying why the other three are not procedures has the right answer and has not demonstrated the reasoning — and the reasoning is the entire point of the checkpoint.

Chapter 19 — Answer Key

Quiz (26 questions)

1. B — supervision where required, and the interpretation and written report.
2. C — does not exist. No written report, no professional component.
3. B — whoever owns the equipment.
4. C — the PC/TC indicator.
5. B — without contrast. Oral contrast alone does not make a study "with contrast."
6. C — intravascularly, intra-articularly, or intrathecally.
7. B — one code, "without contrast followed by with contrast."
8. C — the limited study. A defined element not documented makes it limited.
9. C — per a defined number of fractions.
10. B — included; reporting it separately is unbundling.
11. C — the thirteen individual tests. The panel is not reportable unless every component was performed.
12. B — unbundling, and easily detected without any chart.
13. C — the separately identified and separately submitted specimen.
14. B — identifies specific drugs and quantities.
15. C — the specimen collection only.
16. B — referring or ordering provider.
17. C — the ordering physician is not enrolled with the payer. That belongs with credentialing (Chapter 25).
18. B — personally by the provider, during the encounter, on a specimen not easily transportable.
19. B — a CLIA-waived test performed by a waiver site.
20. C — escalate. The site performed a test its certificate does not cover; resubmitting sends a new claim for the same problem.
21. C — a medically necessary repeat performed to obtain subsequent results.
22. B — Medicine. Cardiovascular surgery is in the Surgery section.
23. B — an alternative to the E/M office visit codes.
24. C — the chemotherapy. Hierarchy overrides chronology.
25. C — both the vaccine product code and the administration code.
26. B — 1 unit. Total the timed minutes first: 8 + 8 = 16, which falls in the 8–22 band.

Exercises

Section A — Components

A.1 Hospital reports 71046-TC; the radiology group reports 71046-26. A.2 The practice reports 71046 — global, no modifier. A.3 Practice reports 71046-TC; the interpreting physician reports 71046-26. A.4 The practice reports nothing. Ordering is not performing. A.5 None. There is no professional component without a written report. A.6 The mobile unit, because it owns the equipment. Location does not decide it. A.7 The Medicare Physician Fee Schedule relative value file; the column is the PC/TC indicator. A.8 It asserts a service that does not exist — an interpretation and report for a code that has no professional component to report.

Section B — Radiology

B.9 Modality · body part · number of views · contrast. B.10 Without contrast. B.11 Contrast administered intravascularly, intra-articularly, or intrathecally. B.12 One — "without contrast followed by with contrast." B.13 The code — plain radiography codes are frequently divided by view count. B.14 The limited study. B.15 Consultation and clinical treatment planning · simulation · medical radiation physics and dosimetry · treatment delivery · treatment management, which is the one reported per a defined number of fractions. B.16 The radiopharmaceutical, reported with a HCPCS Level II code — Chapter 20.

Section C — Imaging guidance

C.17 (1) Is guidance named in the descriptor? → included. (2) Does a separate code exist for the procedure with guidance? → use that code. (3) Otherwise, is there a standalone guidance code? → separately reportable if its own requirements are met. C.18 No — it is included, and reporting it separately is unbundling. C.19 Question 2. A separate code exists: 20611 (with guidance) versus 20610 (without). Do not report guidance separately. C.20 Permanent image recording and a report. Stated previously at Chapter 14 §14.7 (the professional component) and Chapter 17 §17.7 (20611). One sentence: no report, no service.

Section D — Panels and pathology

D.21 Report a panel only if every component was performed; and do not unbundle a panel you did complete. D.22 The thirteen individual tests. D.23 Unbundling. Easy to find because the component pattern is visible in claims data with no chart required. D.24 Report the closest panel without exceeding what was done, then report the additional tests individually. Never build a panel from components. D.25 The specimen — each separately identified and separately submitted. Count containers. D.26 One container = one specimen; two labeled containers = two. D.27 Culture (per specimen or source) · identification (per isolate — here, two) · susceptibility (frequently per antibiotic or per plate). D.28 Presumptive indicates presence or absence of a drug or class; definitive identifies specific drugs and quantities. Pattern: large uniform definitive panels on standing orders, detectable because panel size and its uniformity across patients are visible in claims data alone.

Section E — Ordering, performing, CLIA

E.29 The performing entity bills. The ordering physician appears as the referring/ordering provider, by name and NPI — that is their entire role. E.30 The reference laboratory bills the tests; the practice bills the specimen collection. E.31 A test performed by an outside laboratory and billed by the reporting entity. E.32 Blank field · wrong person's identifier · ordering physician not enrolled · name/identifier mismatch. The third cannot be fixed by billing — it belongs with credentialing. E.33 Certificate of Waiver · Certificate for Provider-Performed Microscopy · Certificate of Compliance · Certificate of Accreditation. E.34 Performed personally by the provider, and during the patient encounter, on a specimen not easily transportable. E.35 A CLIA-waived test performed by a waiver site. E.36 Escalate — the site performed a test its certificate does not cover, which is a compliance problem. Do not resubmit; every resubmission is a new claim for the same problem.

Section F — Repeats and units

F.37 A repeat performed to obtain subsequent results. Not for: equipment failure · specimen problems · confirming a result · normal quality control. F.38 No. A code whose descriptor is "per hour" handles repetition through units, not through modifier 91. F.39 What is the unit? How many were performed? Do the answers match the claim? F.40 Too few units → underpayment. Too many units → overpayment. Both are invisible on the remittance.

Section G — The Medicine section

G.41 Cardiovascular studies are in Medicine; cardiovascular surgery is in Surgery. G.42 93000 is the global ECG with interpretation and report; 93010 is the interpretation and report only. They encode the professional/technical distinction — the same distinction §19.1 encodes with modifiers 26 and TC. G.43 General ophthalmological services — intermediate and comprehensive examinations for new and established patients; an alternative to the E/M office visit codes. G.44 A defined list of elements plus initiation of a diagnostic and treatment program. Chapter 15's standard is "medically appropriate," a clinical judgment; the eye codes use a checklist. G.45 Antigen preparation and injection — separate services, correctly on separate lines. G.46 The panel rule (§19.4) — components bundled into a more comprehensive study may not be reported alongside it.

Section H — Injections and infusions

H.47 Chemotherapy > therapeutic/prophylactic/diagnostic > hydration; and infusions > pushes > injections. H.48 Hierarchy. H.49 Chemotherapy = initial (plus add-on units for additional hours) · antiemetic = sequential push · hydration = subsequent. H.50 1030–1235 = 125 minutes → the initial hour plus one full additional hour. The remaining 5 minutes do not make a second add-on unit. H.51 Duration is unknown, so an infusion cannot be supported over a push and no add-on units can be supported. What remains is a single administration code. H.52 Initial — the primary service, selected by hierarchy, generally one per encounter per access site. Sequential — a different substance, after the initial, same access. Concurrent — at the same time as another.

Section I — Immunizations

I.53 Two — the vaccine product code and the administration code. I.54 The administration. A pure underpayment that never denies. I.55 Not necessarily. A vaccine supplied free through a public program may not be billed; the practice may still bill the administration. Adding the product would be billing for a vaccine somebody else paid for. I.56 Counseling by the physician or QHP — not clinical staff — documented.

Section J — Timed codes

J.57 Untimed codes are reported once per date regardless of duration. Timed codes are reported in units, commonly 15 minutes, and require constant attendance or direct one-on-one contact. J.58 Total all timed minutes on the date, then convert: 8–22 = 1 · 23–37 = 2 · 38–52 = 3 · 53–67 = 4 · 68–82 = 5. J.59 1 unit (8 + 8 = 16, in the 8–22 band). The common wrong answer is 2, produced by converting each service separately and adding the units. J.60 That the services are medically necessary and the documentation in the record supports it. Appending it automatically at a threshold is the same failure as an auto-appended modifier 59: a configuration making a factual assertion about a record that nobody has read — Chapter 14 §14.1, and Chapter 5 §5.3's reckless disregard.

Section K — The Encounter

K.61 On the reference laboratory's claim. The entity that performed the test bills it; Northgate collected and sent. K.62 36415, the venipuncture. \$14.00 charged, \$3.00 allowed. K.63 CLIA — does Northgate's certificate cover both tests, and is a modifier QW version applicable? The panel rule — 80061 requires that every component be performed. Units. K.64 Either specimen handling is not separately payable under this contract (correct not to bill) or it is payable and the practice is not billing it (Chapter 15 §15.9a). A practice finds out by reading the contract or asking the payer — waiting never resolves it.

The Encounter checkpoint — §19.12

Account 10-4471's claim carries 36415 and not 83036 or 80061.

The in-house counterfactual raises three questions: CLIA certificate coverage · the panel rule for 80061 · units. And the decision is a business decision about volume — certificate fees, proficiency testing, analyzers, reagents, personnel, and daily quality control against what the tests actually pay.

Grading note: full credit requires the rule ("the performing entity bills"), the identification of the reference laboratory as the biller, and the observation that Northgate's entire revenue from two laboratory orders is \$3.00. Students who answer only "the lab bills them" have the fact and not the rule. The \$3.00 is what makes the in-house question interesting, and students who notice it unprompted have understood the section.

Chapter 20 — Answer Key

Quiz (26 questions)

1. B — CMS.
2. B — published free.
3. B — quarterly.
4. C — J.
5. B — S and T.
6. B — the origin.
7. B — 10 units. 100 ÷ 10.
8. B — the 80 mg code, one unit. Use the code that matches the dose where one exists.
9. B — 1 unit. Whole units only; a fraction cannot be reported.
10. B — a five-fold underpayment that pays and is invisible.
11. B — drug name, dose, and route in the narrative, and generally the NDC.
12. B — average sales price plus a percentage add-on.
13. B — drug amount discarded and not administered to any patient.
14. A — zero drug amount discarded.
15. B — a claim with no JW line was ambiguous between "nothing wasted" and "waste not reported."
16. C — single-dose containers.
17. B — add up to the container.
18. B — it is evidence that an order was written; the medical record must independently support the need.
19. C — rented.
20. B — the item is rented for a defined number of months, after which ownership generally transfers or the arrangement converts.
21. B — CMS adopted a different threshold than CPT's and needed a code to carry it.
22. C — the beneficiary's risk status, which determines the coverage rule. The procedure is identical.
23. B — a labeler, product, and package size.
24. B — frequently different numbers in different units of measure, and that is correct.
25. B — valid but generally not separately payable, because the tray is a usual supply.
26. D — not medically necessary as documented.

Exercises

Section A — Structure and families

A.1 Level I is CPT; Level II is HCPCS Level II. A.2 CMS. It is published free — unlike CPT, which is copyrighted and sold (Chapter 13 §13.2). A coder with no budget can hold the entire Level II code set. A.3 Quarterly. The failure is a terminated code still in a charge master, denying on the first claim of the new quarter, worked as a one-off, recurring indefinitely. A.4 One letter followed by four digits. A.5 A permanent code is maintained through the public quarterly process with a formal application procedure; a temporary code is established quickly where no permanent code exists, and may become permanent, be replaced, or persist. A.6 J. A.7 E. A.8 L. A.9 T. A.10 S.

Section B — Ambulance

B.11 First character = origin; second = destination. B.12 Residence → hospital. B.13 Scene of an accident → hospital. B.14 Because nobody can pretend RH is a billing preference. It is a statement of physical fact, which is what every modifier is supposed to be (Chapter 14 §14.1) and what modifiers are most often used as if they were not.

Section C — J-code units

C.15 40 ÷ 40 = 1. C.16 120 ÷ 40 = 3 units of the 40 mg code — or, where an 80 mg code exists, 80 mg code × 1 + 40 mg code × 1, per payer policy. C.17 100 ÷ 10 = 10. C.18 75 ÷ 25 = 3. C.19 75 ÷ 100 = 0.75 → 1 unit. The limitation: you cannot report a fraction of a unit, and the shortfall cannot be expressed at all. C.20 The 80 mg code, one unit. The error to avoid is two units of the 40 mg code, which describes the same milligrams and is a pattern edits look for. C.21 Units question: 60 mg administered ÷ the descriptor's dosage. Waste question: 40 mg remained in a single-dose vial → a JW line. C.22 Too few units → invisible underpayment. Too many units → overpayment, caught by MUEs. C.23 Chapter 21 — medically unlikely edits. C.24 Drug name, dose, and route in the narrative, plus generally the NDC. C.25 They price manually because the code identifies nothing, so a person must read the narrative. They should be temporary because when a specific code is established the unclassified code becomes wrong, and the practice is generating manual-review claims for no reason. C.26 Average sales price plus a percentage add-on, republished quarterly.

Section D — Waste

D.27 JW: drug amount discarded and not administered to any patient. JZ: zero discarded. D.28 Because a claim with no JW line meant either nothing was wasted or nobody reported the waste — two very different facts that looked identical. D.29 No. A multi-dose vial holds doses for more than one patient; its remainder is not waste. D.30 J1030 with the administered units + a JW line with the discarded units. Check: the two must add up to the 40 mg container. D.31 Administered 75 ÷ 25 = 3 units; JW 25 ÷ 25 = 1 unit; 3 + 1 = 4 units = 100 mg = the container. ✓ No JZ. D.32 One line, 3 units, and JZ. No waste from a multi-dose vial. D.33 In the medical record. The claim is the assertion; the record is the evidence (Chapter 5 §5.4). D.34 It is a formula, and formulas are not observations — waste is a physical event that either happened or did not.

Section E — DMEPOS

E.35 Withstands repeated use (excludes disposables) · serves a medical purpose · not useful absent illness or injury (excludes comfort items) · appropriate for use in the home (excludes facility-only equipment). E.36 A written order with the beneficiary's name, the item, the prescribing practitioner and identifier, and the order date. E.37 Independent support in the medical record for why this patient needed this item, in the terms the item's policy requires. E.38 Documentation is not evidence of the qualification; it IS the qualification. E.39 NU new purchased · UE used purchased · RR rented. E.40 A rental running a defined number of months, after which ownership generally transfers or the arrangement converts. Track the rental month — payment and the arrangement change over its course. E.41 Continued medical need. The framing is useful because it makes the recurring obligation visible: the record must support the need each time, not once at the beginning. E.42 It limits who may furnish certain items in certain areas to contracted suppliers. It relates to §20.10's theme because a correct claim from a non-contracted supplier is still not payable — a code existing is not the same as being permitted to furnish the item.

Section F — G, Q, S, T

F.43 (1) CPT has no code — a Medicare-specific benefit such as the annual wellness visit. (2) Medicare needs a different rule — G2212 versus 99417. (3) Medicare needs a distinction CPT would not make — G0105 / G0121. F.44 CPT created 99417 with one threshold; CMS adopted a different threshold and created its own code to carry it. The service is the same; the rule is not. F.45 The beneficiary's risk status, which determines the applicable screening frequency limitation. It is a coverage distinction, not a procedural one. F.46 G. Because G-codes are frequently placeholders — they get replaced by CPT codes, or retired when a measurement program changes. F.47 S and T. F.48 Q.

Section G — NDC

G.49 An NDC identifies a product in a package (labeler, product, package size); a J-code identifies a dosage. They describe different things, so the claim carries two quantities in two units of measure. G.50 No, and they should not be expected to match. G.51 Format (leading zeros/segments) · a stale NDC · a mismatched unit-of-measure qualifier · a quantity copied from the wrong identifier. G.52 No — it is a factual error. The claim reports a product that was not administered. G.53 Store the correctly formatted NDC, its unit of measure, and its conversion factor against the charge master line, so the claim assembles them rather than a person retyping them. G.54 Because the format conversion is mechanical and a human doing it by hand will get it wrong at a predictable rate that does not improve with experience. Training addresses skill; this is not a skill problem.

Section H — Payability

H.55 Any four: local anesthesia in a package · usual dressings, sutures, drapes · the surgical tray · routine office supplies consumed in a visit. H.56 Casting and splinting materials · drugs · implants and devices · items dispensed for home use. H.57 Bundled · not a benefit at all · not recognized by this payer · not medically necessary as documented. H.58 The fourth. H.59 Concede that the item is not separately payable under this contract, agree to remove the charge master line, and ask whether it is excluded across the board or only for facility claims. Do not appeal — the code is correct and the payment policy is that it is bundled, and both are true. H.60 Who is paying. Three approaches: by memory (fails on vacation, untraceable error rate) · by a payer-specific rule in the claim system (works, and is what most organizations should do) · by separate charge master entries with payer mappings (more maintenance, more control, where large organizations end up).

Section I — The Encounter

I.61 40 ÷ 40 = 1 unit. The enabling sentence: Figure 4.2's procedure note documents "methylprednisolone acetate 40 mg." ("Steroid injected" would support no units at all.) I.62 JZ. 40 mg supplied, 40 mg administered, nothing discarded. The claim as coded on Day 1 carries J1030 with no modifier — an incomplete assertion rather than an overpayment. I.63 Local anesthesia is inside the surgical package for 20610 (Chapter 17 §17.2). The principle: a drug being codeable in HCPCS Level II does not make it separately payable. I.64 \$18.00** is a charge set by the practice — **Chapter 23 §23.7** owns it. **\$6.28 is an allowed amount derived from a published quarterly average sales price file.

The Encounter checkpoint — §20.4

Account 10-4471, line 3: J1030 × 1. \$18.00 charged, \$6.28 allowed.

Grading note: full credit requires the arithmetic, the JZ conclusion, and the observation that the units are computable only because the note states the dose. Students who answer "one unit because one injection" have reached the right number by the wrong route and will get the next one wrong.

Do not accept "bill JW for the leftover" — there was no leftover. This is exactly Case Study 1's failure in miniature, and it is worth pointing out when a student produces it.

Chapter 21 — Answer Key

Quiz (26 questions)

1. B — published by CMS, free, updated quarterly.
2. B — the code that is not separately payable when reported with Column One.
3. B — practitioner services and outpatient hospital services.
4. C — no modifier will override under any circumstances.
5. B — a modifier may override if circumstances justify it and documentation supports it.
6. B — a permission, not an authorization.
7. B — there is nothing to appeal to. The appeal was not poorly written.
8. B — the maximum units of service for a code, per beneficiary, per date.
9. B — a date-of-service edit, policy-based, that cannot be exceeded.
10. B — MAI 2.
11. C — report the additional units on additional lines with appropriate modifiers, where clinically justified.
12. B — a published maximum invites billing up to it.
13. B — published by CMS, free, updated annually.
14. B — services integral to a procedure are included in it and not separately reportable.
15. B — local anesthesia administered by the operating physician.
16. C — only the completed procedure.
17. B — "Was this separate?"
18. B — "Did both of these actually happen?"
19. B — already written and already signed.
20. B — the note affirmatively documents debridement of the structures that were repaired. (A is a weaker and less accurate statement of the problem.)
21. C — XS, separate structure. Use the specific modifier where one applies.
22. B — the edits are public, so not looking is deliberate ignorance.
23. B — per claim.
24. B — a private party brings an action on the government's behalf and shares in the recovery.
25. B — does not guarantee payment; other payers apply their own edits.
26. C — three.

Exercises

Section A — What the edits are

A.1 CPT contains codes that overlap because procedures genuinely contain other procedures, and a code set describing services cannot enumerate every combination that would double-count. Somebody has to write down which combinations are not payable together. A.2 Yes, in advance. What follows: a payer telling you before you bill exactly which combinations it will not pay, and why, is unusually fair — and a practice surprised by an NCCI denial had not looked. A.3 Nothing. Free download. A.4 The claim does not survive: the file was public, free, and searchable the entire time. This is §21.10's deliberate-ignorance point in miniature. A.5 Column One is the payable code; Column Two is the code not separately payable with it. A.6 No, the direction is fixed. A claim reporting both is paid on Column One and denied on Column Two, regardless of line order. A.7 Practitioner services and outpatient hospital services. Using the wrong one gives a wrong answer confidently, because the same pair may be edited in one setting and not the other. A.8 Column One code · Column Two code · effective date · deletion date · modifier indicator · (and the setting-specific file you are in). The modifier indicator decides whether an override is possible.

Section B — The modifier indicator

B.9 Nothing. No modifier will override, under any circumstances. B.10 It permits a modifier to be accepted by the system if circumstances justify it and documentation supports it. It does not say the edit should be overridden. B.11 The edit does not apply — it has been deleted, and the indicator keeps the historical row readable. B.12 No. There is nothing to appeal to. B.13 Bundled — remove the charge. B.14 It has asserted that the minority case is its normal case. A payer sees it as a modifier frequency rate on a code pairing, from claims data, with no charts.

Section C — MUEs

C.15 Units — the maximum units of service for a code, per beneficiary, per date, per provider. C.16 Anatomic considerations · code descriptors · CMS policy · nature of the service · claims data analysis. C.17 A claim line edit; units above the MUE may be reported on additional lines with appropriate modifiers where clinically justified. C.18 A date-of-service, policy-based edit — absolute. Do not appeal; find the units error. C.19 A date-of-service, clinical-benchmark edit — appealable with documentation. C.20 MAI 1: 3 on one line, the remaining 5 on additional lines with modifiers if justified. MAI 2: do not appeal; 8 is not possible — find why the system said 8. MAI 3: appeal with documentation. C.21 Because a published maximum invites billing up to it. No — the dose or the anatomy decides the units; an MUE is a detection threshold, not a target. C.22 They should have looked up the MAI first. Now: split the historical denials by MAI, stop appealing the MAI-2 category entirely, and redirect the time — which is Case Study 1.

Section D — Policy and principles

D.23 CMS's statement of the policies behind the edits. Free, updated annually. D.24 A general correct coding policies chapter followed by chapters corresponding to the CPT sections. D.25 It tells you what the edit protects (so you know what would genuinely separate the services) · it frequently answers the question outright · and it is what a reviewer will read. D.26 Services integral to the performance of a procedure are included in it and not separately reportable. D.27 Any six: prepping/shaving/cleansing · draping and positioning · IV access · sedation where not separately reportable · local/topical/regional anesthesia by the operating physician · surgical approach and exposure · surgical cultures · wound irrigation · closure and dressings · splints at the operative site. D.28 The greater procedure only. D.29 Sequential procedures — attempted one way, completed another; report only the completed one. D.30 Local anesthesia by the operating physician is integral. Reasons given so far: Chapter 17 §17.1/§17.2 (the surgical package), Chapter 20 §20.10 (usual supplies; a code existing is not a code being payable), and Chapter 21 §21.6 (standards of practice). Three chapters. D.31 Comprehensive/component: one code's service includes the other's. Mutually exclusive: the two could not reasonably both have been performed, or are two ways of doing the same thing. D.32 "Was this separate?" and "Did both of these actually happen?" A distinctness modifier asserts separateness, which is an answer to the first question and irrelevant to the second.

Section E — The override decision

E.33 Stop at step 3. Simple repair is included in excision; there was no separate circumstance because the closure genuinely was part of the excision. Remove the line. E.34 All four steps pass. Different lesion, different site, intermediate rather than simple. Override with XS. E.35 Stop at step 2/3 — and note this is mutually exclusive, not comprehensive/component. A modifier answers the wrong question. One of the two codes is wrong. E.36 All four pass. The note names a different anatomic region, says so explicitly, and states a separate indication. E.37 Stop at step 3. "Debridement performed" establishes nothing. E.38 Stop at step 3 — and this is worse than E.37: the note affirmatively documents the thing the edit exists to prevent being billed twice. E.39 Stop at step 1. Indicator 0. No statement by any surgeon overrides it. E.40 All four pass; the specific modifier is 25 and it is already correct. E.41 XS — separate structure. XS says why; 59 says only "somehow distinct" (Chapter 14 §14.5). E.42 Reject it. Asking eighteen months later is asking someone to remember. The defense is contemporaneous documentation and cannot be built retroactively, and this falls outside Chapter 33 §33.5's query rules.

Section F — The shoulder claim

F.43 Line 2, 29826 — an add-on code with a ZZZ indicator. An add-on and its primary are a required pairing, not a bundling question. F.44 Column One 29827, Column Two 29822, indicator 1. F.45 That debridement in the same anatomic region as a repair is not separately reportable. F.46 Step 3. "There was no supporting sentence" is not right because it understates the problem: the note affirmatively documents debridement of the repaired structures — it establishes the opposite of what the modifier asserts. F.47 For the thirty-one: two lines (29827-RT, 29826-RT). For the eleven: three lines, with the debridement modified. F.48 XS. Separate structure is what was true, and Chapter 14 §14.5 requires the specific modifier where one applies.

Section G — The False Claims Act angle

G.49 Actual knowledge · deliberate ignorance · reckless disregard. Not looking at a public file falls under deliberate ignorance. G.50 The edits are public · the pattern is quantifiable from claims data · penalties attach per claim and unbundling is repetitive · qui tam suits commonly originate with an employee who noticed a macro. G.51 The pattern and the response. A single unbundled claim is an error; the same combination on every claim for eighteen months is a configuration. G.52 It knows. Chapter 5 §5.8's sixty-day rule attaches on identification, and the organization is no longer arguing about whether it knew. G.53 A provision permitting a private party to bring an action on the government's behalf and share in the recovery. G.54 Report the pattern, not an instance · in writing, promptly, keeping a copy · to compliance. Do not pull thirty charts to check first.

Section H — Non-NCCI edits and appeals

H.55 Payers that adopt NCCI (in whole or part; Medicaid has its own files) · payers with proprietary edits · payer medical policies functioning as edits. H.56 No. Account 10-4471's line 1 was overridden correctly under NCCI and denied on day 17 by a commercial payer applying its own policy. H.57 A proprietary edit. Ask: is this NCCI or plan-specific? · which policy or rule? · is it published, and where? · is it modifier-eligible, and which modifier? H.58 "NCCI allows this." NCCI is not their rule set, and asserting it invites a conversation about a file that does not govern. H.59 Indicator 0 (no) · indicator 1 with supporting documentation (yes) · indicator 1 without (no) · MAI 2 (no) · MAI 1 or 3 (workable) · proprietary (get the policy first). Three say do not appeal. H.60 Redirect it to charge correction — faster, cheaper, and correct — and to the categories that can actually be won.

Section I — The Encounter

I.61 Column One 20610, Column Two 99214, indicator 1. I.62 That an E/M on the same date as a procedure is included unless it is significant and separately identifiable above and beyond the usual pre- and post-procedure work. Modifier 25's test, verbatim — the modifier and the edit are two halves of one policy. I.63 Three chronic conditions individually assessed with plans · prescription drug management · two tests ordered with stated reasons · a new problem evaluated independently. Three of the four have nothing to do with the knee. I.64 The override was correct under NCCI; the payer applied its own edit policy and denied. Both are true because they are different rule sets. The day-59 appeal succeeds because the documentation that justified the modifier is the same documentation that wins the appeal — you build it for the claim, not for the appeal.

The Encounter checkpoint — running the edit for 99214 + 20610

The override is correct. The payer denied it anyway on day 17 (CO-97 / N19).

Grading note: full credit requires all four steps and the observation that a correct override is not a guaranteed payment. Students who conclude the practice made an error have missed the chapter's most important distinction — NCCI is Medicare's rule set, and this was a commercial payer applying its own.

Do not accept "the payer was wrong." The payer applied a policy it is entitled to apply, and the practice won on appeal because its documentation satisfied a stricter standard. Both parties behaved defensibly, which is the point.

Chapter 22 — Answer Key

Quiz (26 questions)

1. B — a payer's determination, under published criteria, that it will pay.
2. C — both.
3. B — the payer already knows; the question is whether the record contains what the policy requires.
4. B — the Social Security Act, § 1862(a)(1)(A).
5. B — an exclusion from payment.
6. B — binding nationwide.
7. B — have no NCD. That is why local determinations exist.
8. B — only when the beneficiary participates in an approved study or registry.
9. B — a Medicare Administrative Contractor, for its jurisdiction.
10. C — the billing and coding article.
11. B — the response to comments.
12. C — anyone, with supporting evidence.
13. C — no published criteria govern; the general standard applies. This is the normal case.
14. B — will deny.
15. B — the diagnosis is wrong and a supporting, documented diagnosis exists.
16. B — coding to the policy rather than to the record.
17. B — denies. Sixteen days, not twelve months.
18. D — the referring physician's signature is not an ABN requirement.
19. B — improper.
20. A — Option 1.
21. B — the beneficiary.
22. B — no ABN required; GY, and GX if a voluntary notice was given.
23. B — the practice reports GA, asserting a valid notice that is not valid, and bills on paper that shifts nothing.
24. B — confirms medical necessity criteria as presented, but not eligibility, benefits, or that the service matched.
25. B — never going to be covered on that record.
26. B — correct; a diagnosis established later does not reach backward.

Exercises

Section A — The distinction

A.1 A clinical determination is a professional judgment under a standard of care. A coverage determination is a payer's decision under a contract or statute, against published criteria. A.2 Chapter 20's medically appropriate braces; a standard-of-care treatment excluded from a benefit package. A.3 An annual screening in a patient who had one last month; imaging before required conservative therapy. A.4 No. The criterion is the policy's criteria applied to the record. A.5 It does nothing — the payer already knows the physician ordered it; that is why there is a claim. A.6 Expected shape: "The record documents [the specific facts the policy requires]: [quote them]. Policy [X] requires [Y], and the record establishes it at [location]." A.7 Not medically necessary as documented. A.8 Because the other three — bundled, not a benefit, not recognized by this payer — are settled by rules that exist independently of the record. Only medical necessity is established by what the record contains.

Section B — The statutory standard

B.9 Social Security Act § 1862(a)(1)(A). B.10 As an exclusion. It matters because Medicare does not list what it pays for — it pays for covered benefits and excludes what is not reasonable and necessary. That is why coverage determinations describe WHEN a service is covered. B.11 Preventive care — a service that is neither diagnostic nor therapeutic falls outside the phrase, which is why each Medicare preventive benefit required its own statutory addition. Chapter 34. B.12 No. The content comes from coverage determinations — NCDs and LCDs.

Section C — NCDs, LCDs, and articles

C.13 A nationwide, binding CMS determination whether Medicare covers an item or service. Not numerous — a few hundred. C.14 Covered · not covered · covered with conditions. The third is most operationally important because "covered when [criteria] are met" is an instruction, and the criteria are what documentation must satisfy. C.15 Coverage conditioned on the beneficiary participating in an approved clinical study or registry. It imposes registry participation and reporting requirements, sometimes specific codes or modifiers, and they are not optional. C.16 A contractor's determination within its jurisdiction. "Jurisdictional" means the same service may be governed by different LCDs in different states. C.17 No. C.18 The operational detail: the CPT/HCPCS codes, the ICD-10-CM codes that support medical necessity, documentation requirements, and utilization expectations. C.19 The billing and coding article. C.20 Proposed LCD published → comment period → open meetings and advisory committee → final LCD with response to comments → notice period → reconsideration available. C.21 The response to comments — it states what objections were raised and why the policy did or did not change, which tells you what arguments have already been tried. C.22 Anyone may request revision of an existing LCD with supporting evidence. It is "the only door" because it is the sole mechanism in the book by which the person doing the work can change the rule rather than comply with it.

Section D — Finding the policy

D.23 Identify the payer → look for an NCD → look for an LCD in your jurisdiction → read the billing and coding article → if nothing is found, the general standard applies. D.24 §22.10 — the commercial medical policy. D.25 No published criteria govern. The general reasonable-and-necessary standard applies and the record's clinical rationale supports it. This is the normal case, not a problem. D.26 Search the Medicare Coverage Database by CPT code, filtered to your state; then find the diagnosis list inside the article. D.27 Is there a different, TRUE diagnosis that IS supported and IS documented? If yes → the coding was wrong, correct it. If no → the service was never covered for this patient. D.28 Only when the alternative diagnosis is a condition the patient genuinely has and it is documented in the record. Then the original coding was incomplete.

Section E — Linkage

E.29 Diagnosis pointers (Chapter 25 §25.5). E.30 The line denies. The pointer is the linkage. E.31 The diagnosis is wrong (fixable) · the diagnosis is right and does not support the service (not fixable). E.32 Reading the record first and then finding the code is coding. Reading the covered list first and then searching the record is selecting a code because it pays. E.33 The assessment never states that conservative therapy failed. The information — six weeks of intermittent ibuprofen with partial relief — is in the history of present illness, not the assessment. Location matters because a reviewer skimming the assessment will not see it and a structured review will not find it. E.34 No. A coder may not relocate the physician's reasoning. The correct handling is a documentation improvement conversation — Chapter 38 §38.3 — one sentence in the assessment.

Section F — Frequency and ABNs

F.35 Per calendar year · per rolling 12 months · per N years · per lifetime · per episode. F.36 Calendar year: payable (new year). Twelve months: denies (16 days). F.37 Calendar year: payable. Twelve months: denies by one day. F.38 From the last date of service. Your system may not know because the service may have been performed elsewhere and paid by the same payer. F.39 No. Eligibility and benefit inquiries can sometimes answer it (Chapter 24 §24.3). F.40 In advance · specific as to service and reason · a cost estimate · a choice. F.41 Option 1 (furnish, bill Medicare) · Option 2 (furnish, do not bill) · Option 3 (do not furnish). The beneficiary selects. F.42 Option 1 preserves; Option 2 destroys; Option 1 is almost always better for the patient. F.43 A routine ABN and a blanket ABN. Structural reason: an ABN's function is to inform a beneficiary of a specific, expected noncoverage so they can decide — a form everyone signs for everything informs nobody of anything. (Also acceptable: an ABN for a statutorily excluded service, or one given after the fact.) F.44 No. GY, plus GX if a voluntary notice was given. F.45 Because the practice reports GA — asserting a valid notice that is not valid — and bills the patient on paper that shifts nothing, producing a document showing it knew a notice was required and produced a defective one. F.46 If statutorily excluded: no ABN was required, the patient may be billed, apologize for not telling them in advance. If expected denial with no valid ABN: the patient may not be billed — remove it. What determines it: whether the service was a benefit at all.

Section G — Coded wrong versus never covered

G.47 Coded wrong. Correct the claim. G.48 Never going to be covered on this record. G.49 Never going to be covered. G.50 Never going to be covered — the frequency criterion is not met. (Verify the last date of service; if the eight months is wrong, it becomes a different question.) G.51 Coded wrong. Add the pointer and resubmit. G.52 Neither, exactly — it is an authorization mismatch (Case Study 1), and the path is a post-service review, not a medical necessity appeal. G.53 Three appeals asking a payer to reach a conclusion its own published criteria forbid. The record says what it says. G.54 A phone call to the referring office · four more weeks of documented conservative therapy · a resubmission. G.55 Expected shape: "The plan requires six weeks of documented conservative therapy and the referral shows four weeks of NSAIDs plus a patient report of physical therapy. If Dr. — can document two more weeks with dates and outcome, we can resubmit and it should approve." G.56 "The MRI was denied." It does not tell them what to do.

Section H — Commercial and prior authorization

H.57 It states coverage criteria, lists codes, and frequently lists supporting diagnoses — the function of an LCD plus its billing and coding article. H.58 No. It does not confirm eligibility on the date of service, benefit availability, or that the service performed matched the service authorized. H.59 A conversation between the treating physician and a payer's physician reviewer. The coder's role: know it exists, know the deadline, get it scheduled. H.60 Because a conversation surfaces facts a form did not ask for — a physician can state a decisive clinical fact in ten seconds that nobody knew to put in writing.

Section I — The Encounter

I.61 No. (1) The patient is covered by a commercial PPO and the ABN is a Medicare instrument. (2) Even for a Medicare patient, there was no specific individualized expectation of denial — 20610 for M25.561 in a symptomatic patient is an ordinary covered service — so an ABN would have been improper. I.62 No — it was an edit denial asserting the E/M was incidental to the procedure (Chapter 21 §21.9). An ABN would not have addressed it, would not have shifted liability, and could not have been justified in advance. I.63 No. Chapter 12 §12.3: code to the highest degree of certainty established at that encounter. On March 14 no definitive diagnosis existed and no imaging had been obtained. I.64 Both are answers about what was true at the time, and in both the temptation is to reason backward from what happened later. The record is evidence of what was known when it was written.

The Encounter checkpoint — Q3 and Q5, both CLOSED

Q3 — an ABN? NO, for two independent reasons.

And the day-17 denial was CO-97 / N19 — an EDIT denial, not a necessity denial.

Q5 — the knee is M17.11, established by imaging obtained after March 14. And M25.561 was CORRECT for March 14, because no definitive diagnosis had been established.

Grading note: for Q3, full credit requires both reasons. Students who give only the commercial one have the right answer for an incomplete reason and will get the Medicare version wrong. For Q5, full credit requires the statement that a later diagnosis does not reach backward — a student who says the March claim should be corrected has made the error the checkpoint exists to prevent, and it is worth correcting individually.

Chapter 23 — Answer Key

Quiz (26 questions)

1. B — a contracted rate.
2. B — a ratio expressing resources relative to other services.
3. B — practice expense.
4. B — practice expense (facility and non-facility).
5. B — a specialty society survey, a committee recommendation, and CMS acceptance or modification.
6. B — at the national average.
7. B — relative cost.
8. C — one, national.
9. B — RVU changes must not increase total spending beyond a statutory threshold.
10. B — \$96.52.
11. B — the conversion factor came down more.
12. B — in the summer, with a comment period.
13. B — the practice expense RVU.
14. B — the facility supplied the overhead and bills separately.
15. C — on-campus outpatient hospital.
16. B — a wrong payment on an otherwise perfect claim.
17. D — none.
18. B — different percentages. The realized rate depends on service mix.
19. B — \$90.00. Payers pay the lesser of billed and allowed.
20. B — does not increase contracted payment; inflates the gross rate's denominator and sets what a self-pay patient is asked for.
21. B — a historical artifact adjusted by across-the-board increases, with no current method behind it.
22. B — applying the same multiple to every code rather than raising everything by a percentage.
23. B — self-pay discounts under a written, consistently applied policy.
24. B — they leave no record anywhere in the billing system.
25. B — roughly halves.
26. B — rise.

Exercises

Section A — The three numbers

A.1 \$185.00 the **charge** (a decision) · \$128.40 the allowed amount (a contract) · \$96.52 Medicare's allowed amount (an equation). A.2 The Medicare figure. You need the code's RVUs, the locality GPCIs, and the conversion factor — all free. A.3 The contract. A.4 The charge. A.5 (1) You cannot evaluate a contract you cannot price. (2) You cannot detect an underpayment without knowing what was owed. (3) The fee schedule is the reference every other number is described against. A.6 The gap between "we have a contract" and "we know what our contract pays."

Section B — RVUs and the formula

B.7 Work — physician time, skill, effort, judgment, stress. Practice expense — overhead. Malpractice — liability. B.8 Practice expense, because the answer depends on who supplied the overhead. B.9 Malpractice. B.10 A productivity measure; physician compensation is frequently expressed in dollars per work RVU. B.11 A code is created → a specialty society surveys its members → a multispecialty committee recommends values to CMS → CMS accepts, modifies, or rejects → the value appears in the proposed then final rule → periodic review of potentially misvalued codes. B.12 Because there is no instrument that measures physician effort — the values express how a code's work compares to other codes', as assessed through survey and committee. What follows: expecting them to behave like measurements will mislead you. B.13 A formal category of codes identified for revaluation. Their RVUs can go down. B.14 (1.92 × 1.000) + (0.89 × 1.008) + (0.13 × 1.005) = 1.92000 + 0.89712 + 0.13065 = 2.94777; × \$32.7442 = **\$96.52. B.15 (1.92 × 1.050) + (0.89 × 1.120) + (0.13 × 1.400) = 2.01600 + 0.99680 + 0.18200 = 3.19480; × 32.7442 = \$104.61.** **Malpractice moved most in percentage terms (+40%)** and least in dollars — which is the point about the smallest component being the most variable. **B.16** 2.94777 × 31.0000 = **\$91.38. The conversion factor fell 5.33%; the payment fell 5.33%. B.17 Because the change is proportional and universal — one number moves every payment in the fee schedule by the same percentage. There is no code-level negotiation; there is one lever. B.18 Budget neutrality.** If other codes were revalued upward, the conversion factor is adjusted downward to offset — and a 4% RVU increase against a larger conversion factor decrease produces a net decrease.

Section C — GPCIs, conversion factor, rulemaking

C.19 The locality is at the national average. C.20 Cost. It matters because the adjustment does not claim the service is worth more in one place — it claims it costs more to provide, which is a defensible empirical claim rather than a value judgment. C.21 One. C.22 That RVU changes not increase total spending beyond a statutory threshold. It makes the pool essentially fixed, so increases must be offset. C.23 A rule can raise the RVUs for a set of codes and reduce the conversion factor to maintain budget neutrality. Both statements describe the same rule. C.24 Proposed rule (summer, with comment period) → comments close → final rule (~November) with responses to comments → effective January 1. C.25 The responses to comments. C.26 LCD development and NCD reconsideration (Chapter 22 §22.3–§22.4). All three are open, on a calendar, and almost nobody in the field participates.

Section D — Site of service

D.27 The practice expense RVU. D.28 Because the facility supplied the overhead and bills separately for it. D.29 No — it moves. The facility bills for its own costs on the facility claim. D.30 The place of service code. D.31 Office 11 · inpatient hospital 21 · on-campus outpatient hospital 22 · emergency department 23 · ambulatory surgical center 24. D.32 The place of service changes 11 → 22, and the physician's payment drops because the facility now bills separately. D.33 Office→facility is an underpayment — accrues silently, expires under timely filing. Facility→office is an overpayment — Chapter 5 §5.8's sixty-day rule attaches on identification. D.34 Compare the place of service on your claims against where the service was actually rendered, for one month. (And, for organizations generating both claims: a facility claim and a non-facility place of service for the same encounter cannot both be right.)

Section E — Building and comparing

E.35 [(work × work GPCI) + (PE × PE GPCI) + (MP × MP GPCI)] × conversion factor. E.36 99214 133.03% · 20610 124.21% · J1030 115.44% · 36415 100.00%. E.37 216.28 ÷ 168.24 = 128.55%. E.38 The blended rate is 128.55% and not one line is at 128.55%. E.39 No. The practice doing more E/M earns above 128.55%; the one doing more laboratory earns below it. The same contract is a different contract for a different practice. E.40 Price your own top twenty codes by volume against Medicare, compute the percentage for each, weight by your volume. An afternoon in a spreadsheet.

Section F — Charges

F.41 A charge below the allowed amount caps the payment at the charge. F.42 \$90.00. F.43 No. The patient's responsibility is computed from the allowed amount, not the charge. A low charge only reduces what the payer pays — a transfer from the practice to the insurer. F.44 No. It inflates the gross collection rate's denominator · it sets what a self-pay or out-of-network patient is asked for · and it becomes the number quoted in public discussions of health care prices. F.45 Nobody at the practice can derive it. A historical artifact from a fee-schedule reference product, adjusted since by across-the-board increases, never re-derived. F.46 185.00/96.52 = 191.67%; 150.00/63.28 = 237.04%; 18.00/5.44 = 330.88%; 14.00/3.00 = 466.67%. No consistent multiple exists. F.47 It sits above every contracted rate, so it caps nothing — and it is doing that by accident. F.48 Price your Medicare schedule → find your highest contracted rate per code → set one multiple of Medicare that clears it → apply the same multiple to every code → review annually → write it down with a date and an owner. F.49 Step 4. Across-the-board percentage increases preserve and multiply every existing distortion; a single consistent multiple re-derived from the fee schedule flattens them in one pass. F.50 The same service carries the same charge regardless of payer, with payer differences living in the allowed amount. F.51 Self-pay discounts · financial assistance · prompt-pay discounts. Condition: a written, consistently applied policy. F.52 Routinely waiving patient cost-sharing · charging an uninsured patient the full chargemaster amount while every payer pays a fraction.

Section G — Chargemaster and charge capture

G.53 Scale (tens of thousands versus hundreds of lines) · it includes items, not just services · it has no single owner. G.54 Terminated codes still in the file · dead items · across-the-board adjustments · lines that were never payable. A4550 illustrates the fourth. G.55 A machine-readable file of standard charges — gross charges, payer-specific negotiated rates, discounted cash prices, and de-identified minimum and maximum negotiated charges — plus a consumer display of shoppable services. G.56 Pricing other organizations' contracts against Medicare, which was not previously possible. G.57 The bill. Responding mechanisms: financial assistance policies · discounted cash prices · good faith estimates. G.58 Never entered · never interfaced between systems · entered after the cycle closed · entered against a closed or wrong account · removed by an edit or rule. G.59 Because it leaves no claim, no denial, no queue item, and no report line — you cannot reconcile against a record that does not exist. Detection must come from outside the billing system. G.60 Schedule → charges · signed notes → charges · clinical logs → charges · supply and pharmacy usage → charges. The second is one join and should be built first.

Section H — Collection rates

H.61 Gross = payments ÷ charges. Net = payments ÷ what you were entitled to collect after contractual adjustments. H.62 The gross rate roughly halves; the net rate is unchanged; performance did not change at all. H.63 It raises it. The underpaid amount is written off as a contractual adjustment, leaving the denominator — so the ratio improves as the problem worsens. H.64 Lost charges · underpayments written off as contractual · undercoding. The ratio measures how well you convert entitled revenue into received revenue. The three measurements that answer what it cannot: charge capture reconciliation (§23.9) · coding audit (Ch. 35) · underpayment comparison (Ch. 28 §28.8).

The Encounter checkpoint — Q6, CLOSED

Why did Northgate charge \$185.00 for a 99214?

Nobody at the practice can derive it.

(Constructed history.) The charge originated from a fee-schedule reference product years ago and has been increased by across-the-board percentage adjustments since. No current method produces \$185.00.

Not a multiple of Medicare:

What it does correctly, by accident: \$185.00 is **above Northfield's \$128.40 and Medicare's \$96.52, so it caps nothing** — which is the charge's one essential function.

Grading note: full credit requires the honest answer and the observation that the charge is nonetheless performing its function. Students who answer "it was set at some multiple of Medicare" have not done the arithmetic; the four ratios disprove it and computing them is the exercise.

Do not accept "the practice charges high to get more money." §23.7 disposes of this: a higher charge produces no additional payment from any contracted payer. A student who believes otherwise has missed the one rule in the section.

Chapter 24 — Answer Key

Quiz (26 questions)

1. B — at registration.
2. C — roughly 90 to 1.
3. C — no denial at all; a patient who never receives a bill and an account that ages.
4. C — "Has anything changed?"
5. B — January. Plan years turn over, employers change carriers, deductibles reset.
6. B — a patient safety matter, because medical identity theft contaminates the victim's record.
7. B — the eligibility and benefit inquiry.
8. B — 278.
9. B — reflects claims the payer has processed, and therefore lags.
10. B — ask the patient for too much.
11. B — the payer has no other coverage on file.
12. C — at scheduling, 48–72 hours before, and on the day of service.
13. C — at scheduling.
14. B — who the patient sees.
15. B — a non-binding advance review.
16. C — the patient's copayment amount is not part of the authorization scope.
17. B — a number, not a record.
18. B — it reflects the payer's records; the questionnaire asks the patient.
19. B — an overpayment, to which the sixty-day rule attaches on identification.
20. C — workers' compensation.
21. C — routinely waiving patient cost-sharing.
22. B — method of payment, stating the amount as a fact.
23. B — the allowed amount.
24. C — \$84.88 (78.60 + 6.28, the full allowed amount, with no deductible met).
25. B — \$47.58.
26. C — asking what the visit was for.

Exercises

Section A — The cost of an error

A.1 Registration (ask again, retype — no claim exists) · scrubber (claim held, corrected, released) · clearinghouse (a rejection; a report is worked, corrected, resubmitted — and only if somebody reads the report) · adjudication (a denial; work queue, research, correction, resubmission, with the timely filing clock running) · after timely filing. A.2 0.5 · 3 · 12 · 30–60 (commonly), across several touches. A.3 Roughly 90 to 1. In minutes rather than dollars because minutes are what a staffing decision is made in, and because whatever the loaded rate is, the same number multiplies both sides — the ratio survives it. A.4 The entire allowed amount. A.5 It would need a fully loaded labor rate, which Chapter 31 §31.7 publishes. Chapter 40 owns the conversion for Account 10-4471 specifically, and this chapter deliberately does not perform it. A.6 The saving is visible and the cost is not. The saving appears in the front-end budget where it is measured; the cost appears as denial volume in a different department, overtime in a third, and lost revenue in a category that appears on no staffing report at all.

Section B — Registration fields

B.7 She may be "Elizabeth" on the policy → subscriber not matched. Ask: "How does your name appear on your insurance card?" B.8 June 31 does not exist and the transposition means the patient does not exist to the payer → front-end rejection. Read the date back. B.9 Cards get reissued and plans change identifiers on renewal. Copy from the card in hand. B.10 Many adults are covered as a dependent on a spouse's policy → the claim goes to a policy the patient is not on. Ask who holds the policy. B.11 A payer may have dozens of products; the claim is routed on a guess. Capture the group number and the plan name from the card. B.12 See B.15. Read the street address back. B.13 Workers' compensation is likely primary → billing the health plan is billing the wrong payer. Ask the accident/injury questions. B.14 The record is complete for a situation that no longer exists. Ask the scripted question. B.15 None. It produces a patient who never receives a bill, an account that ages, and eventually a collection action against someone who was never told — Case Study 1. B.16 O/0 · I/1 · S/5 · B/8. B.17 January — plan years turn over, employers change carriers, deductibles reset. B.18 "Has anything changed with your insurance, address, or phone since we saw you?" About ten seconds.

Section C — Identity

C.19 Verifying that the person present is the person on the coverage. C.20 A claim for services the coverage holder did not receive (a billing dispute) · permanent contamination of the victim's medical record · a patient harmed by information that is not theirs. C.21 The record contamination — unwinding it is difficult, sometimes impossible, and the victim frequently discovers it during care they need. C.22 A question, not an accusation. Names change, cards are old, and most mismatches are ordinary — but a practice with no identity step has no way to notice the one that is not.

Section D — Eligibility

D.23 270 = the eligibility and benefit inquiry; 271 = the response. D.24 Active status · plan and group · copayment · deductible and amount met · coinsurance · other coverage on file · sometimes referral/authorization requirements. D.25 That coverage will still exist on the date of service · a current deductible · whether the service is medically necessary · anything the payer chose not to populate. D.26 Because it reflects claims the payer has processed, not claims incurred. It errs toward asking the patient for too much. D.27 That the payer has no other coverage on file — a statement about the payer's records. D.28 No. Chapter 22 requires the governing coverage policy and its supporting diagnosis list. D.29 At scheduling · 48–72 hours before · day of service. D.30 Scheduling: no coverage, wrong payer, non-contracted plan, an authorization requirement. 48–72 hours: terminations, plan changes, a deductible figure fresh enough to estimate from. Day of: yesterday's termination. D.31 At scheduling — the only point the encounter can still be rearranged. D.32 Batch submits the whole schedule and returns a file — used for the pre-visit sweep. Real time answers one patient in seconds — used at the desk. D.33 It is early enough that a problem can be addressed and late enough that the answer is still true. D.34 As of what date? · What is this response silent about? · What did the payer say versus what did my system display?

Section E — Referrals, authorizations, and who obtains them

E.35 A PCP's direction of a patient to a specialist. Generally the PCP's to issue. E.36 A payer's advance approval of a specific service. About what. E.37 Generally a synonym for prior authorization; sometimes a distinct admission notification. Ask what it means in that payer's contract. E.38 A non-binding advance review of coverage. Not binding. E.39 Expected shape: "They're two separate things and a visit can need both. The referral is your primary doctor saying it's okay for you to see us — that's about who. The authorization is your insurance approving the specific procedure — that's about what. We have the first one. I'm checking whether the plan requires the second, and I'll call you back today either way." E.40 Authorization number · date obtained · issuing person or system · approved codes · approved date range · approved units/visits · approved facility · approved rendering provider. E.41 Codes · date range · facility · rendering provider — the four that drifted. E.42 Because the payer's next question after "we have an authorization" is for what, on what date, at what site, by whom — and a practice holding only a number cannot answer. E.43 Authorizations obtained for one thing and used for another · authorizations that had expired · authorization numbers entered that were never obtained — a false statement on a claim. E.44 No universal answer — it varies by payer and market. E.45 The party who knows the codes is best placed · the party who does not get paid without it has the incentive · whoever obtains it must communicate the scope. E.46 The scope — date range, units, codes, facility, provider — to whoever bills it.

Section F — MSP and cost-sharing

F.47 Whether another payer is primary to Medicare. F.48 Group health through current employment (own or spouse's, subject to employer-size rules) · work-related injury → workers' compensation · accident → auto, no-fault, or liability · black lung · VA-authorized services · the ESRD coordination period. F.49 Because it reflects the payer's records, which are frequently wrong; the questionnaire asks the patient. F.50 It is an overpayment; Chapter 5 §5.8's sixty-day rule attaches on identification, and Chapter 31 §31.9 covers the recoupment. F.51 Workers' compensation is primary. The fall occurred at work, and workers' compensation is generally primary for treatment of a work-related injury — that question comes before the Medicare-versus-group-health analysis entirely. F.52 Two. The work-related injury, and independently the large-employer group health plan covering her through a spouse's current employment. F.53 Collect copayments, coinsurance, and deductibles at the time of service · offer payment plans · offer financial assistance under a written policy · offer prompt-pay or self-pay discounts under a written policy. F.54 Routinely waive cost-sharing. The word is "routinely" — an individualized hardship determination under a written policy is a different thing, and the difference is a written policy and a record.

Section G — Asking, clearing, estimating

G.55 "Your copay for today is \$30.00. How would you like to take care of that?"* — it states the amount as a fact, does not ask permission, and **the question is about method rather than about whether.** **G.56** Asking within earshot of others · insisting when someone says they cannot · quoting a number you cannot stand behind. **G.57** Stop pressing; **offer a payment plan (Chapter 32 §32.7) or financial assistance (§32.8).** **G.58** Identity/demographics · coverage for the date of service · coordination of benefits · referral · authorization with scope · medical necessity screening · estimate · patient informed · collection attempted or arrangement made. **G.59** **Medical necessity screening.** It catches a Chapter 22 §22.11 problem **before** the service rather than after, applying Chapter 22's coverage-policy apparatus in advance. **G.60** 78.60 × 0.20 = **\$15.72; 6.28 × 0.20 = \$1.26**; total **\$16.98. G.61 \$84.88 — the full allowed amount, since nothing has been applied to the deductible. A five-fold difference. G.62 Expected shape: "That assumes your deductible is met, which our check this morning says it is. If a claim from another provider is still processing, this could be higher, and the statement will show you why." Grade for naming the specific thing that could move*, not for generic hedging.

Section H — Measurement

H.63 Clean claim rate · front-end denial rate · eligibility verification rate for the date of service · authorization capture rate with scope · point-of-service collection rate. H.64 Front-end denial rate. H.65 Of encounters that generated a front-end denial, what percentage had a completed clearance checklist? High → the checklist is missing an item (the process ran and the claim denied anyway). Low → the checklist is not being completed (staffing, workload, or training). H.66 It predicts that a front-end problem will be experienced as a back-end volume problem, and the organization will respond by adding back-end staff — which works and costs roughly ninety times as much staff time per instance. The fix is routing the existing report: front-end denials, classified by cause, sent weekly to the people who cause them, with accounts attached, as feedback rather than discipline.

Section I — The Encounter

I.67 Verified eligibility for the date of service · asked whether anything had changed · correctly determined no referral required · correctly determined no authorization required for an established-patient office visit · collected the \$30.00 copay. **I.68** **Nothing on the schedule said a procedure might happen**, so no authorization screening for 20610 was possible. **Not an error** — a question nobody had written down. **I.69** \$30.00 copay on the office visit, plus 20% coinsurance on 20610 (\$15.72), J1030 (\$1.26), and 36415 (\$0.60) = **\$47.58, leaving \$17.58 billed after the fact. I.70 Ask what the visit is for · screen the likely procedure against the authorization list · frame the copay as a copay. The third** would have made the day-70 statement expected.

The Encounter checkpoint — §24.11

Rewind Account 10-4471 to check-in, Tuesday March 14.

And the honest note: 20610 did not require prior authorization under Northfield Mutual's policy. That is luck, not process — nobody checked.

Grading note: full credit requires students to say the front desk did not make an error. A student who answers "they should have collected \$47.58" has misunderstood the section — nobody could have known the injection would happen. The miss is a question that was not asked, and the chapter is explicit about the distinction.

Chapter 25 — Answer Key

Quiz (26 questions)

1. B — 837P.
2. B — the National Uniform Claim Committee.
3. B — the scanner is calibrated not to see the form's own lines.
4. B — item 4.
5. B — employment, an auto accident, or another accident.
6. B — asserts that a signed authorization exists and is current.
7. C — 17b.
8. D — twelve.
9. B — A through L.
10. B — a duplicate.
11. A — the prior authorization number or the CLIA number.
12. B — six.
13. C — four.
14. B — four.
15. C — the practice's charge.
16. B — supplemental information including NDC data for drug lines.
17. B — denies.
18. B — an individual, the person who performed the service.
19. B — an organization.
20. C — identity, and nothing else.
21. B — the supervising physician's NPI, paid at 100%.
22. B — the service was performed somewhere other than the billing address.
23. B — accept the allowed amount as payment in full.
24. B — how that payer requires the standard transaction to be populated.
25. B — blank, because nobody referred her.
26. B — B, the diabetes.

Exercises

Section A — What the form is

A.1 The professional claim; the 837P. A.2 The NUCC; the reference instruction manual, free. A.3 (1) The electronic claim carries the same data in a different container, and rejection messages name items. (2) It is the industry's shared vocabulary — payers, clearinghouses, and vendors describe problems by item number. A.4 An item names the form; a loop or segment names the 837P. A.5 Because a paper claim is processed by optical character recognition, and the scanner is calibrated not to see the red lines — it reads what is in the boxes. A.6 Handwriting · anything outside its box · highlighting · correction fluid (also acceptable: staples through the data area). They all create marks the scanner misreads. A.7 The rigid field positions and the fixed six service lines — both are consequences of machine reading rather than design choices. A.8 Because items changed between versions, and payer instructions reference specific versions.

Section B — Items 1–13

B.9 1a. B.10 2. B.11 4. B.12 6. B.13 10a–10c. B.14 9. B.15 11d. B.16 Item 2 = the child; item 4 = the parent; item 6 = CHILD. B.17 That a signed and current authorization exists. Three others: GA (a valid ABN is on file, Ch. 22) · JW (this much was discarded, Ch. 20) · KX (the documentation supports necessity, Ch. 19). B.18 Either there is no other coverage, or nobody asked. It matters because the secondary claim, the coordination-of-benefits information, and whether a balance is genuinely the patient's all depend on which it is.

Section C — Items 14–23

C.19 17b. C.20 21. C.21 19. C.22 22. C.23 23. C.24 20. C.25 A qualifier saying what the date is — onset, injury, or last menstrual period. The same date means different things under different qualifiers, and a date without one is a number with no meaning. C.26 Twelve, labeled A through L, plus the ICD indicator. C.27 A duplicate — and the original problem is still unfixed. C.28 The prior authorization number or the CLIA certificate number. What you are billing determines which; laboratory claims need the CLIA number (Ch. 19 §19.6).

Section D — Item 24

D.29 24B. D.30 24D. D.31 24E. D.32 24F. D.33 24G. D.34 24I/24J. D.35 Six. More services become multiple claims — and Ch. 18 §18.8's sequencing means the highest-valued procedure belongs on the first line of the first claim. D.36 Four. For a fifth, report modifier 99 and put the additional modifiers in item 19. D.37 The charge. It matters because payers pay the lesser of billed and allowed (Ch. 23 §23.7) — a charge below the allowed amount caps the payment. D.38 NDC data for drug lines · narrative descriptions for unlisted codes · supplemental provider identifiers · anesthesia minutes (any three).

Section E — Pointers

E.39 Twelve in item 21; four per line. The asymmetry means a claim can carry diagnoses that support no line and lines that cannot reach every diagnosis — and coders reflexively point everything at everything. E.40 Letters in the 02/12 version; older habits produce numbers. E.41 Point letters · point only what supports that line · sequence matters · a line pointed at a non-supporting diagnosis denies. E.42 The line denies, even though a supporting diagnosis is on the claim (Ch. 22 §22.6). E.43 Office visit → A B C (if the note supports all three being addressed — Ch. 15 §15.5). Spirometry → A. Venipuncture → C. E.44 It is three false statements instead of one true one. "It denies" is not the primary objection because the claim now asserts clinical relationships that do not exist — and the pointer is the medical necessity linkage. E.45 The blood was drawn for the hemoglobin A1c, a diabetes test. Pointing it at the knee would assert that a venipuncture treats knee pain. E.46 A pointer is a claim about why a service was performed — if you would not say the sentence out loud, do not point the line.

Section F — Providers and identifiers

F.47 Rendering (24I/24J) · billing (33, 33a, 33b) · service facility (32, 32a, 32b). F.48 Rendering is a person; billing gets paid. F.49 When the service was performed somewhere other than the billing address. F.50 Type 1 = an individual. Type 2 = an organization. F.51 Type 1 in the rendering field (24J); Type 2 in the billing field (33a). F.52 Identity. Not enrollment · not participation · not eligibility to be paid. F.53 Specialty. Ch. 15 §15.2's new-versus-established test and Ch. 16 §16.2's initial-versus-subsequent test both turn on specialty as the payer has it recorded. F.54 The supervising physician's, paid at 100%. F.55 That a physician performed or supervised the service under conditions that did not exist. An overpayment. F.56 That the provider accepts the allowed amount as payment in full. In network it reports a fact (the contract already requires it); out of network it is a decision.

Section G — Rejections

G.57 A rejected claim was never adjudicated — it did not reach the payer's processing. A denial is a decision the payer made about a claim it processed. G.58 Patient not found · subscriber/relationship · referring provider · diagnosis problems · pointer problems · billing provider · missing required field. G.59 Six of seven. That the rejection report is Chapter 24's argument arriving in a different form. G.60 Blank · wrong person · not enrolled with the payer · name/NPI mismatch. The third cannot be fixed by billing — it is a credentialing matter, and resubmitting will not change it. G.61 A payer's published document stating how it requires the standard transaction populated. The NUCC manual says what an item is for; the companion guide says what this payer requires in it. G.62 Bilateral reporting conventions (Ch. 14 §14.8) and proprietary edit policies (Ch. 21 §21.11).

Section H — Read a claim you did not build

H.63 Items 4 / 9 / 11d. The claim says other coverage exists and supplies no other insured. Either 11d is wrong or 9 and 4 are incomplete. H.64 Item 17. Nobody referred the patient to themselves — a data-entry default that introduces a rejection cause where none existed. H.65 Items 24B and 32. Place of service 22 with a blank item 32 asserts a hospital outpatient service performed at the billing address. Ch. 23's Case Study 1 — and this line pays wrong without denying. H.66 Item 24G. Two units of a timed therapy code requires 23 minutes of total timed services (Ch. 19 §19.11), and the claim asserts it. H.67 Item 27. Non-assignment from a contracted group misrepresents the practice's own agreement. H.68 They will find nothing — the codes are fine. They will miss four of the five errors, all of them non-clinical fields. The lesson: on a denied claim, the instinct is to check the codes, and the codes are usually fine.

Section I — The Encounter

I.69 ICD indicator 0 (ICD-10-CM). A = M25.561 · B = E11.9 · C = I10 · D = E78.5. I.70 Line 1 (99214-25) → A B C D, because the E/M addressed all four problems, which is what made it separately identifiable. Line 2 (20610-RT) → A, the knee. Line 3 (J1030) → A, the drug went into the knee. Line 4 (36415) → B, the blood was drawn for the A1c. I.71 Item 17 blank — the performing physician is the patient's own PCP; nobody referred her. Item 20 "no" — the reference laboratory bills 83036 and 80061 on its own claim (Ch. 19 §19.12). Item 29 \$30.00 — the copay collected at check-in (Ch. 24 §24.11); omitting it would ask the payer for money already collected. I.72 The lidocaine (Ch. 17 §17.1's package · Ch. 20 §20.10's usual supplies · Ch. 21 §21.6's standards of practice — three independent reasons) · 83036 and 80061 (Ch. 19 §19.12) · 99000 (Ch. 19 §19.12 — Northgate has never asked whether it is payable).

The Encounter checkpoint — §25.10

Account 10-4471's CMS-1500, built from twenty-four chapters of decisions.

Grading note: full credit on I.70 requires a justifying sentence per line, not just the letters. A student who gives "A B C D / A / A / B" has memorized the answer; a student who can say why line 4 points at B has understood the section.

And do not accept "line 1 points at all four because there are four diagnoses." It points at all four because the E/M addressed all four, which is Ch. 15's problems element and Ch. 14's modifier 25 evidence appearing as a claim field. If the note had addressed only the knee, line 1 would point at A alone — and modifier 25 would be unsupportable (Ch. 15 §15.10, Reading 4).

Chapter 26 — Answer Key

Quiz (26 questions)

1. B — CMS-1450.
2. B — 837I.
3. B — the National Uniform Billing Committee.
4. C — form locators.
5. B — hospital, outpatient.
6. C — a replacement of a prior claim.
7. B — a duplicate.
8. B — the department or cost center that provided it.
9. C — emergency room.
10. B — drugs requiring detailed coding, with a HCPCS code and units.
11. B — generally not required on most lines.
12. B — the payment system; the DRG derives from diagnoses and procedures.
13. C — occurrence span codes.
14. D — a value code. (A count is an amount.)
15. B — an inpatient admission changed to outpatient before discharge.
16. B — where the patient went at the end of the stay.
17. B — a per-diem amount rather than the full DRG.
18. B — a mismatch between two fields that must agree.
19. B — the patient control number, which the payer returns on the remittance.
20. B — chiefly responsible for the encounter, established after study.
21. B — non-covered charges.
22. C — the attending provider.
23. B — bundled into the inpatient claim in defined circumstances.
24. B — compatible with the rule; it was correct as a standalone claim and should not have been one.
25. B — falls, because the practice expense moved to the facility.
26. C — nearly doubles.

Exercises

Section A — Why institutions bill differently

A.1 UB-04 and CMS-1450. The same form. A.2 837I; the professional counterpart is the 837P. A.3 The NUBC — National Uniform Billing Committee. It publishes the Official UB-04 Data Specifications Manual, and no, it is not free — it is a subscription publication, unlike the NUCC's manual for the CMS-1500. A.4 Form locators (FL). A.5 A physician sells professional work — evaluation, judgment, a procedure performed. An institution sells a place with things in it: a staffed unit, an operating room, a pharmacy, nursing hours, a bed for the night. A.6 (1) The unit of billing is frequently the STAY rather than the service — an inpatient claim can list forty charges and be paid one DRG amount. (2) Charges are grouped by DEPARTMENT, hence revenue codes. (3) Much of what the payer needs to know is not a service at all, hence the circumstance codes. A.7 Two claims and two patient balances — Ch. 16 §16.1. A.8 Was the patient admitted from the emergency department · did they leave against medical advice · was this a readmission · what covered days remain (any three).

Section B — The form locators

B.9 FL 1–13 who and where · FL 14–41 the circumstances · FL 42–49 the charges · FL 50–65 the payers · FL 66–75 the diagnoses and procedures · FL 76–81 the providers and the rest. B.10 FL 4 (type of bill — what kind of claim this is) and FL 6 (statement covers period — what dates it covers). B.11 FL 42–49, the charge block — twenty-two lines per page, and a claim can run to multiple pages. The final page carries FL 47's total and revenue code 0001. B.12 FL 3a is the PATIENT CONTROL NUMBER, the facility's identifier for this encounter or account. FL 3b is the MEDICAL RECORD NUMBER, its identifier for this person. A patient with eleven admissions has eleven control numbers and one medical record number. B.13 Autoposting breaks — the payer returns FL 3a on the remittance, and a medical record number in that field returns an identifier that does not identify an account. Ch. 28 §28.7's process depends on it. B.14 FL 67 principal — what was chiefly responsible, established after study. FL 69 admitting — what was suspected at admission. FL 70 reason for visit — why the patient presented, on outpatient claims. B.15 That nobody is populating them thoughtfully. A hospital's admissions do not routinely confirm the initial impression — chest pain becoming acute myocardial infarction is the normal case, and the disagreement is the story of the admission. B.16 Charges the payer is not being asked to pay. Omitting a known non-covered charge is worse because it removes the payer's record of it — and on the patient side, it removes the basis for billing the patient at all.

Section C — Type of bill

C.17 0 leading zero · 1 hospital · 3 outpatient · 1 admit through discharge. C.18 0 · 1 hospital · 1 inpatient Part A · 1 admit through discharge. C.19 2 skilled nursing · 3 home health · 7 clinic (including RHCs and FQHCs) · 8 special facility (including hospices and ambulatory surgical centers). C.20 1 inpatient Part A; 3 outpatient. C.21 1 admit through discharge · 7 replacement · 8 void/cancel. C.22 A sequence of interim claims — first, continuing, last. They must be submitted in order and must not overlap. C.23 A duplicate, not a correction — and the original problem is still unfixed. C.24 A blank item 22 (the resubmission code) on a professional resubmission. Same failure, different form. C.25 0131. C.26 0118.

Section D — Revenue codes

D.27 A revenue code says WHERE — the department or cost center. A HCPCS code says WHAT — the service or item. D.28 0250 pharmacy · 0270 medical/surgical supplies · 0300 laboratory · 0320 diagnostic radiology · 0450 emergency room · 0636 drugs requiring detailed coding. D.29 The TOTAL line, appearing once, on the last page. D.30 The ACCOMMODATION — private, semi-private, ward — and the LEVEL OF CARE — general medical/surgical, intensive care, coronary care, nursery. D.31 Lines under more than one accommodation code, with the units on each showing how many days at that level. D.32 FL 48, non-covered charges — generally a non-covered differential, and one of the few places a facility bills a patient for something the payer correctly declined. D.33 Add the units across the accommodation lines; they should reconcile to the statement-covers period, allowing for the discharge-day convention. When they do not, something about the dates or the transfers is wrong. D.34 Because 0636 identifies a specific drug in a specific quantity where 0250 is pharmacy generally. 0636 requires a HCPCS code and units on the same line — and the units are Ch. 20 §20.3's arithmetic, dose administered ÷ the descriptor's dosage. D.35 0320, diagnostic radiology — not 0450. The revenue code follows the DEPARTMENT that performed the service, not the department the patient arrived in. D.36 The chargemaster. (1) A terminated HCPCS code on a chargemaster line, which denies on every claim carrying it. (2) A revenue code the payer does not accept for that type of bill. (3) A line whose revenue code requires a HCPCS with none mapped. None is a coding decision; all three are maintenance problems wearing a claim's clothes.

Section E — Circumstance codes

E.37 Condition (FL 18–28) — a circumstance that is true. Occurrence (FL 31–34) — a date something happened. Occurrence span (FL 35–36) — a date range. Value (FL 39–41) — an amount. E.38 Fact · date · range · amount. E.39 Because a CMS-1500 describes services performed on a person, and everything it needs fits in a code, a modifier, a date, and a pointer. A UB-04 describes an EPISODE inside an institution, and an episode started somewhere, lasted a period, was interrupted, ended in a disposition, and consumed benefit days. None of that is a procedure. E.40 Date of injury → OCCURRENCE · four covered days → VALUE · a qualifying stay March 2 to March 5 → OCCURRENCE SPAN · an inpatient admission changed to outpatient before discharge → CONDITION (Condition Code 44) · the Part A deductible amount → VALUE. E.41 Covered days, because "days" feels like a span. It is not a range with a start and an end — it is a NUMBER, and the families are distinguished by shape, not subject matter. E.42 The report that an inpatient admission was changed to outpatient before discharge. A CONDITION code. E.43 OCCURRENCE SPAN. The field matters because Ch. 16 §16.3's three-day qualifying-stay requirement arrives on the claim as this field — the benefit depends on it. E.44 Registration (admission source and type) · the unit (discharge status) · utilization review (Condition Code 44) · the business office (value codes for benefit amounts).

Section F — Discharge status and providers

F.45 Where the patient went at the end of the stay. F.46 01 · 02 · 03 · 07 · 20 · 30. F.47 A hospital that transfers a patient rather than discharging them may be paid a per-diem amount rather than the full DRG — under defined circumstances, for defined DRGs, when the length of stay is below the geometric mean. F.48 01 on an actual transfer OVERSTATES the payment; a transfer status on an actual discharge UNDERSTATES it. Both are wrong on a claim that is otherwise perfect, and neither denies. F.49 Because 30 means "still a patient," which is only true on an interim claim. It must agree with FL 4's frequency digit. F.50 01 where the record documents a transfer · 30 on a non-interim claim · a facility whose distribution of discharge statuses differs markedly from comparable facilities, which is measurable from claims data with no chart. F.51 Reconcile FL 17 against the discharge summary, on a sample, on a schedule. A coder can run it, and it is one of the few facility-side checks nobody is running. F.52 FL 76 attending — primary responsibility during the stay. FL 77 operating — the surgeon. FL 78/79 other — with a qualifier stating the role. F.53 FL 77, when a surgical procedure is reported in FL 74. A claim with a procedure and a blank FL 77 is internally inconsistent. F.54 None of them. The institution bills — FL 1's name and address and FL 56's NPI carry that. Ch. 25's rendering-versus-billing confusion produces the same denials here.

Section G — Dates and windows

G.55 The from and through dates for the services on this claim. (1) Every service date must fall within it. (2) Interim claims must not overlap. (3) It is not the same as the stay on an outpatient claim — a series claim covers a month of visits, correctly. G.56 They overlap on March 10, double-counting a day. The payer will reject or recoup it. G.57 Outpatient services furnished by a hospital — or a wholly owned or operated entity — within three days before an inpatient admission are, in defined circumstances, bundled into the inpatient claim rather than billed separately. G.58 One day, for psychiatric, rehabilitation, long-term care, and certain other excluded facilities. G.59 Diagnostic services in the window are generally bundled. Non-diagnostic services are bundled when they are RELATED to the admission, with an attestation mechanism for stating that they were not. G.60 It does not work, and it is not actually a disagreement. The claim was correct as a standalone claim; the rule says it should not have been a standalone claim. Those two statements are compatible.

Section H — The Encounter as a facility claim

H.61 Very little, and that is the point. Same four codes — 99214-25, 20610-RT, J1030, 36415. Place of service becomes 22 instead of 11, and the professional payment drops, because the practice expense RVU is now the facility value. H.62 A second claim — a UB-04. Type of bill 0131. H.63 0510 clinic (the facility charge) · 0636 drugs/detail carrying J1030 with units · 0300 laboratory (the venipuncture). Plus 0001, the total line. H.64 M25.561, the right knee pain — the reason for the encounter. The other three (E11.9, I10, E78.5) follow as other diagnoses. H.65 Total \$361.00** *(148.60 + 212.40)*, which is **1.67×** the independent \$216.28. Patient \$84.52** *(\$30.00 copay + 20% of \$60.20 = \$42.04, plus 20% of \$212.40 = \$42.48), which is 1.78× the independent \$47.58. H.66 It is for making one thing unmistakable: the claim's shape is determined by who owns the building, not by what happened to the patient. It is NOT an argument that the conversion is improper — hospital outpatient departments carry costs an independent office does not. It is an argument that the patient cannot see any of it.*

Section I — Reading a claim

I.67 FL 4 · FL 6 · FL 17 · FL 42 · FL 67 · the codes. The codes come last, because they are usually fine — the same lesson as Ch. 25 §25.9. I.68 The type of bill's frequency digit · the discharge status, entered by someone who is not a coder · a revenue code that does not match the charge. I.69 It is the medical record number, not the patient control number. FL 3a is per encounter. The remittance will return an identifier that does not identify an account, and the claim will not autopost. I.70 The discharge status is wrong. Correct value 02 or 62, depending on the receiving facility — Community Rehab suggests 62, an inpatient rehabilitation facility, and the receiving facility's type settles it. The direction is OVERPAYMENT. I.71 Whether those are drugs requiring detailed coding, which belong under 0636 with a HCPCS code and units rather than 0250. I.72 The principal diagnosis is implausible. Essential hypertension as the condition chiefly responsible for an eight-day admission, with COPD with acute exacerbation secondary, is very likely a sequencing error. Ch. 33 §33.2 governs, and the error costs the facility a great deal.

Chapter 27 — Answer Key

Quiz (26 questions)

1. B — the format of defined electronic health care transactions.
2. B — situational.
3. B — the companion guide.
4. B — code sets and identifiers.
5. B — eligibility inquiry and response.
6. C — 278.
7. A — 835.
8. B — the file was syntactically valid.
9. B — the payer accepted the claim into adjudication.
10. B — the file followed the rules of the format, and nothing about content.
11. B — the form's data with the boxes removed.
12. B — revenue codes.
13. B — the paper CMS-1500.
14. B — a level in the hierarchy of information.
15. B — the service-line level.
16. C — the diagnosis pointers.
17. C — the referring provider's NPI.
18. B — you have a defect you will never find until something changes.
19. B — well-formed and plausible, and nothing about adjudication.
20. B — ERA enrollment, which is separate.
21. B — was never adjudicated and is not in the payer's system.
22. C — does not stop the clock.
23. B — a payer acknowledgment naming the claim.
24. B — no universal mechanism; partial solutions and persistent fax.
25. B — an eligibility answer is a lookup; a claim requires adjudication.
26. B — acceptance is not adjudication.

Exercises

Section A — What HIPAA did and did not standardize

A.1 Standard formats for defined electronic health care transactions, using the X12N implementation specifications. A.2 Standardized: the format · the segments · the element names · the order · the code sets. Not standardized: which situational elements a payer requires · what a payer does with them · the payer's own edits · how the payer names a problem · what the payer will accept as an attachment. A.3 Required · situational · not used. Situational causes the trouble, because the guide says "required when X" and payers differ on what X is. A.4 The companion guide. Ch. 14 §14.8 (bilateral conventions) · Ch. 21 §21.11 (proprietary edits) · Ch. 25 §25.9 (required fields). A.5 Standard code sets (ICD-10-CM, ICD-10-PCS, CPT, HCPCS Level II, CDT) and standard identifiers (NPI, EIN). A.6 Chapters 7 through 20. A.7 The transaction, the code set, or the identifier. A terse message may not distinguish a terminated CPT code from a Type 2 NPI in a rendering field from a malformed date — and knowing there are three different things that can be wrong is most of the diagnosis. A.8 A version change of the adopted standards, requiring simultaneous change by every payer, provider, vendor, and clearinghouse, with a compliance date everyone must hit together. It changes what elements exist and what is required. A.9 They add requirements on top of the standards, chiefly about what a response must actually tell you. They exist because "compliant" and "useful" turned out to be different things — an eligibility response saying "active coverage" and nothing about the deductible satisfies a format and answers none of Ch. 24's questions.

Section B — The transaction set

B.10 270 · 271 · 276 · 277 · 278 · 835. B.11 The professional, institutional, and dental claim transactions. B.12 The 999 is the implementation acknowledgment — was the file syntactically valid. The TA1 is the interchange acknowledgment — was the envelope readable. B.13 The 277CA is a claim acknowledgment: did the payer accept the claim into adjudication. A 277 is a claim status response. Exams use the similarity deliberately. B.14 Odd asks, even answers. B.15 The 835; Chapter 28. B.16 The enrollment transaction, employer to plan. A biller cares because it is why an eligibility answer can be wrong — coverage information reaches the payer through it. B.17 A 277. It does not contain the CARC and RARC codes, which arrive on the 835 (Ch. 28 §28.4). B.18 The 270/271. B.19 278 and 276. B.20 TA1 · 999 · 277CA.

Section C — The 837

C.21 "…the form's data with the boxes removed." C.22 Revenue codes · the circumstance code families (condition, occurrence, occurrence span, value) · and the institutional claim's own structures generally. (Ch. 26 §26.4, §26.6.) C.23 Diagnosis pointers per service line. The institutional claim links diagnoses to the claim rather than to each line, which is why Ch. 26 has no pointer discussion. C.24 No. The practical limit is the payer's and it is far higher. A system that says a claim must be split is likely imposing the paper form's limit on a transaction that does not have it — ask whether it is the payer's rule or the software's. C.25 SV101-3 through SV101-6. The four-modifier rule is in the transaction, not a paper limitation — which is why modifier 99 exists. C.26 A loop is a level. A segment is a line of data inside a loop. A data element is one field inside a segment. C.27 "At the service-line level, the diagnosis pointers." C.28 "At the subscriber level, in the name segment, the identifier is missing" — item 1a, the insured's ID number.

Section D — Reading a rejection

D.29 2300 HI = item 21, the diagnoses · 2400 SV102 = item 24F, the line charge · 2310A NM109 = item 17b, the referring provider's NPI · 2010AA NM109 = item 33a, the billing NPI · 2400 SV101-3 = item 24D's first modifier position. D.30 Qualifier HC (HCPCS) · code 99214 · modifier 25 · charge 185.00 · units 1 (basis UN) · pointers 1:2:3:4. D.31 No — the same information. Item 24E uses letters A–L; the transaction uses positions in the HI segment as numbers. A biller who learned pointers as letters should recognize them as numbers. D.32 That the position exists and is unpopulated. Every position is always there; it is the value that is absent — which is why a payer can reject an element you never filled in. D.33 The principal diagnosis in item 21 is not a valid code. Likely causes: a deleted code (Ch. 20 §20.1's quarterly updates) or a lookup error (Ch. 8). D.34 A modifier in item 24D's first position is not a valid modifier value. It does not say the modifier is inappropriate — a payer rejecting an invalid modifier says the value is not a modifier; a payer denying modifier 25 says it disagrees. Ch. 14 versus Ch. 29, arriving on different transactions. D.35 The subscriber's date of birth is missing. A registration failure (Ch. 24), fixable in thirty seconds on the day it arrives. D.36 A service line points at a diagnosis that is not on the claim. The transaction can tell that a pointer refers to nothing. It can never tell that a pointer refers to the WRONG thing — and only the second kind costs a denial. D.37 Item 17 should be blank — nobody referred her (Ch. 25 §25.10). A system auto-populating the performing physician creates this rejection out of nothing; the fix is to empty the field. D.38 (1) Is there supposed to be a referring provider at all? (2) Is the NPI a Type 1? (3) Is it ten digits and does it check-digit? (4) Is the provider in the payer's file? The fourth cannot be fixed by billing — it is a credentialing matter, and resubmitting will not change it.

Section E — Clearinghouses and enrollment

E.39 An intermediary that accepts claims from providers, validates and formats them, routes them to the correct payer, and returns acknowledgments and remittances. Even with a standard format, a practice billing sixty payers would need sixty connections, enrollments, and credential sets. E.40 Connectivity · validation · routing · translation. E.41 The claim your system produced and the claim the payer received are not byte-identical. (1) You cannot reproduce the payer's copy from your system — Ch. 25 CS1 lived in that gap for four months. (2) A problem your system generates never surfaces as a problem, so you have a defect you will never find. (3) The fix can be wrong — a default applied on your behalf is a guess. E.42 It is faster, and it does not consume a timely-filing day the way a round trip does. E.43 No. Passing proves the claim is well-formed and plausible. It predicts nothing about adjudication — Ch. 21's subject arriving one layer later. E.44 The companion guide is authoritative; the edit list is usually more current. Not a contradiction — read both. E.45 EDI (to send claims) · ERA (to receive the 835) · EFT (to receive the money). Per payer, not per practice. E.46 ERA enrollment. Ch. 28 §28.7's autoposting is impossible without it, and this is the most common reason a practice does not have it. E.47 The list of which payers you are EDI-, ERA-, and EFT-enrolled with. The gaps are the payers where your money and your remittance are arriving by the slowest available method — unnoticed, because the checks keep coming. E.48 Every payer enrollment must be redone · every report changes name and format · every defect the old clearinghouse was silently repairing arrives unrepaired. The third is never planned for. Instructions: run both in parallel if the contracts permit, and read the first two weeks of rejections line by line — it is the only clear list anyone gets of what their own system produces wrong.

Section F — Acknowledgments

F.49 TA1 — was the envelope readable? 999 — was the file syntactically valid? 277CA — did the payer accept the claim into adjudication? F.50 Accepted · accepted with errors · rejected. F.51 "…your claim is in the payer's system." The 999 says the file was grammatically correct; only the 277CA says the payer took the claim. F.52 Wrong member number · provider not on file · patient not found (any three of this kind). F.53 Thirty-eight transmitted; thirty-six submitted. The difference matters because a practice reading only the TA1 and 999 lines concludes all thirty-eight are with the payer — and two never will be unless somebody acts. F.54 Returned, not processed, data content error, National Provider Identifier, rendering provider. The three parts: status category code · status code · entity identifier. F.55 Because "invalid NPI" is not actionable and "invalid NPI — referring" is. A rejection naming the referring provider points at item 17b, one claim. A rejection naming the billing provider is a rejection of everything, because that value is identical on every claim you send — an emergency, not one claim's problem. F.56 How to retrieve a transmitted 837 · where the 999 and 277CA live for a claim or batch · what the report is called, who receives it, how often · retention and retrieval of old ones. Ch. 25's practice spent four months unable to answer a reasonable question because nobody had made this call.

Section G — Rejection versus denial

G.57 Never adjudicated / adjudicated · not in the payer's system / in it with a claim number · nothing to appeal / appeal rights and deadlines · correct and resubmit as new / appeal or corrected claim · timely filing keeps running / filing was met by the original. G.58 The timely filing row. It is counterintuitive because a denial is visible, tracked, worked, and appealable, and a rejection sits in a report — so the more dangerous of the two is the one that looks less serious. G.59 Because CARCs and RARCs describe adjudication decisions and a rejection was never adjudicated. It is described by the 277CA's status category and status codes — which is why denial and rejection reports cannot be merged without care. G.60 Because it never reached adjudication, so it never denied. A practice with an excellent denial rate and an unread rejection report is measuring half its failures, and the unmeasured half moves the measured one in the flattering direction. G.61 Day 1: about two to three minutes (read, correct, resubmit). Day 120: investigation, retrieval, a filing determination, and possibly a write-off or an exception request — a different order of magnitude, and sometimes the answer is nothing. The principle: a defect costs roughly its distance from the point of origin — Ch. 24 §24.1's ratio. G.62 Because it is evidence that nobody has been reading the report, which means there are others. You do not find one. G.63 (1) A payer acknowledgment naming the claim — the payer's own record. (2) A clearinghouse transmission report. (3) The practice management system's claim history. (4) A written record of a call. Most practices offer the third because it is the one on the screen, and it records an intent to send. G.64 The payer's. The only acceptance you can document is the resubmission's, dated after the window closed. Defenses: work rejections within days, and know your shortest window — the ninety-day payer is the one that will cost you money.

Section H — Attachments, modes, status

H.65 The 275 exists with incomplete adoption · esMD handles Medicare records requests and is not a general attachment solution · payer portals and clearinghouse attachment services work and are not standardized · and a great deal still moves by fax. H.66 The claim is submitted electronically and the document is faxed or mailed; both arrive; neither references the other in a way the payer's system can act on. Defenses: identify the document (claim number, or patient/provider/dates) · use the payer's stated method · record the submission. H.67 Batch accumulates claims and transmits a file, typically nightly. Real time sends one transaction and answers in seconds. Claims are batch and eligibility is real time because an eligibility answer is a lookup and a claim requires adjudication against benefits, edits, provider files, and history. H.68 A claim with no acknowledgment and no remittance after a reasonable interval, and confirming status before working a claim. H.69 It generates enormous volume and answers a question the 835 will answer anyway; some payers throttle it. The sharper criticism: it substitutes for reading acknowledgments you already have — a practice running status inquiries on claims whose 277CA rejections it has not opened is asking the payer about claims the payer never received. H.70 Read acknowledgments daily; use the 276 for claims genuinely unaccounted for.

Section I — The Encounter through the pipeline

I.71 Day 0 (Tue, Mar 14) service, charge capture, \$30.00 copay, note signed 6:42 p.m. · Day 1 (Wed, Mar 15) coder reviews, codes assigned, claim built, pointers set · Day 2 (Thu, Mar 16) scrubber clean, 837P transmitted 11:05 p.m. · Day 3 (Fri, Mar 17) 999 accepted, 277CA accepted. I.72 The note and the charges — but no claim. It is the most consequential day because every fact the claim will assert was created on it. I.73 11:05 p.m., in the nightly batch. It tells you most of the three days is waiting for a batch and for a coder, not processing. I.74 No. Acceptance is not adjudication — the 999 and 277CA confirm a valid file and a received claim, not a payment decision. I.75 The scrubber checked the claim against rules, the clearinghouse checked the file against a format, and the 277CA confirmed receipt. None of them evaluated whether this payer, on this contract, will pay an E/M with modifier 25 on the same day as a minor procedure. I.76 Because the fourteen days between acknowledgment and remittance dwarf it. A day saved at submission is real and small; the elapsed time lives elsewhere.

Chapter 28 — Answer Key

Quiz (26 questions)

1. B — 835.
2. B — explanation of benefits.
3. B — a group code, a CARC, and an amount.
4. B — charge equals paid plus the sum of the adjustments.
5. B — the provider absorbs it under the contract and may not bill the patient.
6. B — coinsurance.
7. B — coordination of benefits.
8. B — silent revenue loss with no error message.
9. B — a contract violation and possibly a compliance matter.
10. B — the contractual adjustment.
11. B — the benefit is included in the payment for another service already adjudicated.
12. B — it says information is missing without saying what.
13. B — incidental to the primary procedure.
14. B — at the line level.
15. B — it carries the group code, CARC, and RARC that explain why.
16. B — money that was never collectible under the contract.
17. B — looks paid in full, with nothing in any denial log or work queue.
18. B — ERA enrollment, which is separate and per payer.
19. C — see an underpayment.
20. C — arrives as a payment and appears on no exception report.
21. B — raising it.
22. B — building the expected allowed amount per line from the contract.
23. B — systematic; a configuration applying to every claim of that type since it was made.
24. B — post claims in full and post the offset as a separate provider-level transaction.
25. B — not yet the patient's.
26. B — CO-45 of \$56.60 and CO-97 of \$128.40.

Exercises

Section A — The remittance

A.1 Remittance advice (general) · ERA (electronic) · SPR (standard paper). A.2 The 835. A.3 The ERA is machine-readable and can be posted automatically; the SPR must be keyed or scanned. That is the whole practical difference and it is a large one. A.4 Check/EFT · claim · service line · (and) provider-level adjustments. A.5 The payment amount. A.6 A group code, a CARC, and an amount. A.7 Charge = paid + the sum of the adjustments, on every line. A posting that does not balance means an adjustment has been missed — and the missing one is frequently the interesting one. A.8 FL 3a, the patient control number. It makes autoposting possible. A.9 The 837 is the claim going out; the 835 is the remittance coming back.

Section B — The EOB

B.10 The remittance goes to the provider; the EOB goes to the patient. B.11 Different purposes (a benefit vs. a payment) · the charge is prominent · "you may owe" is an estimate · it arrives on its own schedule. B.12 The benefit — what the plan covered, the member's cost sharing, the deductible consumed, the maximum remaining. None of it is yours. B.13 Because it is the largest number on the page, and the patient does not know a charge is not a price (Ch. 23). B.14 No. The plan does not know what the practice collected at check-in, what a secondary will do, or whether the practice will bill at all. B.15 Date of service and provider · amount billed · allowed/eligible expense · plan paid · deductible, coinsurance, copay applied · running deductible and out-of-pocket accumulators · reason/remark · "what you may owe." The accumulators — you do not have them, and a deductible not yet met on the date of service is frequently why a bill is bigger than expected. B.16 (1) "Let's look at the same claim" — start with the number the patient is holding. (2) "You paid \$30.00 on March 14; here is where that shows"* — **this resolves it nine times in ten.** (3) *"Your plan's document is an explanation of benefits, not a bill."* (4) *"The remaining \$17.58 is coinsurance on the injection, the drug, and the lab draw."

Section C — Group codes

C.17 CO contractual obligation · PR patient responsibility · OA other adjustment · PI payer initiated reduction. C.18 The group code decides who owes; the CARC decides why. C.19 No for CO. Yes for PR. C.20 PR-1 deductible · PR-2 coinsurance · PR-3 copay. C.21 Coordination of benefits. C.22 The ABN (Ch. 22 §22.7), and the modifiers GA / GX / GY / GZ. C.23 A balance the patient owed has been written off. Nobody notices, because a contractual adjustment is exactly what a contractual adjustment is supposed to look like — and it is invisible even to an audit of the claim, because nothing about the claim is wrong. C.24 A patient has been billed for money the contract says they do not owe. Worse because it is a contract violation, may violate state balance-billing protections, and at scale is a compliance matter rather than a billing error (Ch. 32 §32.4). C.25 A posting rule mapping a CARC to a destination without checking the group code. Ch. 27's Case Study 2 — a configuration making an assertion nobody chose. C.26 Pull a month of adjustments by group code and reason code and look for any CARC appearing under more than one group code. It works because a CARC's meaning does not change with the group code — where one appears under two, one of them is coming from a rule rather than from the remittance.

Section D — CARCs and RARCs

D.27 A CARC states why an amount was adjusted; a RARC provides additional explanation. The CARC carries the amount. D.28 CO-45 charge exceeds the contracted amount · CO-97 the benefit is included in another service's payment · CO-16 lacks information needed for adjudication · CO-18 duplicate · CO-29 filing limit expired · CO-151 the information does not support this many services. D.29 N19 procedure code incidental to the primary procedure · MA130 incomplete or invalid information, no appeal rights. D.30 Because "lacks information" names nothing. The RARC names the missing element. D.31 It converts every CO-16 into a phone call, and it is your report's configuration — a settings problem masquerading as a payer problem. D.32 "The office visit was part of the injection." D.33 It is wrong because Ch. 15 §15.5 documented three chronic conditions separately assessed and Ch. 14 §14.4's modifier 25 is on the line asserting exactly that. D.34 "Line 1 denied" leads to resubmission or a write-off. The sentence leads to an appeal that wins. D.35 CO-16/M76 — a diagnosis is missing or invalid; correct and resubmit as a corrected claim, not an appeal, because nothing was decided about the service. PR-204 — not a benefit of this plan; the patient is held liable, and Ch. 22 §22.7 decides whether you may actually collect (GA yes, GZ no). CO-29 — filing expired; before writing it off, ask whether the claim was REJECTED earlier and resubmitted late, because that makes it a preventable administrative write-off with a name attached. CO-151 — a units or frequency assertion; check the units against the documentation first, because the two possible findings go in opposite directions. D.36 One. A practice that routes all denials to one queue and works them the same way is doing three of these four wrong.

Section E — Posting

E.37 Charge − CO − OA/PI − PR = payment, and charge − allowed = the contractual adjustment; allowed − patient responsibility = the payment. E.38 Because every later question is a line-level question: Ch. 29's root cause, §28.8's underpayment detection, Ch. 36's quality reporting. E.39 Systems that compute an expected contractual adjustment and post the difference. It destroys §28.8's detection, because your expectation is supposed to be the thing being tested against the remittance rather than the thing being recorded. E.40 Because they carry the group code, the CARC, and the RARC — a process that skips them has skipped precisely the lines that need attention. E.41 Nothing. The payer adjudicates the claim and reports a PR adjustment for the copay; it does not know or care that you already have the money. E.42 It must apply the existing payment against the new patient responsibility. If it does not, a second balance is created and the patient is billed for something already paid — a posting sequence problem, not a philosophy problem. E.43 Because a mismatch found before posting is a question; found after, it is an investigation. E.44 150.00 − 71.40 − 15.72 = 62.88 ✓. Bill the patient \$15.72** and nothing else. **E.45** **An underpayment of \$6.40 on the allowed amount. Nothing denied, nothing was flagged, and the line balanced perfectly — a line can be internally consistent and wrong.

Section F — Adjustments versus write-offs

F.46 The difference between the charge and the contracted allowed amount. It was never collectible. F.47 A decision to stop pursuing money you were entitled to collect. Somebody decides it. F.48 Because contractual adjustments belong in the denominator adjustment and write-offs are performance (Ch. 23 §23.9). Posting everything as "adjustment" makes the collection rate uninterpretable. F.49 The account looks paid in full. The claim balances; the patient owes nothing. Nothing appears on an aging report, in a denial log, or in a work queue. F.50 "…a write-off." F.51 Contractual · administrative (preventable) · small balance · charity/financial assistance · bad debt. F.52 Administrative (preventable) — they are the practice's own failures, priced. Ch. 29 §29.7 builds the report. F.53 Because they are different things: charity is a policy decision about a patient's ability to pay; bad debt is a failure to collect from someone who could. Mixing them misstates both, and financial assistance reporting depends on the separation (Ch. 32 §32.8).

Section G — Autoposting and underpayments

G.54 Volume accuracy · speed · consistency. G.55 ERA enrollment. An enrollment gap — somebody enrolled to send claims and never enrolled to receive the remittance. G.56 It posts denials as adjustments · applies group codes from rules · cannot see an underpayment · handles the exceptions worst. G.57 Where autoposting routes what its rules cannot classify. It contains the interesting items by construction — offsets, unmatched payments, reversals, unclassifiable denials. It is unowned because it is not anybody's job, it generates no alert, and payments still post every day it is not worked. G.58 "Who works it and how many items are in it right now?" and "What is the oldest item?" The second is diagnostic — in a healthy practice it is measured in days. G.59 It does not deny · does not reject · appears on no exception report. It arrives as a payment. G.60 Because the net collection rate is payments over what you should have collected, and "should have collected" is normally computed from the allowed amount the payer reported. A low reported allowed amount shrinks the denominator along with the numerator, so the ratio improves. G.61 Expected allowed · actual allowed · variance · threshold · classify. Step 1 is the whole difficulty, because it requires the contracts in a computable form. G.62 Because not one line is at the blend. 133.03% / 124.21% / 115.44% / 100.00%, blended 128.55% — a blended check finds every line wrong and no line wrong. G.63 Contract loaded wrong · claim wrong · payer wrong. Contract is most common on a first pass. Payer produces recovery and is systematic — it is a configuration, applying to every claim of that type since it was made. G.64 \$6.40 × 40 = **\$256.00/month → \$3,072.00/year**; over 26 months, **\$6,656.00. The duration represents how long the payer's configuration has been wrong, and recovery is bounded by the contract's reconsideration window**, not by when you noticed.

Section H — Offsets, reversals, and the balance that moves

H.65 A takeback is a payer recovering a prior overpayment; an offset is the mechanism — reducing a future payment instead of requesting a check. They appear in the provider-level adjustment section. H.66 Interest on late claims · capitation payments · penalties · advance payments and their recovery (also acceptable: balance-forward mechanics). H.67 \$612.40 was offset against a prior overpayment. Post every claim at its full remitted amount, post the offset as a separate provider-level transaction referencing the original claim, then reconcile. H.68 Dozens of accounts carry small false balances · the original overpaid claim is never corrected · §28.8's detection reports variances on every line of that remittance, which is noise you generated. H.69 A reversal carrying the original amounts inverted, followed by the corrected adjudication. Posting only the correction doubles the payment; stopping at the negative leaves the claim unpaid. H.70 The primary adjudicates and produces a PR balance → that balance is not yet the patient's → the secondary receives the claim with the primary's remittance information and applies its benefit → what remains is the patient's. H.71 Billing the patient after the primary (the most common improper patient bill) · not billing the secondary at all · assuming crossover where it does not happen. H.72 Because a QMB may not be billed for Medicare cost sharing (Ch. 3). It is prohibited, not merely awkward.

Section I — The Encounter's first remit

I.73 Day 17, Friday, March 31. \$70.30.** **I.74** L1 185.00 − 128.40 − 56.60 = **0.00** ✓ · L2 150.00 − 71.40 − 15.72 = **62.88** ✓ · L3 18.00 − 11.72 − 1.26 = **5.02** ✓ · L4 14.00 − 11.00 − 0.60 = **2.40** ✓. **I.75** **CO-45 \$56.60 (the spread between the \$185.00 charge and the \$128.40 allowed) and CO-97 \$128.40** (the entire allowed amount taken away as bundled). **The payer priced the visit and then declined to pay for it** — not a contradiction, but how a bundling denial looks on a remittance. **I.76** **\$128.40, not \$185.00, because **you are owed the allowed amount, not the charge** (Ch. 23 §23.7). **I.77** **Payment posted \$70.30 · patient responsibility created \$17.58 · open denied amount \$128.40. I.78 Nowhere. The E/M line paid nothing and produced no PR-3, because the payer never adjudicated a copay on a visit it never paid. The \$30.00 stays on the account as a credit. **I.79** **Day 66**, when the second remittance pays the E/M **\$98.40 and reports the \$30.00 as PR-3.** **I.80** (1) **The account did not look broken** — three lines paid, the arithmetic balanced, an EFT arrived. (2) **The \$128.40 had to be routed somewhere on purpose — posted as a contractual adjustment it disappears; posted as a denied amount it becomes Ch. 29's day-20 work item and Ch. 30's day-24 appeal. (3) Nothing in the pipeline could have prevented it. A process recording "payment received" would have been telling the truth and would still have lost \$128.40 — which is the chapter's argument that posting is a decision, not a record.

Chapter 29 — Answer Key

Quiz (26 questions)

1. B — is an adjudication decision with appeal rights.
2. B — rejections, which never generated a remittance line.
3. C — four.
4. B — another practice's claim.
5. B — whether the money can still be obtained.
6. C — hard and preventable.
7. B — time.
8. B — deadline.
9. B — what produced the denial.
10. C — five.
11. A — one.
12. C — three.
13. C — a catch-all "other."
14. B — worked, resubmitted, and denied again indefinitely.
15. B — one investigation.
16. B — closed, categorized, and removed from the queue.
17. B — 7.
18. D — 8.
19. B — forfeit the appeal rights attached to the original determination at some payers.
20. B — root cause and outcome.
21. B — a category is unwinnable.
22. B — a category with a zero-percent success rate.
23. A — 25% by line and 100% by claim.
24. B — 43% of denials.
25. B — answering the question it asks.
26. B — this payer denies this pairing predictably, and a process could have stopped it.

Exercises

Section A — Denial versus rejection

A.1 A denial is an adjudication decision not to pay: the payer received the claim, processed it, and decided. A rejection is a claim that never reached adjudication — it failed at the clearinghouse or the payer's front end. A.2 The denial has appeal rights. The denial stopped the timely filing clock; a rejection never did. A.3 A rejection is corrected and resubmitted as a new claim; a denial as a corrected claim (item 22 / frequency 7). Swapping them produces a duplicate in one direction and an unappealed loss in the other. A.4 A rejection arrives in an acknowledgment report (Ch. 27 §27.6); a denial arrives on a remittance. A.5 Rejections are not in it, because a rejection never generated a remittance line — so a well-run denial operation can still lose claims steadily. Ch. 27's Case Study 1. A.6 The person who works denials also works rejections, and both counts appear on the same report. A.7 Because they arrive on different clocks — a rejection surfaces within days of submission, a denial when the payer adjudicates (fourteen days later for Account 10-4471). A daily task and a weekly one should not be scheduled as one job.

Section B — The taxonomy

B.8 Eligibility (front end) · authorization (front end) · coding (coder or edit) · documentation (the note) · timely filing (the process) · coverage/necessity (policy) · duplicate (the workflow). B.9 Four. Eligibility and authorization, which routinely outnumber every coding denial combined. B.10 Duplicate — it frequently means somebody else's claim (Ch. 17 CS2). B.11 As member not found, coverage terminated, not covered under this plan, or an OA group code pointing at another payer. The tell is that nothing about the claim is wrong. B.12 A SCOPE problem — the authorization exists and does not cover what was done. Ch. 24 §24.6: the number without its scope is a number, not a record. B.13 Code selection · modifier · units. They have different owners and different fixes. B.14 It is the only family where the claim may be entirely correct and the answer still lives in a chart. B.15 CO-29 timely filing · process · almost never winnable. CO-197 authorization · front end · rarely winnable after the fact. PR-204 coverage/benefit · policy · not winnable by argument. CO-18 duplicate/workflow · workflow · usually resolvable. CO-16 with an invalid rendering provider ID credentialing · not billing · not winnable by anyone in the billing office. CO-50 documentation or coverage · requires reading the record. B.16 CO-50 is the one worth an argument on the merits. The CO-16 credentialing item belongs to a different department. B.17 "Was this claim rejected earlier and resubmitted late?" If so it is a preventable administrative write-off with a cause, not a contractual one.

Section C — Hard, soft, preventable

C.18 Hard/soft = whether the money can still be obtained. Preventable = whether the practice could have stopped it. C.19 (See §29.3's grid.) Soft/preventable: missing modifier, wrong POS. Soft/not: an unpredictable payer edit, retroactive eligibility change. Hard/preventable: timely filing, no authorization obtained. Hard/not: a genuinely non-covered service, a patient never eligible. C.20 Hard and preventable — money lost entirely to process, on a claim that was otherwise correct and that nobody ever got to argue for. C.21 (See C.19.) C.22 No. Ch. 24 §24.10: the front end's failures are usually questions nobody had written down. The alternative framing is that preventability is a statement about the process, not about a person — and reporting it as the second stops the data being accurate. C.23 Time, specifically the deadline. It follows that the queue must sort by deadline. C.24 Account 10-4471. The code, modifier, and documentation were all correct and the appeal was won — and a scrubber rule would have stopped the denial from occurring. C.25 Because a category nobody will admit to is a category nobody can fix — practices systematically under-record preventability when it is heard as blame.

Section D — Root cause and triage

D.26 The remedy is what you did about this claim; the root cause is what produced it. D.27 It records "corrected and resubmitted" — true, useless, and it will happen again, because the remedy is not the cause. D.28 Training (Chs. 13–14) · template (Chs. 4, 15) · edit (Chs. 21, 27) · payer policy (external) · chargemaster (Ch. 26 §26.5). D.29 Bundled · not a benefit at all · not recognized by this payer · not medically necessary as documented. Only the fourth is arguable. D.30 Indicator 0 → do not appeal · indicator 1 with supporting docs → appeal · indicator 1 without → do not appeal, correct · MAI 2 → do not appeal · MAI 1 or 3 → workable · proprietary → get the policy first. Three say do not appeal. D.31 Coded wrong (fixable) versus never going to be covered (not fixable by coding; the question is whether the patient was told in advance). D.32 Four reasons → edit branch → necessity test. About ninety seconds. D.33 It is not that it wins appeals. It is that it stops you writing the ones that cannot be won, which frees time for the ones that can. D.34 (See §29.4's list of fifteen.) D.35 Because a catch-all collects a third of everything, and the third it collects is the interesting third. D.36 Because it is not fixable by billing. A credentialing denial routed to a biller will be worked, resubmitted, and denied again indefinitely. D.37 Because a list assuming every denial is your fault leaves §28.8's payer findings nowhere to go, and they will be miscategorized as coding problems. D.38 A terminated HCPCS, an unaccepted revenue code, or a required-HCPCS line with none mapped. The denial names the line, not the cause — a chargemaster problem wearing a claim's clothes.

Section E — Working the queue

E.39 Deadline · category · dollar. E.40 Because §29.3's expensive quadrant is created by time, not difficulty. A \$2,000 denial with sixty days left is safer than a \$180 denial with four. E.41 Because twelve denials with the same reason code from the same payer are one investigation — working them individually costs twelve times as much and produces no root cause. E.42 Close them immediately, categorize them, and report them. RARC MA130 says explicitly that there are no appeal rights. E.43 Read the remittance codes · run the triage · classify the root cause · decide · act and record both · report the pattern if it is larger than the claim. E.44 Because afterwards you will remember the remedy — classifying after acting produces a log full of remedies. E.45 Report a pattern, not an instance, to somebody who can change the process — Ch. 21 §21.10. E.46 How many items · what is the oldest and why · how many closed as "no action" · what is in here that nobody in this department can fix. E.47 The team closed 138 and resolved 49 — measure resolved, not worked. And "no action: 0" means nothing is being closed as unwinnable, so the queue is overstating recoverable work. E.48 Yes. Descending-by-charge makes the deadline invisible and lets hard, small, or old items sink. The 287-day item is a symptom of the sort order, not of capacity.

Section F — Corrected claims

F.49 Professional: item 22, code 7 to replace, code 8 to void. Institutional: FL 4 frequency 7 to replace, 8 to void. F.50 A duplicate — the payer has two claims, denies the second, and the original problem is unfixed. It is the same failure because both fields do the same job on their respective forms. F.51 Replace when the claim should exist and be different. Void when it should not exist at all — wrong patient, wrong provider, wrong date. F.52 The original claim number, which returns on the remittance (Ch. 28 §28.1). F.53 A corrected claim says "here is different information." An appeal says "your decision was wrong about the information you had." F.54 It can restart timely filing arguments and, at some payers, forfeit the appeal rights attached to the original determination. F.55 Units → correct and resubmit, coding-units. CO-97/N19 with documentation → appeal, edit-payer. No authorization on a completed service → usually close (hard, preventable); ask about retroactive authorization first, authorization. Duplicate with no internal match → investigate outward, duplicate/workflow. MA130 → close, and categorize. Not enrolled → escalate out of billing, credentialing.

Section G — The log and the numbers

G.56 DOS · denial date · payer · provider · code and modifiers · charge and allowed · group code · CARC · RARC · root cause · preventable? · action · outcome · date resolved. G.57 Root cause and outcome. They are what turn individual claims into knowledge about a practice. G.58 (Definitions per §29.7.) G.59 Because the two numbers are identical until a category is unwinnable, and that is exactly where you need to look. A team that worked 400 and resolved none was fully occupied by the wrong measure. G.60 It means reporting the overturn rate per category rather than in aggregate. An average of a winner and a loser tells you about neither, and it concealed a zero-percent category for a year. G.61 Because rejections never reach adjudication and so never deny — Ch. 27 CS1's denial rate improved every month the practice lost more money. G.62 The practice's own process failures, priced in dollars. Ch. 28 §28.6 created the category for this report. G.63 Lines or claims · zero-pay only or any non-contractual adjustment · adjudicated or submitted. G.64 25% by line; 100% by claim. G.65 Because a line paid at a reduced rate with a CO-151 was partially denied and would not be counted. G.66 Pick one definition and write it down; never change it silently · report lines for operational work · treat external benchmarks as comparisons of definitions. G.67 Because the published rate was computed under somebody else's three choices. §29.9 recommends comparing yourself to yourself. G.68 6.4% (267 ÷ 4,180) · registration 71 + authorization 44 = 115 of 267 = 43% · 69.3% preventable (185 ÷ 267) · overturn 57 ÷ 84 = 67.9%, reported as 68%. ✓

Section H — Prevention and the case for it

H.69 The front end (eligibility, authorization, registration accuracy) · the template (documentation) · the edit (the scrubber). H.70 The template — it improves the record rather than the claim. H.71 A modifier denial is preventable at the edit only if the information needed is on the claim. When the answer is in the note, it is a template problem wearing an edit's clothes, and a scrubber rule for it stops claims it cannot resolve. H.72 It must tell somebody what to do. Otherwise it converts a denial into a held claim — better, and not free. H.73 A denial costs you every time it happens. An edit costs you once. H.74 An edit may stop a claim and ask a question; it may not answer it. Acceptable: "modifier 25 may be required — has a separately identifiable service been documented?" Unacceptable: a rule that appends modifier 25. H.75 \$25,720.80. Eleven of forty-two were in fact separately documented and defensible, but had not been documented that way at the time and could not be proved after the fact. H.76 A dollar figure for a period · name the process, not the person · the smallest possible fix · a comparison rather than a benchmark · ask for a measurement rather than a commitment. H.77 Because a benchmark from a source nobody trusts becomes an argument about the benchmark, and a category that is being measured usually improves before anything changes — which is not a trick, since measuring it is itself a process change. H.78 Worth something: ask what would change the answer (a stated threshold converts a refusal into a condition) · keep the measurement running · do the part you control. Not worth anything: escalating past the person who declined, early — it converts a priorities disagreement into an authority conflict. Write it down because a dated record of a declined correct analysis is how the finding gets acted on eighteen months later.

Section I — The Encounter's CO-97

I.79 Day 20, Monday, April 3. I.80 CO — the patient may not be billed. 97 — the service is included in another service's payment. N19 — incidental to the primary procedure. "The payer has asserted that the office visit was part of the injection." I.81 Bundled, which would ordinarily end the analysis with nothing to appeal. I.82 Modifier indicator 1 — a modifier may override. The claim carries modifier 25. So the question is whether the documentation supports the override, and the branch concludes APPEAL, quoting the Policy Manual. I.83 Three chronic conditions each separately assessed with a plan · prescription drug management, three medications reviewed and continued · two laboratory tests ordered with stated clinical reasons · a new problem with its own history, examination, and independent management decision. Elements 1 through 3 have nothing to do with the knee. I.84 Root cause: EDIT — PAYER ("E/M with minor procedure, same day"). SOFT. Decision: appeal. I.85 14 + 31 + 13 = 58 minutes. I.86 Both are true because "preventable" means a process could have stopped it, not that anyone was wrong. The claim was correct at every step and won on the merits; this payer denies this pairing predictably, so a scrubber rule recognizing the pattern and attaching supporting detail — or a template placing the three chronic conditions where a reviewer would see them — would have changed the outcome without changing the claim's correctness.

Chapter 30 — Answer Key

Quiz (26 questions)

1. B — the allowed amount.
2. B — forfeit the appeal rights attached to the original determination.
3. C — a phone call, four more documented weeks, and resubmission.
4. C — proof the claim was filed on time, such as a payer acknowledgment.
5. B — the specific, executable request.
6. B — a reviewer who has read the rule reads your facts as evidence rather than as a story.
7. B — the note, the NCCI Policy Manual, and the payer's own published policy.
8. B — only the demonstration is new work; citations live in a maintained paragraph library.
9. B — uses only facts already documented, arranged so their consequence is visible.
10. B — amendments are dated and attributed, and a reviewer will discount the note or refer the file.
11. C — the date of the determination being appealed.
12. B — ERISA and the DOL claims-procedure regulation.
13. C — the plan participant; the provider typically acts as authorized representative.
14. B — redetermination, reconsideration, ALJ, Council, judicial review.
15. B — the MAC, by staff not involved in the initial determination.
16. B — 120 and 180 days.
17. C — the ALJ hearing.
18. B — all evidence by the reconsideration; later evidence excluded absent good cause.
19. B — moving the appeal to the next level when the current level misses its decision timeframe.
20. C — the treating physician.
21. B — the gap, named.
22. C — medical judgment.
23. C — four months from the final internal adverse determination.
24. B — forwarded automatically to an independent review entity.
25. B — your filing deadlines and the payer's decision deadlines.
26. D — when the money posts and the outcome flows back to the denial log.