Chapter 2: Healthcare Reimbursement: Insurance Types, Payer Contracts, Fee Schedules, and Who Pays What

"There is no such thing as what a service costs. There is only what somebody agreed to pay for it, and there are several hundred somebodies." — constructed; the working premise of this chapter

Overview

Chapter 1 said the allowed amount is the number that matters, and then treated it as if it fell from the sky.

It does not. It comes from a contract — a signed commercial agreement between a provider organization and a payer, negotiated on terms neither side is happy with, effective for a period of years, and almost never read by any of the people who spend their days working claims under it. The contract says what each service is worth. It says how quickly the payer must pay. It says what the provider may and may not bill the patient. It says who wins a dispute and how.

Layered on top of the contract is a second document, the benefit design, which is an agreement between the payer and the person who bought the coverage — an employer, usually, sometimes an individual, sometimes a government. The contract decides what the service is worth. The benefit design decides how that amount is divided between the plan and the patient.

Nearly every conversation you will have in a business office is about one of those two documents, and the frustrating thing is that most people having those conversations have seen neither.

This chapter fixes that. By the end of it you will be able to look at an insurance card and an eligibility response and say, before a claim is ever submitted, what the payer will allow, what the patient will owe, and where the money will get stuck. That skill has a name in this industry — predicting the adjudication — and it is the difference between a business office that reacts and one that anticipates.

In this chapter, you will learn to:

• Define the five cost-sharing terms and compute patient responsibility under any combination
• Explain what network participation obligates and what it protects
• Distinguish the plan types by the three questions that actually separate them
• Recognize a self-funded plan and say why it changes who makes the rules
• Name the five contract structures and what each one puts at risk
• Read an eligibility response and predict a claim's patient responsibility
• Determine the order of payers, including the birthday rule

Learning Paths

🎓 Certification — §2.2 and §2.8 are directly examinable and appear on every credential's billing content. The birthday rule shows up almost every time. §2.6 is background.

💼 New Coder — §2.1 through §2.3 give you the vocabulary you need to understand why a denial happened. You can skim §2.6.

💵 Biller / AR — This is your chapter. All of it. §2.7 is the single most immediately useful page in Part I, and §2.5 explains why the same insurance card behaves differently for two patients.

🏥 Practice Manager — §2.6 is the one nobody else will read and the one that determines whether your practice is financially viable. Read it twice.

2.1 What insurance actually promises

Strip away the vocabulary and health insurance is a bet, made at scale, on a simple mathematical fact: in any large group of people, most will need very little care in a given year and a few will need an enormous amount, and nobody knows in advance who will be which.

Everyone pays a premium. The pool of premiums pays the claims of the few. That is risk pooling, and it is the entire mechanism.

Three consequences follow immediately, and all three shape the work you are about to learn.

First, the plan must control what it pays for, or the pool empties. Every coverage rule, prior authorization requirement, medical necessity policy, formulary, network restriction, and edit that you will spend your career navigating exists because a risk pool that pays for everything cannot price itself. This does not make every individual rule reasonable — a great many of them are not — but it explains why the category exists, and understanding that will make you better at working within it than someone who experiences each rule as an arbitrary insult.

Second, the plan must control what it pays. Not just whether but how much. That is the allowed amount, and it is the subject of §2.6.

Third, the enrollee must have some financial stake, or utilization rises in ways the pool cannot absorb. That is cost sharing — deductibles, copayments, coinsurance — and it is the subject of §2.2.

What "covered" actually means

The word "covered" is used loosely by everyone including clinicians, and its looseness causes a specific and recurring failure.

A service is covered when it is (a) a benefit under the plan, (b) furnished to an eligible person, (c) during an active coverage period, (d) meeting the plan's medical necessity criteria, and (e) delivered in compliance with the plan's administrative requirements — authorization, network, site of service, frequency limits, and so on.

All five. A service can fail any one of them and be denied, and the five failures produce five entirely different denials with five different remedies. Chapter 29 builds that taxonomy. For now, notice that "is this covered?" is not one question and cannot be answered with one lookup.

📞 On the Phone

The word "covered" is where most patient conversations go wrong, because the patient uses it to mean "will I owe anything" and the plan uses it to mean "is it a benefit."

Patient: "They told me the MRI is covered. So why do I have a bill for eleven hundred dollars?"

Both statements are true. The MRI is a covered benefit. The patient has a \$2,000 deductible and has spent \$340 of it this year. "Covered" meant the plan would apply its negotiated rate and count the amount toward the deductible. It never meant the plan would pay.

What to say: "Covered means your plan includes MRIs as a benefit and applies its discounted rate — which it did; the imaging center charged \$2,900 and your plan's rate brought it to \$1,100. What 'covered' doesn't mean is that the plan pays it. Your plan starts paying after you've spent \$2,000 out of pocket for the year, and you'd spent \$340. So this \$1,100 goes toward your deductible. The good news, and I mean this: you're now \$1,440 into your deductible instead of \$340, and everything else this year gets cheaper."

What not to say: "Covered doesn't mean paid." True, condescending, and it ends the relationship.

2.2 Premium, deductible, copayment, coinsurance, out-of-pocket maximum

Five terms. Learn them exactly, because they are not interchangeable and patients use them interchangeably constantly.

Two structural points that resolve most confusion.

The premium is not part of the revenue cycle. It never touches a claim, it is not paid to the provider, and it does not appear on any document you will work with. Patients bring it up constantly — "I pay eight hundred dollars a month and you're telling me I owe more?" — and the honest answer is that the premium buys access to the negotiated rate and to the plan's payment after the deductible, not the care itself. Say it kindly. It is a genuinely unsatisfying answer and the patient is not being unreasonable.

Everything else is computed on the allowed amount. This is Chapter 1's rule, restated and now made precise: the deductible is satisfied by allowed amounts, coinsurance is a percentage of the allowed amount, and the out-of-pocket maximum accumulates allowed amounts. The charge never enters the calculation.

The order of operations

This trips up new billers because the order is fixed and not obvious.

APPLYING A BENEFIT TO A CLAIM LINE — the fixed order

  START:  the ALLOWED AMOUNT for the line
    │
    ├─ Is a COPAY specified for this service type?
    │     YES → subtract the copay. It does NOT go toward the deductible in
    │           most designs (check the plan — some now do).
    │     NO  → continue
    │
    ├─ Is there REMAINING DEDUCTIBLE?
    │     YES → apply the lesser of (remaining deductible) or (amount left).
    │           The patient owes this in full. Plan pays $0 on this portion.
    │     NO  → continue
    │
    ├─ COINSURANCE on whatever remains
    │     patient % and plan % of the remainder
    │
    └─ Has the OUT-OF-POCKET MAXIMUM been reached?
          YES → the plan pays 100% of everything past the ceiling.
                The patient owes nothing further this benefit period.

🧮 Run the Numbers

The same \$400.00 allowed amount, under four different benefit positions. [constructed teaching example]

Benefit: \$1,500 deductible · 20% coinsurance · \$4,000 out-of-pocket maximum · no copay on this service type.

(a) Deductible fully met, out-of-pocket maximum not reached. Coinsurance: \$400.00 × 0.20 = **patient \$80.00**, plan \$320.00.

(b) Deductible untouched (\$1,500 remaining). The full \$400.00 applies to the deductible. **Patient \$400.00, plan \$0.00.** The claim was covered, adjudicated, and paid correctly. The plan paid nothing. This is the single most common source of "my insurance denied it" phone calls, and it is not a denial.

(c) Partially met — \$140.00 of deductible remaining. Deductible: \$140.00. Remainder: \$400.00 − \$140.00 = \$260.00. Coinsurance: \$260.00 × 0.20 = \$52.00. Patient \$140.00 + \$52.00 = \$192.00. Plan \$208.00. Check: 192.00 + 208.00 = 400.00 ✓

(d) Out-of-pocket maximum reached earlier this year. Patient \$0.00, plan \$400.00.

The interpretation: four correct adjudications of the same service under the same plan, producing patient responsibility of \$80.00, \$400.00, \$192.00, and \$0.00. The allowed amount never changed. Anyone who tells a patient what they will owe without checking the accumulators is guessing.

Two design variants worth knowing

Family versus individual accumulators. Most plans have both an individual deductible and a family deductible, and the interaction between them is genuinely complicated. In an embedded design, an individual member's expenses stop once they hit the individual deductible even if the family deductible is unmet. In an aggregate design — more common in high-deductible plans — no member receives plan payment until the entire family deductible is satisfied. Two families with the same numbers on the card can have very different experiences. Always read the accumulator response, never the card.

Copay-plus-coinsurance. Many plans apply a copay to the office visit and coinsurance to everything else furnished the same day. This is exactly the structure on the Encounter, and it is why the patient in Account 10-4471 pays a flat \$30.00 on one line and a percentage on three others.

⚠️ Where Claims Die

Collecting the copay and calling it done. A front desk collects the \$30.00 copay at check-in, the patient leaves, and then an injection and a blood draw are performed and generate coinsurance the patient was never told about. Six weeks later a \$17.58 statement arrives for a visit the patient believed was paid for.

The cost is not \$17.58. The cost is the phone call, the explanation, the goodwill, and the forty-percent likelihood the balance ages past ninety days because it is too small for the patient to bother with and too small for the practice to chase. Chapter 31 §31.7 covers small-balance economics.

The fix costs nothing and takes eight seconds at check-out: "Your copay covered the visit. The injection and the lab will go through your insurance, and you'll likely see a small balance for those — probably fifteen to twenty dollars. Would you like to take care of that now, or would you rather wait for the statement?"

🔍 Check Your Understanding

1. A patient has a \$3,000 deductible with \$2,880 remaining and 20% coinsurance. A service is allowed at \$500.00. What does the patient owe?
2. Same patient, but the service is allowed at \$4,000.00 and their out-of-pocket maximum is \$5,000 with \$0 accumulated. What do they owe?
3. Why does the premium never appear on a claim?

(Answers: 1. The whole \$500.00 — it all falls within the remaining deductible. Plan pays \$0.00. 2. Deductible \$2,880.00, then 20% of the remaining \$1,120.00 = \$224.00, total \$3,104.00 — which is under the \$5,000 ceiling, so no cap applies. Plan pays \$896.00. 3. Because it is paid to the plan, not the provider, and buys eligibility rather than any specific service.)

2.3 Network status and what "in network" really buys

A participating provider — "in network," "par" — has signed a contract with the payer. A non-participating provider has not.

That single distinction changes four things at once, and it is worth separating them because people collapse them.

The first two are the important ones, and they are the same fact from two directions: the provider agrees to accept the contracted amount as payment in full, and in exchange gets access to the plan's members and a defined payment process.

Some plans — EPOs and most HMOs — have no out-of-network benefit at all except for emergencies. For those members, an out-of-network service is not "more expensive"; it is not covered, and the patient owes the entire charge. This is a genuinely brutal outcome and it happens routinely, which is why §2.4 spends time on plan types.

Assignment, and a distinction that confuses everyone

Accepting assignment is not the same thing as being in network, although the two are usually described in the same breath.

Assignment means the provider agrees to accept payment directly from the payer rather than having the payer pay the patient, who would then owe the provider. It is a payment-routing question.

Participation means the provider has signed a network contract with an agreed fee schedule. It is a pricing question.

In Medicare the two are tightly linked and carry specific meanings that Chapter 3 §3.4 covers in detail, including the limiting charge — a statutory cap on what a non-participating provider may charge a Medicare beneficiary. In commercial insurance, "assignment of benefits" is generally a form the patient signs authorizing the plan to pay the provider directly, and it is a routine part of registration.

⚖️ Compliance Check

Waiving a patient's cost sharing is not a kindness; it is frequently a violation.

Routinely waiving copayments, coinsurance, or deductibles — "professional courtesy," "we'll just write off your part" — implicates the Anti-Kickback Statute (42 U.S.C. § 1320a-7b(b)) when a federal health program is involved, because it can be characterized as remuneration to induce the beneficiary to obtain services. It can also constitute a false statement about the provider's actual charge, and it typically breaches the network contract's requirement to collect cost-sharing.

There are legitimate paths: a documented, uniformly applied financial hardship determination made case by case; a compliant financial assistance policy; and prompt-pay or self-pay discounts structured within the rules. Chapter 32 §32.8 covers them.

The distinction the OIG has drawn repeatedly is between an individualized, documented hardship determination and a routine, advertised waiver. The first is defensible. The second is not.

This is a summary of a complex area with real criminal exposure. Verify with your compliance officer and counsel; do not act on a textbook paragraph.

2.4 Plan types: HMO, PPO, EPO, POS

Four acronyms, endlessly explained badly. Here is the version that is actually operational.

Three questions separate them:

1. Is there any out-of-network coverage?
2. Is a primary care physician required as a gatekeeper?
3. Is a referral required to see a specialist?

The EPO is the one people miss. It looks like a PPO — no gatekeeper, no referrals, broad specialist access — and it behaves like an HMO on the only question that costs money: there is no out-of-network benefit. A patient who assumes their EPO is "basically a PPO" and sees an out-of-network specialist owes the whole charge.

The distinction that actually matters for billing

Plan type tells you about access rules. It tells you almost nothing about cost sharing, which is set by the specific benefit design and varies enormously within every plan type. An HMO can have a \$6,000 deductible and a PPO can have none.

So do not reason from the plan type to the patient's responsibility. Reason from the eligibility response. Plan type answers: do I need a referral, and is this provider in network for this product? Everything financial comes from the accumulators.

⚠️ Where Claims Die

"In network with the insurer" is not "in network for this product."

A large insurer may operate a dozen distinct networks: a broad PPO network, a narrow HMO network, an ACA marketplace network, a Medicare Advantage network, a Medicaid managed care network, and one or more employer-specific narrow networks. A provider can be in some and not others. The card says the insurer's name in large type and the product name in small type, and the product name is the one that matters.

This is one of the most common causes of a denial that everyone in the office is certain must be wrong — "we're in network with them, we've always been in network with them" — and the eligibility transaction would have said so in advance. Chapter 24 §24.3.

2.5 Self-funded plans and the third-party administrator

Here is a fact that is invisible on the insurance card and changes who makes the rules.

A large share of Americans with employer coverage are not insured by the company whose logo is on their card. Their employer pays claims out of its own money and hires the insurance company to administer the plan — to build the network, process the claims, and answer the phone. The insurer bears no risk. It is a third-party administrator, and the plan is self-funded (or self-insured).

FULLY INSURED vs. SELF-FUNDED — the money and the rules

  FULLY INSURED
    employer ──premium──► INSURER ──pays claims──► provider
                             │
                             └─ bears the RISK, makes the RULES,
                                regulated by STATE insurance law

  SELF-FUNDED
    employer ──────────────────pays claims from its own funds──► provider
       │                          ▲
       │                          │ administers only
       └─ bears the RISK          │
          makes the RULES    ADMINISTRATOR (TPA)
          governed by ERISA       (often a household-name insurer
          — FEDERAL law             whose logo is on the card)

Why this matters, concretely:

The benefit design can be idiosyncratic. The employer chose it. Two patients can present cards from the same insurer with the same network and have materially different coverage, because their employers bought different plans.

State insurance law generally does not apply. Self-funded plans are governed by the Employee Retirement Income Security Act — federal law — and state mandates about covered benefits, prompt payment, and external review often do not reach them. This surprises billers who have learned their state's prompt-pay statute and cannot understand why one payer ignores it.

The appeal process runs under ERISA rules, which have their own timelines and their own requirements for what a plan must give you. Chapter 30 §30.5 covers the practical differences.

And you frequently cannot tell from the card. Some cards say "administered by." Many do not. The eligibility response may say. When it matters — a large or unusual claim, an appeal, a question about whether a state mandate applies — ask the payer directly whether the plan is self-funded, and write the answer in the account notes with the date and the representative's name.

🎓 Exam Watch

Certification exams test the definitions — TPA, self-funded, ERISA, fully insured — and rarely the operational consequences. Expect a question shaped like: "An employer that pays employee health claims from its own funds and contracts with an insurance company only for administrative services has a plan that is best described as…" Answer: self-funded (self-insured).

The distractor is usually "capitated," which is a payment arrangement between a plan and a provider, not a funding arrangement between an employer and an insurer. Keep those two axes separate: who bears the risk of the population (§2.5) versus how the provider is paid (§2.6).

2.6 The contract: fee schedules, percent-of-charge, case rates, capitation

Now the document that sets the allowed amount.

A payer contract is a commercial agreement, usually running dozens of pages, of which the part everyone cares about is an exhibit at the back: the reimbursement schedule. Five structures cover nearly everything.

1. Fee schedule

The most common arrangement for professional services. A list of codes and dollar amounts. Frequently expressed not as absolute dollars but as a percentage of the Medicare Physician Fee Schedule — "115% of current-year Medicare, non-facility, by locality." That formulation is efficient (it updates automatically) and dangerous (it drops when Medicare's conversion factor drops, which it periodically does).

What it puts at risk for the provider: volume. You are paid per service, so revenue depends on doing more.

2. Percentage of billed charges

The payer allows a percentage of whatever the provider charges — "72% of billed charges." Common in some hospital contracts, in out-of-network arrangements, and in certain specialty and ancillary agreements.

This is the one case where raising the charge raises the payment, which is precisely why it is increasingly rare and why it drove decades of chargemaster inflation. Chapter 23 §23.7 tells that story.

What it puts at risk: nothing, for the provider. Which is why payers have moved away from it.

3. Case rate

A single amount for an entire episode regardless of what it took. A flat fee for a delivery, a knee replacement, a cardiac catheterization. Medicare's inpatient DRG system (Chapter 33) is a case rate at national scale.

What it puts at risk: cost per case. If the patient stays an extra three days, the payment does not change.

4. Per diem

A daily rate for an inpatient stay, sometimes tiered by level of care — so much per medical/surgical day, more per intensive care day.

What it puts at risk: intensity within the day. Length of stay is compensated; what happens during it is not.

5. Capitation

A fixed amount per member per month for every attributed patient, whether or not they are seen. Often written as "PMPM." A primary care group capitated at \$32 PMPM for 4,000 attributed members receives \$128,000 a month, and receives the same \$128,000 whether it sees 900 patients or 2,400.

What it puts at risk: everything. The provider now bears population risk. This is why capitated arrangements come bundled with quality measures, risk adjustment, and stop-loss provisions — Chapter 36 covers the machinery.

🧮 Run the Numbers

The same service under three contracts. A practice charges \$185.00 for an established patient office visit. [constructed teaching example — verify any real contract's terms]

Contract	Terms	Allowed	Contractual adj.
Payer A	Fee schedule, flat	128.40	56.60
Payer B	118% of Medicare (Medicare allows \$96.52 for this code and locality — Chapter 23 derives it)	113.89	71.11
Payer C	72% of billed charges	133.20	51.80

Payer B: \$96.52 × 1.18 = \$113.89. Payer C: \$185.00 × 0.72 = \$133.20.

Now raise the charge to \$250.00 and recompute:

Contract	Allowed	Change
Payer A	128.40	no change
Payer B	113.89	no change
Payer C	180.00	+\$46.80

The interpretation. Two of the three are completely indifferent to what you charge. One is not, and the existence of that third contract type is the historical reason charges across American healthcare drifted so far above collections. Chapter 23 §23.7 develops this. The practical rule for setting a charge is not "as high as possible" — it is "never below the highest allowed amount any payer will pay," because a payer never pays more than you asked for.

(The \$96.52 Medicare allowed amount is a constructed teaching figure, built from illustrative relative value units and a conversion factor in Chapter 23 §23.6. Verify current values in the Medicare Physician Fee Schedule for your locality — the conversion factor and the RVU file both change annually, and the conversion factor has fallen in several recent years.)

What else is in the contract

The reimbursement exhibit gets all the attention. The clauses that generate the most work are elsewhere:

• Timely filing — how long you have to submit. Chapter 1 §1.3.
• Prompt payment — how long the payer has to pay, and what happens if it does not.
• Appeal rights and deadlines — often shorter than you would expect, and frequently different from the plan's published member appeal process.
• Coding and payment policy incorporation — a clause stating that the payer's published policies are part of the agreement and may be updated unilaterally. This is how a contract signed in one year comes to include an edit written three years later.
• Audit and recoupment rights — how far back the payer may look and how it may recover.
• Amendment and termination — including whether rates change automatically with a published fee schedule.

⚠️ Where Claims Die

Nobody in the building has the contract.

This is astonishingly common. The contract was signed by a physician-owner or a system executive years ago, lives in a filing cabinet or an unnamed PDF, and the people working denials against it have never seen it. The consequences compound:

• Underpayments are invisible. If you do not know what the contract allows, you cannot tell an underpayment from a correct payment. Chapter 28 §28.8.
• Appeals are weaker. The strongest appeal argument is frequently "your own contract says X."
• Timely filing and appeal deadlines are guessed at.
• Rate erosion goes unnoticed. A percentage-of-Medicare contract quietly loses value when the conversion factor falls.

Get the contract. Extract the fee schedule for your top fifty codes, the filing and appeal deadlines, and the audit clause, and put them on one page per payer where the staff can see them.

2.7 Reading a benefit design before you bill

Here is the skill this chapter exists to build.

📋 Read the Chart

text FIGURE 2.1 — "The eligibility response" [Account 10-4471] THE DOCUMENT Eligibility and benefit response (a 271 transaction, rendered as the practice management system displays it). Requested and received at 8:12 a.m. on day 0, before the patient arrived. THE CONTEXT Established patient, scheduled 10:20 a.m. appointment, Northgate Family Medicine. This is what the front desk saw. WHAT IT SHOWS Coverage active. In-network for THIS product. Deductible fully satisfied. $30 primary care copay. 20% coinsurance on other services. Out-of-pocket maximum not reached. No referral required. No authorization required for an office visit. WHAT IT DOESN'T It does not say what any service is ALLOWED at — eligibility is not pricing. It does not say whether an injection requires authorization (it does not, but the response does not tell you that). It does not guarantee payment; every eligibility response in existence carries a disclaimer saying exactly that. And it is a snapshot: it was true at 8:12 a.m. THE DECISION Collect the $30 copay at check-in. Tell the patient at CHECK-OUT that any additional services will run through coinsurance and that a small balance is likely. THE LESSON Eligibility answers "will this be processed and roughly how will cost be split." It never answers "how much." For that you need the eligibility response AND the contract.

```text ELIGIBILITY & BENEFITS — NORTHFIELD MUTUAL HEALTH PLAN [constructed example] Inquiry: day 0, 08:12 · Trace 2E-88104-7 · Response: real time

MEMBER [redacted] MEMBER ID NFM-4408-21195-01 GROUP 7741-A PLAN PPO SELECT PAYER Northfield Mutual Health Plan FUNDING Administered — self-funded employer group ◄── see §2.5 STATUS ACTIVE EFFECTIVE 01/01 TERM none on file NETWORK Provider NPI 1▪▪▪▪▪▪▪▪▪7 IN NETWORK for PPO SELECT

── ACCUMULATORS ────────────────────────────────────────────────────── DEDUCTIBLE individual 1,500.00 met 1,500.00 remaining 0.00 family 3,000.00 met 2,140.00 remaining 860.00 OUT-OF-POCKET individual 4,000.00 met 1,835.00 remaining 2,165.00 family 8,000.00 met 2,612.00 remaining 5,388.00

── COST SHARING (IN NETWORK) ───────────────────────────────────────── OFFICE VISIT — PRIMARY CARE COPAY 30.00 OFFICE VISIT — SPECIALIST COPAY 50.00 PREVENTIVE SERVICES covered 100%, no cost share ALL OTHER PROFESSIONAL SERVICES COINSURANCE 20% after deductible DIAGNOSTIC LAB / X-RAY COINSURANCE 20% after deductible EMERGENCY ROOM COPAY 250.00 then 20%

── ADMINISTRATIVE ──────────────────────────────────────────────────── REFERRAL REQUIRED No PRIOR AUTH — OFFICE VISIT No COB ON FILE None indicated

This response is not a guarantee of payment. Benefits are subject to the terms of the plan document and to eligibility at the time of service. ```

Read that response the way a biller reads it, in this order:

1. Is coverage active on the date of service? Yes. If it were not, nothing else matters.

2. Am I in network for this product? Yes — and note that it says PPO SELECT, not just "Northfield Mutual." §2.4.

3. What are the accumulators? Individual deductible fully satisfied. That is the single most consequential line in the response for predicting this claim.

4. What is the cost-sharing structure for what I am about to do? \$30 primary care copay, 20% coinsurance on everything else.

5. Is there anything administrative in the way? No referral, no authorization for the visit.

6. What did it not tell me? Whether a specific procedure requires authorization. Whether there is other coverage the member did not disclose. And — critically — any dollar amount at all. That comes from the contract.

🧮 Run the Numbers

Predicting the adjudication of Account 10-4471, before the claim is submitted. [constructed teaching example]

From the contract's fee schedule, Northfield Mutual's allowed amounts for these codes are:

Line	Code	Charge	Allowed
1	99214-25	185.00	128.40
2	20610-RT	150.00	78.60
3	J1030	18.00	6.28
4	36415	14.00	3.00
	Total	367.00	216.28

Contractual adjustment: \$367.00 − \$216.28 = \$150.72

Now apply the benefit from Figure 2.1. Deductible is met, so no deductible applies. Line 1 is the primary care office visit: \$30.00 copay. Lines 2, 3, and 4 are "all other professional services" and "diagnostic lab": 20% coinsurance.

Line	Allowed	Patient	Plan
99214-25	128.40	30.00 (copay)	98.40
20610-RT	78.60	15.72	62.88
J1030	6.28	1.26	5.02
36415	3.00	0.60	2.40
Total	216.28	47.58	168.70

Checks: \$367.00 − \$216.28 = \$150.72 ✓ · \$216.28 − \$47.58 = \$168.70 ✓ · \$30.00 + \$15.72 + \$1.26 + \$0.60 = \$47.58 ✓

A note on rounding. Line 3's coinsurance is 20% of \$6.28 = \$1.256. Rounded at the line, it is \$1.26. Computed in aggregate — 20% of (\$78.60 + \$6.28 + \$3.00) = 20% of \$87.88 = \$17.576 → \$17.58 — it agrees. It will not always agree. Round at the line, in the same order the payer does, and reconcile to the remit rather than to your own arithmetic.

The interpretation. Before this claim was submitted, on day 1, the practice could have known that the patient would owe \$47.58** and the plan would pay **\$168.70. Nothing about that prediction requires the claim to have been adjudicated. It requires the eligibility response and the contract, and the practice had both.

What the prediction cannot tell you is whether the plan will actually pay \$168.70. It will not. One line will be denied. That is Chapter 29's problem, and it is worth noticing now that a perfectly good prediction of the benefit tells you nothing about the payer's edits.

2.8 Coordination of benefits and the order of payers

When a patient has more than one plan, the plans have to decide which pays first. Coordination of benefits is that ruleset, and getting the order wrong produces a specific and very common denial: CARC 22, "this care may be covered by another payer per coordination of benefits."

The primary payer processes the claim as though it were the only coverage. The secondary payer then processes it against what remains, subject to its own rules — which may or may not cover the patient's remaining responsibility.

The order

The rules are set out in a model regulation that most states have adopted in some form, and by federal law for Medicare. The common cases:

The birthday rule

For a dependent child covered by both parents' plans, where the parents are married or living together: the plan of the parent whose birthday falls earlier in the calendar year is primary.

Not the older parent. The one whose month and day come first. A parent born March 3, 1988 is primary over a parent born November 12, 1979.

If both parents share the same birthday, the plan that has covered the parent longer is primary.

🎓 Exam Watch

The birthday rule appears on essentially every billing-related certification exam, and the distractor is always the older parent. Expect a stem like: "A child is covered under both parents' plans. The mother's date of birth is 08/14/1985 and the father's is 04/02/1979. Which plan is primary?"

Answer: the father's, because April precedes August. The year is there to make you choose the older parent, and choosing the older parent is wrong. Read the month and day only.

A second reliable exam point: the birthday rule applies to dependent children of parents who are married or living together. If the stem says divorced, a different rule applies and a court decree controls if there is one.

⚠️ Where Claims Die

COB denials are almost always a registration failure, not a billing failure.

The most common version: the patient has secondary coverage they did not mention, or the plans' records of the COB order disagree with reality because nobody has updated them. Payers periodically send COB questionnaires to members; members do not return them; the payer suspends claims until they do.

The fix is almost never on the provider's side. It is a phone call to the member, asking them to call their plan and update the coordination-of-benefits information. A biller who tries to fight a COB denial with the payer instead of routing it to the member can lose weeks.

The prevention is one question at every registration: "Do you have any other health coverage, including through a spouse, a parent, or Medicare?" Chapter 24 §24.2.

Billing the secondary

Once the primary adjudicates, the secondary claim goes out with the primary's remittance information attached — electronically, this is carried in the 837 as prior payer adjudication data; on paper, the explanation of benefits is attached. The secondary needs to know what the primary allowed, paid, and left as patient responsibility.

A secondary payer does not simply pay whatever the primary left. It applies its own allowed amount and its own benefit, and it may pay nothing at all if its allowed amount is lower than what the primary already paid. Chapter 28 §28.10 works through the arithmetic.

2.9 Workers' compensation, auto/liability, and TRICARE

Three categories that are not health insurance and must not be billed as though they were.

Workers' compensation

An injury or illness arising out of employment is covered by the employer's workers' compensation insurance, not the patient's health plan, and this is not optional or a matter of preference. Health plans exclude work-related injuries, and billing one for a work injury will produce a denial and can look, in volume, like something worse.

Workers' compensation is regulated state by state, and the variation is enormous: different fee schedules (frequently a state-published schedule rather than a negotiated one), different forms, different filing deadlines, different rules about which provider the injured worker may see and who authorizes ongoing treatment, and different dispute processes.

Practical rules: get the claim number and the adjuster's name at registration. Bill the carrier, not the patient. In most states you may not balance bill an injured worker for a covered work injury. And if the claim is denied as non-work-related, the health plan becomes the payer — but only after the workers' compensation denial exists in writing.

Auto and liability

A motor vehicle accident may involve medical payments coverage or personal injury protection under the auto policy, and in no-fault states PIP is typically primary for accident-related care up to its limit.

Beyond that lies liability — a claim against another party, resolved by settlement or judgment, sometimes years later. Providers sometimes place a lien against an anticipated settlement rather than billing the health plan. This is legal in many states, subject to specific requirements, and it is also a decision with real consequences for the patient: it can mean waiting years, and it can mean the provider collects full charges from a settlement that was supposed to compensate the patient.

Subrogation is the health plan's right to recover what it paid out of the patient's eventual settlement. It is why health plans send accident questionnaires and suspend claims until they are returned.

This is a specialized area with genuine legal complexity and substantial state variation. If your practice sees accident cases, get the specifics from counsel; do not improvise.

TRICARE

The health program for uniformed service members, retirees, and their families. It is administered regionally under contract, has its own plan options (Prime, Select, and others), its own authorization and referral rules, its own allowable charge methodology, and its own claims processing contractors.

It is not Medicare and it is not Medicaid, and treating it as either will produce errors. What it does share with Medicare is a statutory framework and an allowable-charge structure that limits what participating providers may collect. Note also that eligibility is tied to enrollment in the Defense Enrollment Eligibility Reporting System, and that eligibility can change with a service member's status — so verify every time.

Program structures, contractors, and rules change. Verify current requirements with the program directly.

2.10 What "allowed amount" is really deciding

Close the loop.

The allowed amount looks like a price. It is not. It is the outcome of a negotiation between two organizations with unequal information and unequal leverage, and understanding what it actually encodes will make you better at every conversation that follows.

It encodes market power. A large health system in a market with two hospitals negotiates differently from a solo practice in a market with forty. The same service, the same code, the same county, can be allowed at figures that differ by a factor of three or more between two providers, under contracts with the same insurer. This is not a scandal; it is what negotiation produces. It is also the reason payer-specific negotiated rates were confidential for so long, and the reason Chapter 1's Case Study 1 was contentious.

It encodes a reference point, usually Medicare. Most commercial contracts are written as a percentage of the Medicare Physician Fee Schedule, which means Medicare's relative value methodology determines the shape of commercial payment even where it does not determine the level. Chapter 23 builds that methodology, and Chapter 3 §3.1 makes the broader argument: Medicare's rules are your rules even when Medicare is not the payer.

It encodes history. Contracts renew. Rates carry forward. A practice that accepted a poor schedule in a bad year can be living with it a decade later because nobody re-opened it.

And it does not encode cost. The allowed amount is not derived from what the service cost the provider to furnish. Nothing in the system computes that. Chapter 23 §23.7 is blunt about it: a charge is not a cost, an allowed amount is not a cost, and any sentence beginning "healthcare costs" should be read carefully to determine which of at least four different quantities the speaker means.

🔍 Check Your Understanding

1. A patient's card says "Northfield Mutual" and your practice is in network with Northfield Mutual. Is that enough to know the claim will be paid at your contracted rate? Why not?
2. Two hospitals in the same city are allowed \$4,100 and \$11,800 for the same procedure by the same insurer. Name three things that could explain the difference, none of which is fraud.
3. Your practice signed a contract at "112% of Medicare." Medicare's conversion factor falls 2% the following year. What happens to your revenue, and did anyone have to notify you?

(Answers: 1. No — the network is product-specific, and you may be in network for the PPO and not for the marketplace or Medicare Advantage product. §2.4. 2. Negotiating leverage and market concentration; contract vintage and whether it has been re-opened; and different contract structures — one may be case rate and one percentage of charges. 3. Revenue on that contract falls by roughly 2% on affected codes, automatically, and in most contracts nobody has to notify you because the schedule is incorporated by reference. This is why §2.6's list of "what else is in the contract" matters.)

🗂️ The Encounter

🗂️ The Encounter

What this chapter contributes: the money, predicted in advance.

Account 10-4471 now has all four numbers, and none of them required the claim to be adjudicated.

```text ACCOUNT 10-4471 — the predicted adjudication, computed on day 1 [constructed teaching example]

FROM THE ELIGIBILITY RESPONSE (Figure 2.1, obtained 8:12 a.m. on day 0): deductible ..................... MET, $0 remaining primary care office visit ...... $30.00 copay all other services ............. 20% coinsurance out-of-pocket maximum .......... $2,165.00 remaining — not a factor

FROM THE CONTRACT (Northfield Mutual fee schedule):

LINE CODE CHARGE ALLOWED ADJUSTMENT PATIENT PLAN

---

1 99214-25 185.00 128.40 56.60 30.00 98.40 2 20610-RT 150.00 78.60 71.40 15.72 62.88 3 J1030 18.00 6.28 11.72 1.26 5.02 4 36415 14.00 3.00 11.00 0.60 2.40

---

   TOTAL         367.00    216.28     150.72     47.58    168.70

CHECK 1: 367.00 - 216.28 = 150.72 ✓ CHECK 2: 216.28 - 47.58 = 168.70 ✓ ```

What this piece settles. What the services are worth (\$216.28), what will be written off (\$150.72), what the patient owes (\$47.58), and what the plan should pay (\$168.70). The practice could have told the patient \$47.58 at check-out on day 0.

What it does not settle. Three things, and they are the next thirty-eight chapters:

1. Whether the codes are right. Every number above assumes 99214, 20610, J1030, and 36415 are the correct codes with the correct modifiers. Nothing in this chapter examined the note. Parts II and III do that.
2. Whether the plan will actually pay \$168.70. It will not — not on the first remittance. A benefit prediction is not an edit prediction, and the payer has edits this chapter never touched.
3. Where \$128.40 came from. The contract says so. But the contract says so because of a methodology, and that methodology is Chapter 23.

Open questions, updated:

• Q6 — Why did the practice charge \$185.00? Raised in Chapter 1. Still open. This chapter showed that under two of the three contract structures in §2.6 the charge is irrelevant, which makes the question sharper rather than answering it. Resolved in Chapter 23.
• Q5 — What is wrong with the knee? Still open. Resolved in Chapter 22.

Conclusion

The allowed amount does not fall from the sky. It comes from a contract, and the split between the plan and the patient comes from a benefit design, and both documents exist and can be read before a claim is ever submitted.

What was decided in this chapter. The five cost-sharing terms and the fixed order in which they apply to a claim line. What network participation obligates and protects. The three questions that separate the plan types, and the warning that plan type predicts access rules and not cost. That a self-funded plan wears the administrator's logo and follows the employer's rules under federal law. The five contract structures and what each puts at risk — including the fact that under two of the three most common professional arrangements, raising your charge changes nothing at all. How to read an eligibility response in six steps. The order of payers and the birthday rule. And that workers' compensation, auto and liability, and TRICARE are their own worlds and must not be billed as health insurance.

And the practical center: Account 10-4471's entire financial outcome was predictable on day 1, to the penny, from two documents the practice already had.

What remains open. Everything about whether the codes are correct — Parts II and III. Everything about the payer's edits, which are not the same thing as the benefit — Chapter 21. And where the contract's numbers came from in the first place — Chapter 23.

The bridge to Chapter 3. This chapter treated all payers as though they were the same kind of thing, negotiating freely. One is not. Medicare does not negotiate; it publishes. It sets the relative value methodology that most commercial contracts reference, writes the correct coding edits that most commercial payers adopt, defines the coverage determination structure that commercial medical policy imitates, and operates the audit apparatus that everyone else models. Learning Medicare's logic is the fastest available route to understanding three-quarters of commercial payer behavior — which is why Chapter 3 comes before a single code.

Key Terms

Premium — the recurring price of holding coverage, paid to the plan regardless of whether care is used. It never appears on a claim. (Ch.2)

Deductible — an amount the patient must pay for covered services, measured in allowed amounts, before the plan begins paying. (Ch.2)

Copayment — a flat dollar amount owed for a specified type of service, usually collected at the time of service. (Ch.2)

Coinsurance — the patient's share expressed as a percentage of the allowed amount, applying after the deductible is satisfied. (Ch.2)

Out-of-pocket maximum — the ceiling on a patient's cost sharing in a benefit period; beyond it the plan pays 100% of covered services. (Ch.2)

In-network / participating provider — a provider under contract with the payer, who accepts the contracted allowed amount as payment in full and may not balance bill. (Ch.2)

Out-of-network — a provider with no contract with the payer; no contracted allowed amount exists, and cost sharing is higher or coverage absent. (Ch.2)

Fee schedule — a list of codes and the amounts a payer will allow for each, often expressed as a percentage of the Medicare Physician Fee Schedule. (Ch.2)

Usual, customary, and reasonable (UCR) — an older methodology setting an allowed amount by reference to prevailing charges in an area, still encountered in out-of-network and some liability contexts. (Ch.2)

Capitation — payment of a fixed amount per member per month for attributed patients, regardless of services furnished, shifting population risk to the provider. (Ch.2)

HMO — a plan with no out-of-network benefit except emergencies, usually requiring a primary care gatekeeper and referrals. (Ch.2)

PPO — a plan with out-of-network coverage at a higher cost share, generally without gatekeeping or referral requirements. (Ch.2)

EPO — a plan with no out-of-network benefit but generally no gatekeeping or referral requirement; it looks like a PPO and behaves like an HMO on the question that costs money. (Ch.2)

POS — a plan combining gatekeeping and referrals for the in-network tier with an out-of-network benefit at higher cost. (Ch.2)

Self-funded plan — an employer plan in which the employer bears the claims risk and pays from its own funds, governed by ERISA rather than state insurance law. (Ch.2)

Third-party administrator (TPA) — an entity, often an insurance company, that administers a self-funded plan without bearing risk. (Ch.2)

Coordination of benefits (COB) — the ruleset determining which of multiple plans pays first, and how the secondary processes what remains. (Ch.2)

Birthday rule — for a dependent child covered by both parents' plans where the parents are married or living together, the plan of the parent whose birthday falls earlier in the calendar year is primary. (Ch.2)

Workers' compensation — state-regulated coverage for work-related injury and illness, primary over health insurance for covered injuries and governed by state-specific fee schedules and rules. (Ch.2)

TRICARE — the health program for uniformed service members, retirees, and their families, regionally administered with its own plan options, rules, and allowable charge methodology. (Ch.2)

Spaced Review

1. A patient has a \$2,000 deductible with \$1,760 remaining, 20% coinsurance, and a \$6,000 out-of-pocket maximum with \$240 accumulated. A service is allowed at \$2,400.00. Compute patient responsibility and plan payment, and show the check.

2. (Chapter 1) State both revenue cycle equations, then explain in one sentence why the deductible in question 1 is measured in allowed amounts rather than charges.

3. A child is covered by both parents' plans. The parents are married. Parent A was born September 30, 1982; Parent B was born September 30, 1990. Which plan is primary, and what rule applies?

4. Your practice is in network with a large national insurer. A claim denies as out of network. Give the two most likely explanations, in order of probability, and say what you would check first.

5. (Chapter 1) A remittance advice shows a line allowed at \$0.00 with no patient responsibility and no denial code. Chapter 1 gave one explanation. Name it, and then name one thing from Chapter 2 that could produce a superficially similar line for an entirely different reason.