a parenthetical designation marking a code reportable only when the procedure was performed alone, or independently of and unrelated to other services at the same session.
"With" convention
where "with" or "in" links two conditions in a code title, the Alphabetic Index, or a Tabular instructional note, the classification presumes a causal relationship, and the conditions are coded as related even absent explicit provider documentation, unless the documentation states they are unrelated. The presumption exists only where the classification creates it.
270 / 271
the eligibility inquiry and its response.
270/271 transaction
the HIPAA standard electronic eligibility and benefit inquiry (270) and its response (271).
275
the standard transaction for additional information, with incomplete adoption.
276 / 277
the claim status inquiry and its response. A 277 reports status; it does not carry payment detail.
277CA
the claim acknowledgment: whether the payer accepted the claim into adjudication. Not the same as a 277, and the acknowledgment that matters most.
278
the services review transaction; prior authorization request and response.
60-day rule
the Affordable Care Act requirement that an identified Medicare or Medicaid overpayment be reported and returned within sixty days of identification (or the cost report date where applicable); a retained overpayment becomes a False Claims Act obligation. "Identified" arrives earlier than comfort wants — verify the current standard at 42 CFR 401.305.
835
the remittance advice transaction. The only standard transaction that carries payment information back.
837I
the electronic institutional claim transaction, carrying the same data as the UB-04 in loops and segments.
837P
the electronic professional claim transaction, carrying the same data as the CMS-1500 in loops and segments.
837P / 837I / 837D
the professional, institutional, and dental claim transactions.
999
the implementation acknowledgment: whether the file was syntactically valid. Accepted, accepted with errors, or rejected. It says nothing about content.
A
AAPC
the credentialing and membership organization founded in the late 1980s as the American Academy of Professional Coders and now known by its initials; grew out of the physician practice and the professional claim, and credentials coders, billers, auditors, documentation specialists, and practice managers.
Abuse
practices inconsistent with sound fiscal, business, or medical practice that result in unnecessary cost to a program. Does not require intent.
Accept assignment
item 27; the provider's agreement to accept the allowed amount as payment in full. In network it reports a fact; out of network it is a decision.
Accounts receivable (AR)
money that has been billed and not yet collected; the standing balance of everything outstanding.
Accounts receivable aging
the sorting of every open balance into buckets by how long it has been open, conventionally in thirty-day steps from the date of service. What the report shows depends on three build choices: the dating basis, the splits, and whether credits are netted.
Accumulator
the running total of a patient's deductible and out-of-pocket spending in a benefit period, and the figure from which patient responsibility must be predicted.
Activity code
an external cause code identifying what the patient was doing when the event occurred; reported once, at the initial encounter only.
Acuity criteria set
the hospital's written, resource-based, reproducible, and auditable rules for assigning facility ED levels, together with the record of how each individual encounter was scored.
Acute and chronic reporting
where the same condition is documented as both and separate index subentries exist at the same indentation level, both are coded and the acute is sequenced first.
Add-on code
a code marked with a plus symbol describing additional work performed with a primary procedure. Never reported alone, exempt from modifier 51, with its permitted primary procedures specified.
Addendum
new information added after an entry was completed, separately dated and signed, with the original entry left intact.
Additional documentation request (ADR)
the letter requesting the records that support specified claims, with a stated deadline. A non-response is scored as an error and denies the claim.
Adjacent tissue transfer
movement of adjacent tissue to close a defect, coded by the square centimeters of primary plus secondary defect. Includes the excision of the lesion.
Administrative law judge (ALJ)
the adjudicator at the Office of Medicare Hearings and Appeals who conducts the third-level Medicare appeal — a genuine hearing, with testimony, and the first level with an amount-in-controversy requirement.
Admitting diagnosis
FL 69; the condition suspected at admission. It frequently differs from the principal diagnosis, and the disagreement is the story of the admission.
Advance Beneficiary Notice (ABN)
a standardized written notice on the CMS-approved form, given to a Medicare beneficiary before a service is furnished, when the provider expects denial as not reasonable and necessary, to permit an informed choice. Must be in advance, specific as to service and reason, include a cost estimate, and offer a choice the beneficiary makes.
Advance Beneficiary Notice of Noncoverage (ABN)
Form CMS-R-131, transferring financial liability to a beneficiary when a normally covered service is expected to be denied as not reasonable and necessary. Not used for statutorily excluded services and invalid if issued routinely.
Adverse effect
a harmful effect from a drug taken correctly as prescribed. Coded with the manifestation first.
Aftercare
care during the healing or recovery phase after initial treatment is complete. Not used for fracture aftercare.
Aging report
the document that presents AR by bucket. Honest when aged from date of service, split by insurance versus patient and by payer, and run gross with credits reported separately.
AHIMA (American Health Information Management Association)
the professional association for health information management, with continuous roots to a 1928 association of hospital record librarians; grew out of the medical record department and credentials coding, documentation integrity, data analytics, privacy, and the academic-pathway health information roles.
Allowed amount
what the contract between provider and payer says a service is worth. The total the provider will receive from all sources combined, and the basis on which patient responsibility is computed.
Alphabetic Index
the volume of ICD-10-CM organized by condition name, used to locate a code. Step one of the two-step rule, always.
Ambulatory payment classification (APC)
a group of clinically similar, resource-similar outpatient services sharing one relative weight and one payment rate; assigned per service via the HCPCS code, so several APC payments are possible on a single claim.
Amendment (record correction)
a change to an existing entry, permissible only where the original content remains legible and retrievable, the change is dated and signed, and the audit trail is preserved.
Amount in controversy
the minimum dollar amount at issue required to reach the ALJ and judicial review levels; adjusted annually, and smaller claims may be aggregated to meet it.
Amounts generally billed (AGB)
the §501(r) ceiling on what a tax-exempt hospital may charge FAP-eligible patients for emergency or other medically necessary care: a defined calculation tied to amounts actually billed to insured patients, not to the chargemaster.
Anemia in neoplastic disease
an anemia code carrying a "code first" instruction directing that the neoplasm be sequenced first. The same pattern applies to anemia in chronic kidney disease and anemia due to antineoplastic chemotherapy.
Anesthesia base units
published units assigned per anesthesia code, reflecting the complexity of the procedure being anesthetized.
Anesthesia physical status modifier
P1 through P6, appended to an anesthesia code to report the patient's condition; assigned and documented by the anesthesia professional, recognized for additional units by some payers and not others, and never adjusted by a coder. (Ch.35; defined in Ch. 18 §18.11)
Annual reset
the rule that every condition returns to zero at the start of each collection year and must be documented and reported again on a face-to-face encounter, however permanent the condition is; diagnoses collected in one year set the score that pays every month of the next.
Annual update cycle
the recurring schedule of code set and payment changes: ICD-10-CM effective October 1, CPT effective January 1, and HCPCS Level II, NCCI edits, and MUE values quarterly.
Antepartum care
the prenatal visits and routine monitoring included in the global obstetric package, reportable separately by number of visits when the package breaks.
Anti-Kickback Statute
42 U.S.C. § 1320a-7b(b); a criminal prohibition on knowingly and willfully soliciting, receiving, offering, or paying remuneration to induce or reward referrals of items or services payable by a federal health care program.
Appeal
a formal request that a payer reverse an adjudication decision, made through a defined review process, arguing that the decision was wrong. Requires a decision to appeal, an argument, and a process with a clock.
Appeal letter structure
the six-part letter: header, ask, standard, demonstration, evidence map, close — with the payer's own standard stated before the facts are argued against it.
Appeal log
the tracking instrument for open appeals: one row per appeal, carrying the amount at issue (allowed, not charge), the level, the filing deadline, the payer's response deadline, the next follow-up, and the outcome — closed only when the money posts.
Apprentice designation
a suffix appended to a credential held by someone who has passed the exam but has not yet documented the required coding experience. A statement about experience, not about the score: the exam and the passing standard are identical. Removed by documented experience, recognized education substituting for part of it, an organization's practical-experience program, or supervised practice — current requirements are the organization's and are revised.
AR dashboard
the one-page monthly view: few numbers, definitions printed on the page, each metric paired with the number that detects its blind spot, trended against the practice's own history. A dashboard is not a control; a person who reads it is.
AR over 90
the share of AR older than ninety days; the tail detector the days-in-AR average hides. Useful only decomposed: old-and-known (payment plans, pending appeals, documented payer projects) is fine; old-and-unexplained is the finding.
Arithmetic mean length of stay (AMLOS)
the ordinary average stay for an MS-DRG; published alongside the GMLOS and skewed upward by outlier stays.
ASC payment system
Medicare's payment system for ambulatory surgery centers: OPPS relative weights multiplied by a substantially lower ASC conversion factor, an annually revised covered-procedures list, an office-based cap, and device-intensive adjustments.
Assertion register
an inventory of every place an assertion can be made about a claim or an encounter by something other than a person deciding about that claim: what it asserts, where it lands and in whose voice, a named owner, and an evidence test run against a real transmitted claim.
Assignment (Medicare)
an agreement to accept the Medicare-approved amount as payment in full and to be paid directly by Medicare.
Assignment of benefits
the patient's authorization for the plan to pay the provider directly rather than paying the patient. A payment-routing question, distinct from network participation, which is a pricing question.
Assistant surgeon (modifiers 80, 81, 82)
a surgeon assisting throughout a procedure without performing a distinct part. Modifier AS identifies a non-physician assistant and is not interchangeable with 80.
Attending provider
FL 76; the provider with primary responsibility for the patient during the encounter. Required on virtually every claim, and not the billing provider.
Attribution
the method by which patients are assigned to an organization for measurement and payment; prospective (the list is known in advance) or retrospective (determined afterward from where care was actually received), usually by a plurality of primary care services.
Audit
a structured, independent re-reading of a defined sample of completed work against a written standard, producing a scored result and a documented finding on each disagreement. Not a search for fraud and not an accusation.
Audit trail
the electronic record's metadata showing when entries were made, by whom, and what was changed. Discoverable, and part of the record's story.
Audit universe
the complete, countable set of items an audit is about: a query with a date range, a payer, a provider, a code set, and a filter, returning a specific number. Every rate and every extrapolation is computed against it.
Authorized representative
the capacity in which a provider ordinarily exercises a member's ERISA or external review appeal rights, under the plan's or program's designation procedure.
Automation bias
the tendency to accept a system's recommendation more readily than the same conclusion reached independently, and to stop looking once a plausible answer is displayed; the failure mode that turns a review loop into a rubber stamp, and one caused by the engine's accuracy rather than by its errors.
Autonomous coding
assignment of codes and release of a claim without a human reviewing that particular chart; currently viable only where the source document is structured, the code space small, the variability low, and the feedback fast and unambiguous.
Autoposting
applying an 835 automatically without human intervention. Requires ERA enrollment.
Average sales price (ASP)
the manufacturer-reported price on which Medicare's payment for separately payable Part B drugs is generally based, plus a percentage add-on. Republished quarterly.
B
Bad debt
a balance the patient could have paid and, after genuine collection effort, did not. A collection cost of doing business, written off under its own code.
Balance billing
billing the patient for the difference between the charge and the allowed amount. Prohibited on in-network services by essentially every network contract, and restricted in defined out-of-network situations by federal law.
Balance billing protections
the No Surprises Act's prohibitions and their state-law counterparts: for protected services, the patient owes only in-network cost sharing, and the provider may not bill the balance.
Base rate
the hospital-specific dollar value of one average-weight case: a national standardized amount split into a labor-related share (adjusted by the wage index) and a non-labor share.
Batch
the submission mode in which claims accumulate and transmit as a file, typically nightly.
Batch versus real-time eligibility
a whole schedule submitted at once and returned as a file, versus a single patient answered in seconds. Most practices need both.
Beneficiary
a person enrolled in Medicare.
Benefit period
the Part A accounting unit, beginning on inpatient admission and ending after the beneficiary has been out of a hospital or skilled nursing facility for 60 consecutive days. A beneficiary can owe more than one Part A deductible in a calendar year.
Bilateral surgery indicator
the Physician Fee Schedule column stating how the bilateral payment rules apply to a code, including whether the code is already bilateral by descriptor.
Billing and coding article
the companion document to an LCD that carries the operational specifics, including the ICD-10-CM codes that support medical necessity and the CPT/HCPCS codes the policy governs.
Billing provider
the entity submitting the claim and receiving payment, identified in item 33.
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. Month and day only; not the older parent.
Blanket ABN
an ABN given without a specific, individualized reason to expect denial. Improper.
Block
a range of related categories within a chapter, carrying its own heading and its own instructional notes, which govern every category beneath it.
Borderline diagnosis
a diagnosis documented as borderline at the time of discharge, coded as confirmed unless the classification provides a specific borderline entry. Distinct from an uncertain diagnosis.
Break-even allowed amount
the allowed amount at which the expected recovery from appealing a denied line exactly equals the labor of appealing it: minutes × loaded rate ÷ overturn rate. The overturn rate belongs in the denominator because the labor is spent on every appeal written and the recovery arrives on only the share that succeed. Below the break-even, appealing the individual line is on average a donation; the category still has to be worked.
Budget neutrality
the requirement that changes to RVUs not increase total spending beyond a statutory threshold, which makes the RVU pool essentially fixed and redistribution the mechanism.
Bundled critical care services
the specific services included in critical care and not separately reportable, including cardiac output interpretation, chest radiograph interpretation, pulse oximetry, blood gas interpretation, gastric intubation, temporary transcutaneous pacing, ventilator management, and vascular access procedures.
Bundled service
a service whose payment is included in that of another service and which is therefore not separately reportable.
Business associate
an entity performing functions involving PHI on behalf of a covered entity; directly liable under HIPAA and requiring a written business associate agreement.
C
Candidate handbook
an organization's current published document governing a specific exam: eligibility, registration, fees, format, delivery mode, permitted materials, identification, retake and reschedule policy, and accommodations. The authority on every exam parameter.
Capitation
payment of a fixed amount per member per month for attributed patients regardless of services furnished, transferring population risk to the provider.
Capped rental
a rental arrangement running for a defined number of months, after which ownership generally transfers to the beneficiary or the arrangement converts.
Carcinoma in situ
malignant cells confined to the layer of origin and not invasive.
Cardiac catheterization family
the group of catheterization codes selected on two axes (what was catheterized; what was imaged), whose descriptors already include the catheter placement, the injection procedures, and the imaging supervision and interpretation. (Ch.35; the bundling rule itself is Ch. 18 §18.4)
Career ladder
the sequence of roles in which the unit of responsibility grows: your own charts, then somebody else's charts, then a process, then a department, then a business function. In this field it runs in three parallel tracks — coding and health information, billing and accounts receivable, and deep specialization — that cross at the manager level.
Case mix index (CMI)
the average relative weight of a hospital's discharges over a period; revenue per case at a fixed base rate; unable by construction to distinguish patient acuity from documentation and coding capture.
Case rate
a single payment for an entire episode of care regardless of the services furnished within it.
Casting and splinting supplies
the immobilization materials, reported with HCPCS Level II Q codes and separately reportable even where the application itself is included in global fracture care.
Category
the first three characters of an ICD-10-CM code, identifying the general condition. A valid code in its own right only when it has no further subdivision.
Category I
five-digit CPT codes for procedures and services that are widely performed and consistent with contemporary practice.
Category II
four-digit CPT codes ending in F, used for performance measurement. Supplemental, optional, and not used for payment.
Category III
four-digit CPT codes ending in T, for emerging technology, services, and procedures. Temporary, and must be used instead of an unlisted code where one describes the service.
CC (complication or comorbidity)
a secondary diagnosis designated by CMS as meaningfully increasing a stay's resource consumption; supports a DRG family's middle severity tier.
CCA (Certified Coding Associate)
AHIMA's entry-level coding credential, designed as a starting point rather than a destination.
CCS (Certified Coding Specialist)
AHIMA's mastery-level coding credential with a hospital orientation, covering inpatient and outpatient facility records including ICD-10-PCS and DRG assignment. Not designed as a first credential.
AHIMA's mastery-level credential on the professional side: the physician's claim, CPT, and the evaluation and management rules.
Certificate of medical necessity
additional documentation required for certain DMEPOS items.
CFO of a practice
the finance role a revenue cycle director most often moves into, where the work stops being claims and becomes contracts, capital, staffing models, and forecasts. The revenue cycle route into it carries an advantage most finance backgrounds do not: knowing where the money leaks at the line-item level, from having personally worked the queue.
Character
a single position in a code. The first is always a letter; the second is always a number; the third and later may be either.
Charge
what the provider bills for a service, set unilaterally in a fee schedule or chargemaster. An opening figure, not a price; almost nobody pays it.
Charge capture
the process by which a service performed becomes a charge on an account. Its characteristic failure produces no denial and no report, only an absence.
Charge lag
the interval between the date of service and charge entry. A measured metric, and the reason coding queues are worked oldest first.
Charge uniformity
the principle that the same service carries the same charge regardless of payer, with payer differences living in the allowed amount rather than in the charge.
Chargemaster
a facility's master file of chargeable items, holding the revenue-code-to-HCPCS pairing that determines what its claims say.
Chargemaster (charge description master, CDM)
a hospital's complete list of billable items and their charges, commonly tens of thousands of lines, including items as well as services.
Charity care
a balance the patient could not pay, forgiven under a financial assistance policy — and which should never have been pursued as bad debt. The determination must precede collection activity, not follow its failure.
Chart review
the review of medical records to reconcile the diagnoses reported for a member against what the documentation supports.
Chief complaint
the stated reason for the encounter, in brief. The patient's reason for coming, not the provider's conclusion.
CHIP (Children's Health Insurance Program)
coverage for children in families with incomes above Medicaid limits, administered by states as a Medicaid expansion, a separate program, or a combination.
CIC (Certified Inpatient Coder)
AAPC's credential for inpatient facility coding: ICD-10-CM and ICD-10-PCS with MS-DRG assignment.
Civil Monetary Penalties Law
authority for per-item penalties and assessments for defined conduct, including presenting claims a person knows or should know are false.
CKD staging
chronic kidney disease classified by stage from the provider's documentation, with the end stage renal disease code governing where both a stage and end stage renal disease are documented.
Claim
the standardized request for payment submitted to a payer, on a CMS-1500 or UB-04 or their electronic equivalents. The unit of billing; one encounter can generate two claims.
Claim adjustment reason code (CARC)
the code stating why an amount was adjusted. It always accompanies a group code and an amount.
Claim returned to provider (RTP)
an Outpatient Code Editor disposition in which the entire claim is sent back unprocessed for correction; because nothing was adjudicated there is nothing to appeal, and the timely filing clock continues to run.
Classification
a system sorting an unbounded set of cases into a bounded set of mutually exclusive categories, such that every case has exactly one place. Not a list and not a dictionary of diseases.
Clean claim
a claim that contains all required information, passes edits, and can be adjudicated without the payer needing anything further from the provider.
Clean claim rate
the percentage of claims accepted on first submission without rejection or denial.
Clearinghouse
the intermediary that receives claims from providers, validates and reformats them, routes them to the correct payers, and returns acknowledgments and remittance advices.
Clearinghouse edits
validation rules a clearinghouse applies before the payer sees a claim. Somebody's implementation of somebody else's rule; passing them predicts nothing about adjudication.
CLIA
the Clinical Laboratory Improvement Amendments, governing which sites may perform which laboratory tests on human specimens.
Clinical documentation integrity (CDI)
the discipline of making the medical record describe the patient accurately, completely, and in language the classification systems can read; reviewed against the clinical evidence in the record itself and corrected only by the clinician who owns the statement. Distinguished from auditing by timing: CDI reads unfinished work.
Cloned documentation
content identical or nearly identical across encounters or across patients, produced by copy-forward, templates, macros, or automatic population.
Closed treatment
fracture treatment in which the fracture site is not surgically opened. Not a statement about whether the fracture was compound.
CMS-1450
the UB-04's other name. The two are the same form; both names are in active use.
CMS-1500
the standard claim form for professional services. Its electronic equivalent is the 837P.
CO — contractual obligation
an adjustment the provider absorbs under the contract. The patient may not be billed for it.
CO-16
the claim lacks information needed for adjudication. Unactionable without its remark code.
CO-45
charge exceeds the fee schedule or contracted amount. The ordinary contractual adjustment.
CO-97
the benefit for this service is included in the payment for another service already adjudicated. A bundling assertion.
Co-surgeon (modifier 62)
one of two surgeons each performing a distinct part of the same procedure requiring their own skill set. Each reports the same code and each must document an operative report.
COC (Certified Outpatient Coder)
AAPC's credential for hospital outpatient facility coding: ambulatory payment classifications, status indicators, and packaging.
Code
the complete, valid entry at its full character length, three to seven characters. A code reported at fewer than its full length is invalid, not merely less specific.
Code also
an instruction that two codes are needed to fully describe a condition, without dictating their sequence.
Code book
the published reference for a code set: ICD-10-CM, CPT, or HCPCS Level II. The authority for what a code is and which rules govern it.
Code book annotation rules
an organization's published rules governing what a candidate may write, highlight, tab, or affix in a code book carried into an exam. Handwritten notes, highlighting, and tabs are generally permitted; affixed, inserted, or printed supplementary material generally is not; an edition rule usually applies. The rules differ by organization, by exam, and by delivery method, and they change — verify the current rules with the organization administering your exam.
Code first
an instruction appearing on a manifestation code, requiring that an underlying condition be coded and sequenced first.
Coder-in-the-loop
a workflow in which software proposes and a credentialed human reviews, accepts, rejects, or corrects each suggestion before submission.
Coding Clinic
the American Hospital Association publication that is the recognized source of official coding advice for ICD-10-CM and ICD-10-PCS.
Coding manager
the first role measured on other people's accuracy rather than your own. Owns the productivity and quality standards, the audit sample, the corrective action plans, and the queue's priorities. The largest and least-prepared-for transition on the ladder.
Coinsurance
the patient's share expressed as a percentage of the allowed amount, applying after the deductible is satisfied.
Collection agency placement
engaging an agency, usually on contingency, to pursue bad debt. Delegation, not disposal: the practice screens every account against the FAP first, sets the agency's rules, and reconciles monthly.
Column One
in a PTP edit, the code that is payable; generally the more comprehensive or higher-valued service.
Column Two
in a PTP edit, the code that is not separately payable when reported with Column One.
Combination code
a single code classifying two diagnoses, or a diagnosis with an associated manifestation or complication. Use where it exists and fully describes the condition; it asserts a relationship that must be documented.
Companion guide
a payer's published document stating how it requires the standard transaction to be populated. Governs that payer's claims where it differs from general instruction.
Complete versus limited study
an ultrasound classification turning on whether a defined set of elements was imaged and documented. A study missing one documented element is limited.
Complex repair
repair requiring more than layered closure, such as scar revision, extensive undermining, stents, or retention sutures.
Compliance program
the seven-element structure described in OIG guidance: written policies, a compliance officer and committee, training, lines of communication, monitoring and auditing, enforcement, and prompt corrective action.
Compliant query
a written request to a clinician to clarify documentation that is conflicting, ambiguous, incomplete, illegible, or clinically inconsistent: presenting the record's own clinical evidence, asking an open question, offering clinically reasonable options including "clinically undetermined," naming no code and no payment consequence, instructing that the response be documented in the medical record, and retained with that response.
Composite APC
a single payment for a defined combination of specified services furnished together on the same day or in the same session — the multiple-imaging composites are the classic case — rather than for each member separately; members carry status indicator Q3.
Comprehensive APC (C-APC)
status indicator J1 (J2 for a qualifying observation encounter): one payment for a designated primary service and virtually everything else on the same claim, with narrow excepted categories and defined complexity adjustments.
Comprehensive Error Rate Testing (CERT)
the program that measures Medicare fee-for-service's improper payment rate from a random national claim sample. Selection says nothing about the provider; a non-response still costs the sampled claim.
Comprehensive/component
the edit rationale under which one code's service includes the other's. Invites the question "was this separate?"
Computer-assisted coding (CAC)
software that reads clinical documentation and proposes codes for a human to review, presenting each suggestion with the source text that produced it.
Concurrent care
the provision of similar services to the same patient by more than one professional on the same day. Permissible where each service is reasonable and necessary and the record shows what each professional was managing.
Concurrent review
review of a record while the encounter is still open, before the bill drops and while the clinician who wrote the note can still be asked; the timing is what makes a clarification a progress note rather than an addendum.
Condition code
a circumstance code reporting a fact about the encounter.
Condition Code 44
the mechanism for changing an inpatient admission to outpatient status before the patient is discharged, following utilization review with physician concurrence. Unavailable after discharge.
Consultation
a service rendered at the request of another physician or appropriate source, requiring a documented request, an opinion rendered, and a written report returned to the requesting professional.
Continuing education unit (CEU)
the unit in which ongoing education is counted toward maintaining a credential within a defined reporting cycle; documentation is retained because holders can be audited.
Contract coding
coding performed on a defined engagement rather than as an employee, through an agency, as an independent contractor, or on a fixed term. Establish before accepting: the rate basis, who supplies the code books, encoder, and continuing education, who audits and against which named accuracy measure, and who will verify the engagement later.
Contractual adjustment
the difference between the charge and the allowed amount, written off by the provider under the terms of the payer contract. Never billable to the patient on in-network services.
Conversion factor
the single national dollar amount converting adjusted RVUs into a payment. One number for the entire physician fee schedule.
Converted to open
a laparoscopic or endoscopic procedure completed as an open procedure. Only the open procedure is reported; modifier 22 applies where the conversion made the work substantially greater.
Cooperating Parties
NCHS, CMS, the American Hospital Association, and AHIMA, who jointly approve the ICD-10-CM Official Guidelines.
Coordination of benefits
the determination of which payer is primary when more than one covers the patient.
Coordination of benefits (COB)
the ruleset determining which of multiple plans pays first, and how the secondary payer processes what remains.
Copayment
a flat dollar amount owed for a specified type of service, usually collected at the time of service.
Corporate integrity agreement
a negotiated settlement obligation, typically five years, imposing specified compliance measures including independent review, training, and reporting.
Corrected claim
a resubmission that replaces a prior claim: item 22 code 7 on the professional form, frequency digit 7 on the institutional. Omitting it creates a duplicate.
Corrective action plan (CAP)
a written commitment naming a finding, its root cause, the specific change, a person, a date, a test, and the re-audit that runs the test. Missing the last two fields, it is an intention.
Cost to collect
everything the collection function costs divided by what it collects; commonly measured in the low single digits as a percent of collections for physician practices (verify current benchmarks). Gameable by not doing the work, so never read alone.
Coverage with evidence development
an NCD mechanism under which an item or service is covered only where the beneficiary participates in an approved clinical study or registry.
Covered entity
a health plan, health care clearinghouse, or health care provider that transmits health information electronically in connection with a covered transaction.
Covered indication
a diagnosis or clinical circumstance under which a policy covers a service.
CPB (Certified Professional Biller)
AAPC's credential for the claim after the codes: claim forms, submission, remittance, denials, appeals, accounts receivable, and patient billing.
CPC (Certified Professional Coder)
AAPC's core credential, for physician and outpatient.
CPMA (Certified Professional Medical Auditor)
AAPC's credential for scoring another professional's coding against a cited standard and defending the finding; a different skill from coding.
CPT (Current Procedural Terminology)
the code set describing procedures and services furnished by physicians and other qualified health care professionals. HCPCS Level I, maintained by the American Medical Association, updated every January 1, and copyrighted.
CPT Editorial Panel
the AMA-appointed body that considers proposals to add, revise, and delete CPT codes, advised by the CPT Advisory Committee. It decides what codes exist.
CPT modifier
a two-digit modifier maintained by the American Medical Association.
CRC (Certified Risk Adjustment Coder)
AAPC's credential for risk adjustment: condition categories, the risk adjustment factor, and the documentation risk adjustment requires.
Credit balance
an account balance below zero: more posted in payments and adjustments than was ever charged. A symptom with three diagnoses — posting error, patient refund, payer refund — triaged from documents before any money moves.
Critical care time
time aggregated on a calendar date and devoted to a critically ill or injured patient, including time on the unit and family discussion necessary to determine treatment when the patient cannot participate. Excludes separately reportable procedures. Under 30 minutes is not critical care.
Crossover
the automatic transmission of a claim from a primary payer to a secondary. Common and not universal; assuming it produces never-billed secondary claims.
Crossover claim
a Medicare-adjudicated claim automatically forwarded by Medicare to a registered secondary payer, with the adjudication attached.
Crosswalk
a mapping between code sets or between versions of a code set. A research aid that narrows where to look; never a substitute for a lookup, because it cannot supply specificity the source code never carried.
D
Dash
a trailing hyphen on an index entry, indicating that more characters are required and that only the Tabular List can supply them.
Data element
one field inside a segment, referred to by position. SV107 is the diagnosis pointer field.
Data reviewed and analyzed
the MDM element scored across three categories: Category 1 (unique tests ordered or reviewed, unique external notes, independent historian); Category 2 (independent interpretation of a test performed by another, not separately reported); Category 3 (discussion of management or test interpretation with an external professional, not separately reported).
Days in AR
total accounts receivable divided by average daily charges: the standing pile converted into time. Every term is a definitional choice (credits gross or net; denominator window), and the metric cannot distinguish collecting faster from writing off more.
Debridement depth
the deepest tissue actually removed, which determines the code family. Tissue exposed is not tissue debrided.
Deductible
an amount the patient must pay for covered services, measured in allowed amounts, before the plan begins paying.
Definitive drug testing
testing identifying specific drugs and quantities; a separate code family from presumptive testing.
Dementia coding
categories requiring severity and behavioral or psychological disturbance specifiers, several of which carry "code first" instructions for the underlying physiological condition.
Demographic coefficient
the portion of a risk score derived from enrollment facts rather than from a chart: age band, sex, Medicaid or dual-eligible status, institutional versus community residence, and originally-disabled status. Nothing in a medical record changes it.
Denial
a payer's decision, after adjudication, not to pay all or part of a claim. Distinct from a rejection, in which the claim was never adjudicated at all.
Denial log
one row per denied line, carrying the codes, the amounts, the root cause, whether it was preventable, the action, and the outcome.
Denial rate
denied lines divided by lines adjudicated. Not one number: it varies by lines-or-claims, zero-pay-or-any-adjustment, and adjudicated-or-submitted.
Denial taxonomy
the seven families: eligibility, authorization, coding, documentation, timely filing, coverage and necessity, duplicate. Four of the seven are outside the coder's control.
Denial work queue
the ordered list of denials awaiting work. Sorted by deadline, then category, then dollar.
Denials resolved
the count of denials that produced money or a correct closure, as distinct from denials worked. The two are identical until a category is unwinnable.
Designated health services
the categories of service to which the physician self-referral prohibition applies.
Designated record set
the HIPAA-defined set of records used to make decisions about individuals, which patients may access and request amendment of. Generally broader than the legal health record.
Diabetes "with" linkage
the classification's presumption of a causal relationship between diabetes and the conditions the Alphabetic Index links to it under "with," permitting combination coding without an explicit provider statement, subject to Chapter 9 §9.7's three boundaries.
Diagnosis linkage
the relationship, carried on a professional claim by diagnosis pointers, between a service line and the diagnoses that justify it.
Diagnosis pointer
the letter or letters in item 24E linking a service line to the diagnoses in item 21 that justify it. A pointer is a claim about why a service was performed.
Discharge day management
99238 (30 minutes or less) and 99239 (more than 30 minutes); the aggregated discharge work for the date of the actual discharge, reported once per stay by the attending. 99239 requires the time to be documented.
Discharge summary
the narrative of an entire admission. The most useful single inpatient document and never sufficient by itself for coding.
Discounted cash price
the hospital's published price for self-pay patients, one of the required standard charge types in the machine-readable file; frequently far below the gross charge.
Discussion period
the defined window in which a provider may take a postpayment finding up with the contractor before it is sent for adjustment and becomes a recovery.
Disease coefficient
the weight a risk model attaches to a condition category that a member's documented and reported diagnoses reached during the collection year.
Distinct procedural service (modifier 59)
a procedure distinct or independent from other non-E/M services on the same day, used to override a bundling edit. A last resort where no more descriptive modifier applies.
DMEPOS
durable medical equipment, prosthetics, orthotics, and supplies; a category with its own suppliers, enrollment, standards, and documentation regime.
Documentation template
a structured prompt in the medical record. A template that asks a question is prevention; a template that supplies an answer is an assertion nobody made.
Documented negative
a sentence whose only purpose is to record that something did not happen, converting silence into evidence and deciding between paired codes distinguished by a single feature. (Named as a device in Ch. 13 §13.6 and consequenced in Ch. 17 §17.7; Ch. 38 §38.1 owns the general argument and the installation.)
Dominant / non-dominant
a specificity axis on several neurological deficit codes, distinguishing whether the affected side is the patient's dominant side, with default rules where handedness is not documented.
Dosage-based reporting
selecting units by dividing the dose administered by the dosage stated in the code's descriptor.
Downcoding
reporting a code reflecting a less expensive service than the documentation supports. An inaccuracy, not a conservative choice, and not a legal defense.
Dual eligible
a person enrolled in both Medicare and Medicaid.
E
ED facility acuity leveling
assignment of an emergency department facility visit level from the hospital's own written criteria measuring resource intensity, in the absence of any national criteria; distinct in both scale and subject from the physician's medical-decision-making level. (Ch.35; the professional/facility split is Ch. 16 §16.9)
EDI
electronic data interchange; the structured exchange of business documents between computer systems. In health care, the HIPAA standard transactions.
EDI enrollment
the enrollment permitting a practice to submit claims electronically to a payer.
Edit override
the use of a modifier to permit separate payment of a Column Two code. Permissible only where the modifier indicator allows it and where documentation already in the record establishes the separating circumstance.
EFT enrollment
the separate enrollment permitting payment by direct deposit. A banking arrangement, independent of the other two.
Electronic health record (EHR)
the system owning the clinical record: notes, orders, results, medications, problem list, images, and the audit trail.
Electronic remittance advice (ERA)
the electronic remittance, carried by the 835 transaction and postable by machine.
Eligibility verification
confirming with the payer that coverage is active for the date of service. Distinct from asking the patient.
Embedded versus aggregate deductible
in an embedded family design an individual member's expenses stop at the individual deductible; in an aggregate design no member receives plan payment until the entire family deductible is satisfied.
Emergency department levels
99281–99285, leveled on medical decision making only, with no new/established distinction and no time-based selection option.
Encoder
software that helps locate and validate codes, either as a digital index-and-tabular or through a logic pathway. It has not read the note and does not decide whether documentation supports a code.
Encounter
a single instance of clinical care: one visit, one admission, one procedure. The unit of clinical work, and not the same thing as a claim or an account.
Endoscopic base code
the diagnostic endoscopy of a family, whose value is subtracted from additional endoscopic procedures of the same family performed at the same session, in place of the ordinary multiple-procedure percentage reduction.
Entity identifier
the part of a 277CA message stating whose information is at fault: the subscriber, the patient, the rendering provider, the billing provider. Frequently the whole answer.
EPO (exclusive provider organization)
a plan with no out-of-network benefit but generally no gatekeeper or referral requirement.
ERA enrollment
the separate enrollment permitting a practice to receive the 835 electronically. Without it, autoposting is impossible.
Error log
the exam-preparation form of Chapter 6 §6.10's personal question file: for every missed item, the question, the answer, the source that settles it, and why you got it wrong. The last column is the one that changes behavior, because there are roughly six reasons and each has a different fix.
Escalation
in the Medicare ladder, moving an appeal to the next level when the current level misses its statutory decision timeframe; generally, invoking a deadline the reviewing body owes you.
esMD
electronic submission of medical documentation; Medicare's gateway for responding to records requests. Not a general claims-attachment solution.
Essential modifier
an indented subterm in the Alphabetic Index. It changes the code and must be supported by the documentation.
Established patient
any patient who does not meet the definition of a new patient.
Etiology
the underlying condition in a two-code pair, sequenced first.
Evaluation and management (E/M)
the CPT category describing the cognitive work of evaluating and managing a patient, as distinct from performing a procedure. Measured by medical decision making or by total time on the date of the encounter.
Exam content outline
the published list of the domains an examination covers and their approximate weights, sometimes called an exam blueprint; the document a study plan should be built against.
Exception queue
where autoposting routes what its rules cannot classify. It contains the interesting items by construction, and it is frequently unowned.
Excludes1
"not coded here." The two conditions cannot occur together and must not both be reported, subject to a narrow exception where the conditions are genuinely unrelated in a particular patient.
Excludes2
"not included here." The excluded condition is not part of the code, but a patient may have both, and both may be reported when both are documented.
Exclusion
OIG action barring an individual or entity from participation in all federal health care programs; no program may pay for items or services furnished, ordered, or prescribed by an excluded person, and the prohibition reaches employment in any capacity by a billing provider.
Expanded fracture seventh characters
A (initial, closed), B (initial, open), D (subsequent, routine healing), G (subsequent, delayed healing), K (subsequent, nonunion), P (subsequent, malunion), S (sequela).
Expected allowed amount
what a line should have been allowed, computed from the contract independently of the remittance. The instrument that makes underpayment detection possible.
Explanation of benefits (EOB)
the payer's statement to the member about how their benefits were applied. Not a bill, and it says different things from the provider's remittance on purpose.
External cause code
a chapter 20 code describing how an injury or condition occurred. Never first-listed.
External Cause Index
a separate index organized by event or circumstance, leading to chapter 20 codes describing how an injury occurred.
External cause status
a code identifying whether the event was work-related, military, civilian, or volunteer activity. Frequently mandatory for workers' compensation claims.
External review
review of a plan's final adverse determination by a reviewer outside the payer, required by the ACA for medical-judgment denials and rescissions; the decision binds the plan. State process for insured plans, federal process for self-funded plans.
Extraordinary collection action (ECA)
under §501(r), a collection action requiring prior reasonable efforts to determine FAP eligibility: reporting to credit agencies, selling the debt, lawsuits, liens, garnishments, and similar measures.
Extrapolation
projecting an overpayment measured on a probability sample across the whole universe to produce a demand. Under Medicare it requires a sustained or high level of payment error, or failed educational intervention, and is demanded at the lower limit of a stated confidence interval.
Eye codes (general ophthalmological services)
intermediate and comprehensive examination codes that are an alternative to the E/M office visit codes, with a comprehensive examination defined by a list of required elements.
F
Facility acuity leveling
a hospital's own written criteria for assigning a facility emergency department level based on the resources it consumed. There is no national system; the criteria must be written, consistently applied, resource-based, reproducible, and auditable.
Facility claim
the claim reporting the institution's resources, submitted on the UB-04 as an 837I.
Facility component
the institutional portion of a service: rooms, staff, supplies, and equipment furnished by the organization. Billed on a UB-04.
False Claims Act
31 U.S.C. §§ 3729–3733; the primary civil enforcement statute in American healthcare, prohibiting knowingly presenting false claims, using false records material to them, and improperly avoiding an obligation to repay the government.
False negative (coding QA)
a code the record supported that was never reported; it costs revenue and distorts severity, risk, and quality data, and it announces itself in no system.
False positive (coding QA)
a code proposed or reported that the documentation does not support; on a submitted claim it is a statement to the payer and, to a federal health program, a certification.
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.
Financial assistance policy (FAP)
a written policy defining who qualifies for free or discounted care, on what criteria, and how to apply; required of tax-exempt hospitals by IRC §501(r), which also requires wide publicity, limited charges to eligible patients, and restraint before extraordinary collection actions.
Financial clearance
the determination that all front-end requirements for a billable encounter have been satisfied: identity, coverage, coordination of benefits, referral, authorization with scope, medical necessity screening, estimate, patient notification, and collection or arrangement.
First-listed diagnosis
outpatient: the condition, problem, or other reason chiefly responsible for the services provided at this encounter. Determined by the encounter, not by severity or chronicity.
First-pass resolution rate
claims paid on first submission with no intervention.
Follow-up
surveillance after treatment has concluded and the condition no longer exists. Distinct from aftercare.
Form locator
a numbered field on the UB-04. The institutional claim's coordinate system, as item numbers are the professional claim's.
Fracture care
global management of a fracture, carrying a 090-day global period that includes the initial treatment, the first cast or splint, and normal follow-up including subsequent casting.
Fraud
knowingly and willfully executing, or attempting to execute, a scheme to obtain money from a health care benefit program by false pretenses. Requires intent.
Frequency digit
the last digit of the type of bill, stating whether the claim is original, interim, a replacement, or a void. A corrected claim submitted with frequency 1 creates a duplicate.
Frequency limitation
a coverage criterion restricting how often a service is payable, expressed per calendar year, per rolling period, per number of years, per lifetime, or per episode.
Front-end denial rate
denials attributable to eligibility, registration, authorization, or coordination of benefits. Requires root-cause classification to compute.
Front-end rejection
a claim stopped at the clearinghouse or the payer's front end, before adjudication.
Fully loaded cost
the true cost of an hour of staff time: wage plus taxes, benefits, and the overhead that makes the work possible. This book's constructed teaching figure for denial-management staff: \$36.00 per hour, \$0.60 per minute.
G
G-code
a HCPCS Level II code established because CPT has no code for a service, because Medicare requires a different rule than CPT's, or because Medicare requires a distinction CPT would not make.
G89
the ICD-10-CM category of pain codes classified by type and cause rather than by anatomical site: acute, chronic, neoplasm-related, and postoperative pain.
General Equivalence Mapping (GEM)
the CMS-published bidirectional approximation between ICD-9-CM and ICD-10-CM. An approximation, not a translation.
Geographic practice cost index (GPCI)
a locality multiplier applied to each RVU component, reflecting relative cost. A value of 1.000 is the national average. GPCIs adjust cost, not value.
Geometric mean length of stay (GMLOS)
the multiplicative average length of stay published for each MS-DRG; resistant to long-stay outliers, and the statistic the payment rules key on.
Global orthopedic fracture care
reporting fracture treatment with a code carrying a 090-day global period that includes the initial treatment, the first cast or splint, and normal follow-up through healing; correct only where the reporting physician is providing definitive care, as documented in the plan. (Ch.35; the fork itself is Ch. 17 §17.7)
Global period
the duration of the surgical package, expressed as an indicator: 000 (minor, no postoperative days), 010 (minor, 10 days), 090 (major, one preoperative day plus 90), XXX (concept does not apply), YYY (payer determined), ZZZ (included in another code's global).
Global period modifiers
24 (unrelated E/M during a postoperative period), 57 (decision for major surgery), 58 (planned or staged related procedure), 78 (unplanned return to the operating room for a related procedure), and 79 (unrelated procedure). 58 is planned; 78 is not.
Global service
both the professional and technical components, reported without a modifier by an entity that provided both.
Good faith estimate
the estimate of expected charges to which uninsured and self-pay patients are entitled before scheduled care.
Good faith estimate (GFE)
the No Surprises Act's required pre-service estimate for uninsured and self-pay patients: a written estimate of expected charges for scheduled items and services, with applicable codes, expected charges, and provider identifying information, furnished around scheduling or on request. Backed by the patient-provider dispute resolution process.
Gross collection rate
payments divided by charges. Its denominator is arbitrary, so it does not measure collection performance.
Group code
the two-letter code on every adjustment stating who bears the amount: CO, PR, OA, or PI. It decides who owes; the CARC decides why.
Grouper
software that assigns a payment classification, such as an MS-DRG or an APC, from a set of codes. Deterministic, and useful for testing what a documentation gap is worth.
Grouper logic
the assignment sequence — pre-MDC check, MDC from the principal diagnosis, the surgical partition, the severity split — by which software assigns the MS-DRG from the coded record.
Guideline
the instructional text at the front of a section or subsection, governing every code beneath it: definitions, what codes include, reporting rules, modifier guidance, and unlisted code requirements.
H
Hard denial
a denial where the money can no longer be obtained. The amount becomes a write-off.
HCPCS Level I
another name for CPT, maintained by the American Medical Association and updated every January 1.
HCPCS Level II
the CMS-maintained code set for supplies, equipment, drugs, transport, and services CPT does not describe; updated quarterly.
HCPCS Level II modifier
a two-character modifier containing at least one letter, maintained by CMS. Used on CPT codes as well as HCPCS Level II codes.
Heart failure axes
the four dimensions along which heart failure is classified: type (systolic, diastolic, combined), acuity (acute, chronic, acute on chronic), cause or association, and other specified forms.
Hierarchical condition category (HCC)
a group of clinically related diagnoses that predict similar incremental cost, treated by a risk model as a single unit carrying a single coefficient, and ranked within its disease family so that a member is counted once at the most severe level.
Hierarchy
the ranking of condition categories within one disease family, from most to least severe.
HIPAA
the Health Insurance Portability and Accountability Act of 1996; source of the Privacy Rule, the Security Rule, and the Transactions and Code Sets Rule that mandates ICD-10-CM, CPT, and HCPCS as national standards.
History and physical (H&P)
the document establishing the reason for admission or surgery, the patient's baseline, and existing comorbidities.
History code
a Z-code describing a resolved personal condition, or a family condition affecting this patient's risk.
History of present illness (HPI)
the narrative of the presenting problem: onset, location, duration, character, aggravating and relieving factors, severity. Frequently the only place conservative therapy is documented.
HIV coding rules
B20 for HIV disease where an HIV-related condition is or has been documented; Z21 for asymptomatic HIV infection status in a patient who has never had an HIV-related condition. Once B20 is assigned, B20 applies to all subsequent encounters.
HMO (health maintenance organization)
a plan with no out-of-network benefit except emergencies, usually requiring a primary care gatekeeper and referrals.
Hospital-acquired condition (HAC)
a condition on the payment-provision list (Deficit Reduction Act of 2005) that, when reported with POA = N or U, cannot serve as a CC or MCC; distinct from the later HAC Reduction Program.
Hypertension table conventions
the asymmetry by which the classification presumes a cause-and-effect relationship between hypertension and chronic kidney disease, while requiring a stated or implied relationship between hypertension and a heart condition before a combination code may be assigned.
I
ICD indicator
the field in item 21 stating which diagnosis code set is in use.
ICD-10-CM
the International Classification of Diseases, Tenth Revision, Clinical Modification; the diagnosis code set used in all United States healthcare settings, maintained by NCHS and revised effective October 1 each year.
ICD-10-PCS
the seven-character, table-built procedure code set used only for hospital inpatient procedure reporting; maintained by CMS and updated every October 1.
Imaging guidance
imaging used to direct a procedure; included when named in the descriptor, replaced by a combined code where one exists, otherwise separately reportable. Every guidance code requires permanent image recording and a report.
Immunization administration
the code paying for administering a vaccine, reported in addition to the vaccine product code.
Impending or threatened condition
coded as a confirmed diagnosis if the condition occurred; if not, the index is checked for "impending" or "threatened" subentries, and otherwise the underlying condition or symptoms are coded.
Implementation guide
the technical specification defining one transaction: its segments, elements, and requirements. Settles every argument about what the standard requires.
Improper payment
the statutory category the federal error-rate programs measure: any payment that should not have been made or was made in an incorrect amount, including underpayments, and including payments for which insufficient documentation prevents a determination. It is not a fraud measure.
In-network provider (participating provider)
a provider under contract with the payer, who accepts the contracted allowed amount as payment in full and may not balance bill.
Incident-to
a Medicare provision permitting qualifying office services furnished by auxiliary personnel to be billed under the physician's national provider identifier at 100% of the fee schedule rather than 85%. Requires an established patient, an established plan of care, no new problems addressed, and direct supervision.
Incident-to supply
a supply usual to a procedure or visit and included in its payment rather than separately reportable.
Inclusion term
a condition listed beneath a code as an example of what the code covers. Not exhaustive.
Independent historian
an individual who provides history in addition to the patient because the patient is unable to provide a complete or reliable history.
Independent interpretation
the reporting professional's own documented interpretation of a test performed by another, counted under Category 2 only when it is not separately reported.
Independent review organization (IRO)
the accredited outside reviewer that conducts an external review.
Informational modifier
a modifier conveying information without directly changing payment. The boundary is payer-specific.
Initial denial rate
the rate of denial on first submission. The honest version of the measure.
Initial encounter (7th character A)
an encounter at which the patient is receiving active treatment for the condition. It does not mean the first visit.
Initial encounter (A)
an encounter at which the patient is receiving active treatment for the condition. A patient may have many encounters coded A. It does not mean the first visit.
Initial hospital inpatient or observation care
the first face-to-face service of a stay by a professional, or by another professional of the same specialty in the same group. Not synonymous with the admission date.
Initial service
the primary administration service for an encounter, selected by hierarchy, generally one per encounter per vascular access site.
Injection and infusion hierarchy
the ordering that selects the initial administration service: chemotherapy above therapeutic, prophylactic, and diagnostic administration, above hydration; and infusions above pushes above injections. It overrides chronology.
Inpatient Prospective Payment System (IPPS)
Medicare's payment system for acute care hospital inpatient stays: one predetermined payment per discharge, set by classification rather than by cost or charges, effective since October 1, 1983.
Inpatient status
a formal admission determination, generally paid under Medicare Part A.
Inpatient-only list
the annually revised list of procedures (status indicator C) that Medicare pays for only when furnished in the inpatient setting; furnished on an outpatient claim, the surgical episode is unpayable.
Insurance AR / patient AR
the first cut of any AR analysis. Insurance AR resolves on adjudication schedules and dies by deadlines; patient AR resolves on statement cycles and household budgets. The two need different workflows and different clocks.
Integral sign or symptom
a sign or symptom routinely associated with a disease process, not separately coded when the definitive diagnosis is established.
Integrated triage
the ninety-second test combining Chapter 20's four reasons a valid code does not pay, Chapter 21's six-way edit branch, and Chapter 22's coded-wrong versus never-covered test. Most branches say do not appeal.
Interaction
a modeled combination of two conditions, or a condition and a status, that predicts more cost together than separately. It is computed by the model when both underlying conditions are documented and reported, and it can never itself be coded.
Intermediate repair
layered closure involving deeper subcutaneous tissue or superficial fascia in addition to skin; or single-layer closure of a heavily contaminated wound that required extensive cleaning or removal of particulate matter. Separately reportable with an excision.
Intraservice sedation time
time beginning with administration of the sedating agent, requiring continuous face-to-face attendance, and ending when the procedure is complete and the patient is stable for post-service supervision.
Item number
a numbered field on the CMS-1500, and the industry's coordinate system for describing claim problems.
J
J-code
a HCPCS Level II code for a drug other than one taken by mouth, whose descriptor specifies a dosage.
Joint size
the anatomic classification (small, intermediate, or large) that selects the arthrocentesis or injection code. A knee is a large joint.
Judicial review
the fifth level of Medicare appeal: a civil action in federal district court, with a higher amount-in-controversy threshold, adjusted annually.
JW modifier
drug amount discarded and not administered to any patient, reported on a separate line with the discarded units.
JZ modifier
zero drug amount discarded; an affirmative attestation that nothing was wasted. Exists because a claim with no JW line was ambiguous between "nothing wasted" and "waste not reported."
K
Kidney transplant status versus complication
a functioning transplant with residual chronic kidney disease is coded with the CKD code and the transplant status code, and is not a transplant complication.
Knee compartments
the medial, lateral, and patellofemoral divisions of the knee, in terms of which several arthroscopy codes are written and which must be named in the operative note.
Knowingly (False Claims Act)
actual knowledge, deliberate ignorance of truth or falsity, or reckless disregard of truth or falsity. No specific intent to defraud is required.
KX modifier
an attestation, appended above an outpatient therapy threshold, that the services are medically necessary and the documentation in the record supports it.
L
Late entry
documentation of an earlier event recorded now, identified as a late entry, carrying the current date and stating the date of the service being documented.
Laterality
the right/left/bilateral distinction, typically carried in the fifth or sixth character. Digit assignments, the availability of a bilateral option, and the character position all vary by category and must be verified.
LCD reconsideration
the public process by which anyone may request that an existing LCD be revised, with supporting evidence.
Leading query
a query that supplies the answer, names a code, states a financial consequence, or otherwise signals a preferred response. Improper, and at scale an enforcement exposure.
Legal health record
the set of documentation an organization declares by policy to be its official business record, produced in response to a subpoena or records request.
Lesion excision measurement
the lesion's greatest diameter plus the narrowest margins required, measured before excision. Not the pathology specimen, which shrinks in formalin, and not the defect, which is the repair's measurement.
Levels of Medicare appeal
the five-step statutory ladder: redetermination (MAC), reconsideration (QIC), ALJ hearing (OMHA), Medicare Appeals Council, judicial review. Climbed in order, each level reviewing the one below.
Liability modifiers
GA (an ABN was obtained for a service expected to be denied as not reasonable and necessary), GX (voluntary notice for a statutorily excluded service), GY (statutorily excluded), and GZ (expected denial with no ABN obtained — an admission, and the patient may not be billed).
Limiting charge
the statutory maximum a non-participating provider may charge a beneficiary on an unassigned claim: 115% of the non-participating fee schedule amount, which is itself 95% of the participating amount.
Line-level posting
posting each service line separately rather than the claim as one number. Every later question about a claim is a line-level question.
List of Excluded Individuals and Entities (LEIE)
the OIG's free, searchable database of excluded persons and entities, against which employers screen.
Local coverage determination (LCD)
a Medicare Administrative Contractor's determination, for its jurisdiction only, of whether a service is reasonable and necessary.
Loop
a level in the 837's hierarchy of information. Loop 2300 is the claim level; Loop 2400 is the service-line level.
M
Machine-readable file
the hospital's published file of standard charges: the gross (chargemaster) charge, every payer-specific negotiated rate, the de-identified minimum and maximum negotiated rates, and the discounted cash price, for every item and service.
Main term
a bold entry in the Alphabetic Index. Main terms are conditions, not body parts; they also include encounter nouns such as Screening, Aftercare, and History, plus eponyms and abbreviations.
Major diagnostic category (MDC)
one of 25 broad groupings, largely by body system, into which the principal diagnosis maps a stay before DRG selection.
Malpractice RVU
the professional liability component; typically the smallest of the three and the most geographically variable.
Manifestation
the effect of an underlying condition in a body system, sequenced second, shown in brackets in the Alphabetic Index, and frequently not reportable alone.
Manipulation
reduction of a fracture; the fragments were manipulated into position. Must be documented as such.
Margins
the rim of normal tissue excised around a lesion, counted on both sides in the excision measurement.
Materiality
the requirement that a false statement be capable of influencing the payment decision.
Maternity global package
one code covering antepartum care, delivery, and postpartum care. Excludes unrelated problems, complications of pregnancy, laboratory other than routine urinalysis, and imaging and other diagnostic procedures.
MCC (major complication or comorbidity)
the higher severity designation; a single MCC among the secondary diagnoses places the stay in the "with MCC" tier.
MEAT criteria
monitor, evaluate, assess/address, treat: the industry mnemonic for the evidence a note must contain before a condition may be reported as addressed at an encounter. Any one of the four suffices. It is a teaching device, not a federal regulation; the binding authority is Section IV of the ICD-10-CM Official Guidelines together with the documentation standards and the payment rules' face-to-face requirement.
Medicaid
the joint federal-state program covering low-income and certain other populations, administered by the states within federal requirements, and by law the payer of last resort.
Medical decision making (MDM)
the complexity of problems addressed, data reviewed and analyzed, and risk of complications. One of the two permitted bases for selecting an office visit level.
Medical direction
an anesthesiologist's direction of concurrent procedures performed by qualified individuals, subject to a specific documented set of required steps that is audited as a checklist.
Medical identity theft
the use of another person's identity to obtain care or coverage. Contaminates the victim's medical record permanently, which makes it a patient safety matter before it is a revenue matter.
Medical necessity
a payer's determination, under published criteria, that it will pay for a service. Distinct from a clinician's judgment that a patient needs it.
Medical necessity screening
checking, before the service, whether the ordered diagnosis supports the service under the governing coverage policy.
Medical policy
a commercial payer's published coverage criteria, performing the function of an LCD and its billing and coding article.
Medical record
the complete collection of documentation about a patient's care; in an electronic system a set of linked data rather than a single document.
Medical record number
FL 3b; the facility's identifier for this person, constant across encounters. Not interchangeable with the patient control number.
Medically unlikely edit (MUE)
the maximum units of service a provider would report for a single code, for a single beneficiary, on a single date of service.
Medicare Administrative Contractor (MAC)
the private company under contract with CMS that processes claims for a jurisdiction, publishes local coverage determinations and billing and coding articles, enrolls providers, conducts medical review, and decides the first level of appeal.
Medicare Administrative Contractor (MAC), as a reviewer
the entity that processes your Medicare claims and also conducts medical review under the Medicare Program Integrity Manual, before or after payment; it effects most recoveries, including those other contractors identify. (Ch.3 owns the term; Ch.37 owns its review role)
Medicare Appeals Council
the fourth level of Medicare appeal, within the HHS Departmental Appeals Board; reviews ALJ decisions on request or on its own motion.
Medicare Part A (Hospital Insurance)
covers inpatient hospital, skilled nursing facility, home health, and hospice, with a deductible per benefit period rather than per calendar year.
Medicare Part B (Medical Insurance)
covers physician services, outpatient hospital, durable medical equipment, clinical laboratory, and most preventive services; an annual deductible then 20% coinsurance, with no out-of-pocket maximum.
Medicare Part C (Medicare Advantage)
Parts A and B, usually with Part D, delivered by a private plan under contract with CMS, with networks, referrals, prior authorization, an out-of-pocket maximum, and its own appeal process.
Medicare Part D
outpatient prescription drug coverage delivered through private plans.
Medicare Physician Fee Schedule
the schedule of allowed amounts produced by the RVU, GPCI, and conversion factor arithmetic.
Medicare Secondary Payer (MSP)
the statutory provisions defining when another payer pays before Medicare, including the 20-employee threshold for age-65 entitlement with active employment and the 100-employee threshold for disability entitlement.
Medicare Secondary Payer questionnaire (MSPQ)
the standard instrument for determining whether another payer is primary to Medicare. A sequence of questions, not a form.
Medicare Summary Notice (MSN)
the quarterly statement sent to Original Medicare beneficiaries listing what was charged, what Medicare approved, what Medicare paid, and the maximum the beneficiary may be billed.
Metric pairing
the dashboard discipline of never showing a gameable number without its detector: days in AR with write-offs, net collection rate with underpayment findings, denial rate with rejection rate, collections with preventable write-offs.
MI initial and subsequent
an acute myocardial infarction is coded as acute for four weeks (28 days) from onset; a new infarction occurring within that period is coded from the subsequent category, with both the subsequent and the initial codes reported.
Minimum necessary
the standard requiring uses and disclosures of PHI to be limited to the minimum needed to accomplish the purpose. Applies to payment and operations; does not apply to treatment.
MIPS (Merit-based Incentive Payment System)
the fee-for-service track of Medicare's Quality Payment Program, created by MACRA in 2015: four performance categories (quality, cost, improvement activities, promoting interoperability) combined into one final score against a performance threshold, producing a Part B payment adjustment applied two years after the performance year. Every parameter is set by annual rulemaking.
Modality
the imaging technology used: radiography, computed tomography, magnetic resonance, ultrasound, or nuclear.
Model drift
degradation of a model's performance over time as the world it was fitted to changes, with no change in the model itself: revised code sets, changed documentation, and — the driver nobody monitors — a changed definition of what counts as supported.
Moderate (conscious) sedation
drug-induced depression of consciousness in which the patient responds purposefully to verbal commands and maintains a patent airway and adequate cardiovascular function. Not general anesthesia, monitored anesthesia care, or minimal sedation. Separately reportable since being unbundled from the procedures that formerly included it.
Modifier
a two-character suffix reporting that a service was altered by a specific circumstance without changing the code's definition. A factual assertion made on a document carrying a certification.
Modifier 22
increased procedural services, where the work substantially exceeded that typically required. Requires documentation and a special report and triggers manual review.
Modifier 52 / 53
reduced services (partially reduced or eliminated at the physician's discretion) and discontinued procedure (terminated after induction because continuing threatened the patient), respectively.
Modifier 90
reference (outside) laboratory; identifies a test performed by an outside laboratory and billed by the reporting entity.
Modifier 91
a repeat clinical diagnostic laboratory test performed to obtain subsequent results. Not for repeats caused by equipment failure or specimen problems.
Modifier indicator
the PTP edit field stating whether a modifier may override the edit: 0 never, 1 possibly if circumstances and documentation support it, 9 the edit does not apply. An indicator of 1 is a permission, not an authorization.
Modifier QW
identifies a CLIA-waived test performed by a site holding a Certificate of Waiver.
Modifier sequencing
the ordering of modifiers on a claim line: payment modifiers first, then informational, with the greatest reimbursement effect first among payment modifiers, subject to payer policy.
Modifier-51 exempt
a code marked with a circle-and-slash symbol to which modifier 51 is not appended. A separate list from the add-on codes; all add-on codes are exempt, but not all exempt codes are add-on codes.
Mohs micrographic surgery
staged excision with microscopic margin examination in which a single physician acts as both surgeon and pathologist. Coded by anatomic area, stage, and tissue blocks. The pathology is not separately reported; the repair is.
the classification unit of IPPS: a group of clinically coherent, similarly resourced hospital stays, severity-split by CC/MCC status, to which the payment's relative weight attaches.
MUE adjudication indicator (MAI)
the field stating how an MUE is applied and whether it can be exceeded: 1 a claim line edit, splittable across lines with modifiers; 2 an absolute policy-based date-of-service edit that cannot be exceeded; 3 a clinical benchmark that may be exceeded on appeal with documentation.
Multiple procedure indicator
the Physician Fee Schedule column stating which reduction methodology applies to a code: standard, endoscopic base-code, another reduction, or none.
Multiple-procedure discounting (OPPS)
the rule paying the highest-rated status T procedure in full and each additional status T procedure at fifty percent; status S procedures are exempt, and modifiers 73 and 74 apply the same discount logic to discontinued procedures.
Multiple-procedure payment reduction
payment of the highest-valued procedure in full and of additional procedures at a reduced percentage of their allowed amount. The percentage and the number of procedures discounted vary by payer.
Mutually exclusive
the edit rationale under which two procedures could not reasonably both have been performed, or represent two ways of doing the same thing. Invites the question "did both of these actually happen?"
N
N19
remark code: procedure code incidental to the primary procedure.
National Correct Coding Initiative (NCCI)
CMS's published set of edits stating which code combinations and unit quantities are payable. Free, updated quarterly.
National coverage determination (NCD)
a nationwide CMS decision on whether Medicare covers an item or service, binding on all Medicare Administrative Contractors.
Natural language processing (NLP)
the computational extraction of structured meaning from unstructured text; in coding, the step that turns a clinician's prose into clinical concepts to which a code can attach.
NCCI Policy Manual
CMS's free annual publication stating the policies behind the edits, organized as a general correct coding policies chapter followed by chapters corresponding to the CPT sections.
NCHS (National Center for Health Statistics)
the CDC component that maintains ICD-10-CM.
NDC
National Drug Code; identifies the labeler, product, and package size of a drug product.
NDC-to-HCPCS conversion
the reporting of both identifiers on one claim line with different quantities in different units of measure, which is correct rather than an error.
NEC (not elsewhere classifiable)
the documentation is specific and the classification has no code for it. The limitation is the code set, and a query cannot fix it.
Negation detection
the natural language processing step that decides whether a concept found in the text is asserted or denied; the first of the four qualifiers, with experiencer, temporality, and certainty.
Neoplasm behavior
the classification of a neoplasm as malignant primary, malignant secondary, carcinoma in situ, benign, uncertain behavior, or unspecified behavior. Determines the Table of Neoplasms column and must be documented.
Net collection rate
payments divided by what the organization was entitled to collect after contractual adjustments. Measures conversion of entitled revenue into received revenue, and cannot see lost charges, undercoding, or underpayments written off as contractual.
New patient
a patient who has not received any professional service from the reporting physician or other qualified health care professional, or from another physician or QHP of the exact same specialty and subspecialty belonging to the same group practice, within the past three years.
No Surprises Act
the federal surprise-billing statute enacted in December 2020 (Consolidated Appropriations Act, 2021), effective January 1, 2022: balance billing protections for emergency services, out-of-network providers at in-network facilities, and air ambulance; in-network cost sharing for protected claims; good faith estimates for the uninsured and self-pay; and independent dispute resolution between plans and providers.
Non-covered charges
FL 48; charges the facility is reporting but not asking the payer to pay. The difference between FL 47 and FL 48 is what is being requested.
Non-integral sign or symptom
a sign or symptom not routinely associated with the documented disease process, which is separately coded when present.
Non-participating provider (Medicare)
one who may accept assignment claim by claim, is paid 95% of the fee schedule amount, and on unassigned claims may collect from the beneficiary only up to the limiting charge.
Nonessential modifier
a word in parentheses following a main term or subterm. Alternate wording that does not change the code and need not appear in the documentation.
NOS (not otherwise specified)
equivalent to unspecified; the documentation lacks the detail needed for a more specific code. The limitation is the record, and a query may fix it.
Notice and consent
the No Surprises Act's narrow exception permitting some out-of-network providers at in-network facilities to balance bill, only with advance standard-form notice, an estimate, and consent — and never for emergency services before stabilization or for the ancillary specialties (anesthesiology, pathology, radiology, and their companions).
NPI
the National Provider Identifier, a ten-digit identifier. It proves identity and nothing else — not enrollment, participation, or eligibility to be paid.
NU / UE / RR
modifiers identifying durable medical equipment as new and purchased, used and purchased, or rented.
NUBC
the National Uniform Billing Committee, which maintains the UB-04 and publishes the Official UB-04 Data Specifications Manual. Unlike the NUCC's manual for the professional form, it is sold by subscription.
NUCC
the National Uniform Claim Committee, which maintains the CMS-1500 and publishes its free reference instruction manual.
O
OA — other adjustment
used when neither CO nor PR applies; most commonly coordination of benefits.
Observation
a hospital service that is outpatient in status regardless of where the patient sleeps or how long the stay lasts.
Obstetric global package
antepartum care, delivery, and postpartum care reported with one code (59400 vaginal, 59510 cesarean); operationally, the episode a practice must be able to prove it furnished in full before reporting it that way. (Ch.35; the package's definition and exclusions are Ch. 18 §18.6)
Obstetric priority
ICD-10-CM chapter 15 codes take sequencing priority over codes from other chapters, unless the provider documents that the condition is not affecting the pregnancy.
Obstetric trimester rules
most chapter 15 categories carry a trimester character determined by the provider's documented weeks of gestation at the time of the encounter, with an additional code identifying the weeks of gestation.
Occurrence code
a circumstance code reporting a date on which something significant happened.
Occurrence span code
a circumstance code reporting a date range.
Official Guidelines for Coding and Reporting
the rules for assigning and sequencing ICD-10-CM codes, approved jointly by NCHS, CMS, the American Hospital Association, and AHIMA; reissued annually, free, and required. A code assigned against them is incorrect, not merely unconventional.
Offset
the mechanism by which a takeback is collected: reducing a future payment rather than requesting a check.
Offshore coding
outsourcing to a workforce outside the United States. A business associate relationship under HIPAA whose obligations extend to subcontractors, and subject to additional program, payer, and state constraints that vary by contract and change.
OIG Work Plan
the HHS Office of Inspector General's published, continuously updated list of active and planned audits and evaluations, each with a stated issue and expected report date; free, public, and the closest thing the field has to a forecast of what will be scrutinized.
Old myocardial infarction
a healed infarction after the acute period, requiring no further care.
Open treatment
fracture treatment in which the fracture is surgically opened and visualized, or opened remotely for fixation.
Operating provider
FL 77; the provider who performed a reported surgical procedure. Conditionally required when FL 74 carries a procedure.
Operating rules
requirements adopted on top of the transaction standards, chiefly governing what an eligibility or claim status response must actually tell you. They exist because "compliant" and "useful" turned out to be different things.
Operative report
the account of a surgical procedure: pre- and postoperative diagnoses, procedure performed, findings, and a narrative description. The body, not the heading, determines the code.
Opt-out
a status under which a physician furnishes services to beneficiaries under private contract, submits no claims, receives nothing from Medicare, and is not bound by the limiting charge.
Ordering versus performing
the distinction determining who bills a diagnostic test: the performing entity bills it, and the ordering physician appears on the claim as the referring provider.
Organ or disease-oriented panel
a defined group of laboratory tests, reportable only when every component test was performed, and not to be unbundled into components when it was.
Origin and destination modifier
the two-character ambulance modifier whose first character identifies where the transport began and whose second identifies where it ended.
Out-of-network provider
a provider with no contract with the payer; no contracted allowed amount exists, cost sharing is higher, and under some plan designs there is no benefit at all.
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.
Outcome measure
a quality measure of the result achieved — the value controlled, the readmission avoided. What people actually care about, and unfair without risk adjustment and sound attribution.
Outcome of delivery
a code reported on the maternal record when a delivery occurs; not reported on the newborn's record or on antepartum encounters.
Outlier payment
the additional IPPS payment for extraordinarily costly stays, beginning only after estimated costs exceed the DRG payment plus an annually set fixed-loss threshold, and covering only a share of costs beyond it.
Outpatient Code Editor (OCE)
the quarterly-updated CMS software through which Medicare's contractors process outpatient facility claims; it edits the claim (validity, coding, units, combinations, setting, hospital NCCI and MUE) and assigns the status indicator, APC, and payment flags that drive the pricer.
Outpatient Prospective Payment System (OPPS)
Medicare's payment system for hospital outpatient services: prospective payment per service through ambulatory payment classifications, wage-adjusted and budget-neutral by law, effective August 1, 2000 and revised annually by rule.
Outsourcing
contracting a revenue cycle function — coding, billing, denial management, or all of it — to another organization. It relocates the production work and creates oversight work; it never relocates the certification on the claim.
Overpayment
money received or retained to which the practice is not entitled after ordinary reconciliation. A legal category, not a clerical one: a credit balance is what the ledger shows; an overpayment is what the law sees once you know why.
Overturn rate
appeals decided in the practice's favor, divided by appeals decided. Meaningful only when computed by category.
P
Packaging
payment for a service made as part of the payment for a primary service rather than separately, producing a remittance line with charges and zero allowed. Not a denial.
Pain coding conventions
G89 is not assigned when the definitive underlying diagnosis is known, unless the encounter is for pain management, in which case the G89 code is sequenced first. There is no duration rule distinguishing acute from chronic pain; the provider's documentation governs.
Parenthetical note
an instruction printed in parentheses near a code. Five kinds: cross-references, prohibitions, requirements, conditional instructions, and deletion notices. Binding.
Participating provider (Medicare)
one who has agreed to accept assignment on all Medicare claims and is paid the full fee schedule amount.
Patient access
the front-end function comprising scheduling, registration, insurance verification, authorization, and financial clearance.
Patient control number
FL 3a; the facility's identifier for this encounter, returned by the payer on the remittance so the payment can be posted.
Patient discharge status
the two-digit code in FL 17 stating where the patient went at the end of the stay. It decides more money than any other small field on the form.
Patient estimate
a pre-service statement of what the patient will likely owe, built from the allowed amount and the benefit design — never the charge — together with its assumptions (deductible status and its date, the setting, what could change the number) stated plainly.
Patient responsibility
the portion of the allowed amount the patient owes under their benefit design: deductible, copayment, coinsurance, or a combination.
Patient statement
the practice's bill to the patient: what is owed, for what, and how to resolve it — the patient's remittance advice. A well-designed statement answers seven questions, shows every credit, and issues only after the balance is final.
Patient versus insured
the distinction underlying items 2 and 4. The person receiving care and the person holding the policy are frequently different.
Patient-provider dispute resolution
the No Surprises Act process by which an uninsured or self-pay patient billed substantially more than the good faith estimate (a defined dollar threshold — verify current) can take the bill to an independent dispute resolution entity, which can limit the bill toward the estimated amount.
Payer
the entity financially responsible for a claim: a commercial insurer, a government program, a self-funded employer plan, or in some circumstances the patient.
Payment modifier
a modifier affecting reimbursement through a reduction, increase, split, or separate payment. Sequenced before informational modifiers.
Payment plan
a written agreement to resolve a patient balance in scheduled installments — the patient's version of the payer contract — with the collection machinery frozen while the plan is current.
Payment posting
recording, against each service line, what the payer allowed, paid, adjusted, and assigned to the patient.
PC/TC indicator
the Physician Fee Schedule column stating whether and how a code may be split into professional and technical components.
Peer-to-peer review
a conversation between the treating physician and a payer's physician reviewer about a specific case, generally available after an adverse determination and within a window.
Per diem
a daily rate for an inpatient stay, sometimes tiered by level of care.
Per member per month (PMPM)
the unit of payment and of measurement in capitated and risk-adjusted arrangements.
Percentage of Medicare
the common expression of a commercial contract's rates against the Medicare Physician Fee Schedule. The realized percentage depends on service mix.
Permanent code
a HCPCS Level II code maintained through the public quarterly process with a formal application procedure.
Personal history of malignant neoplasm (Z85)
assigned when a primary malignancy has been excised or eradicated, no further treatment is directed to that site, and there is no evidence of remaining malignancy. All three conditions are required.
Physical status modifier (P1–P6)
a modifier describing the patient's systemic condition. P3 through P5 generally add units; P1, P2, and P6 generally do not.
PI — payer initiated reduction
a reduction the payer made on its own initiative rather than under the contract's terms.
Place of occurrence
an external cause code identifying where an event happened; reported once, at the initial encounter only.
Place of service code
the two-digit claim field identifying where a service was furnished, which selects the facility or non-facility practice expense value.
Placeholder X
a character filling an empty position when a code requires a seventh character but has fewer than six. It holds a position open rather than padding an end, and it is not optional.
POA indicator
the present-on-admission value (Y, N, U, W, or exempt) reported with each diagnosis on an inpatient claim; U is treated like N for HAC payment purposes, W like Y.
Point-of-service collection
collection of patient responsibility at or before the encounter.
Poisoning
a drug taken incorrectly: wrong substance, wrong dose, wrong person, or taken contrary to instruction.
POS (point of service)
a plan combining gatekeeping and referrals for its in-network tier with an out-of-network benefit at higher cost.
Postoperative component
typical follow-up care through the end of the global period, included in the package.
Postpartum care
the outpatient visits following delivery, included in the global obstetric package.
Postpayment review
review of claims already paid; where the reviewer disagrees, the result is an.
Potentially misvalued code
a formal category of codes identified for revaluation, through which a code's relative values may decrease.
PPO (preferred provider organization)
a plan with out-of-network coverage at a higher cost share, generally without gatekeeping or referral requirements.
PR — patient responsibility
an adjustment the patient owes: deductible (PR-1), coinsurance (PR-2), copay (PR-3), or a non-covered amount for which the patient is liable.
Practice expense RVU
the overhead component, published in separate facility and non-facility values.
Practice management system (PMS)
the system owning the financial record: demographics, guarantor, insurance, scheduling, charges, claims, payments, adjustments, accounts receivable, and statements.
Precertification
generally a synonym for prior authorization; in some plans a distinct admission notification requirement. Ask what the payer means by it.
Precision
of the codes an engine suggested, the share supported by the record; a precision failure is a false positive.
Predetermination
a non-binding advance review of whether a service would be covered. Not an authorization and not a payment guarantee.
Premium
the recurring price of holding coverage, paid to the plan regardless of whether care is used. It never appears on a claim and is never paid to a provider.
Preoperative component
for a 090-day global period, the day before surgery, included in the package.
Prepayment review
review that occurs before adjudication: matching claims suspend, records are requested, and the claim is paid, reduced, or denied on the documentation. It creates no debt; it costs calendar, cash cycle, and labor.
Prescription drug management
prescribing, adjusting, discontinuing, or documenting a decision to continue a prescription medication. Reaches moderate risk. A medication list is not management.
Pressure ulcer staging
pressure ulcers coded by site and stage, where the stage may be taken from another clinician's documentation provided the provider has documented the ulcer itself. Unstageable and deep tissue injury categories are distinct from unspecified stage.
Presumptive drug testing
testing indicating the presence or absence of a drug or drug class.
Presumptive eligibility
granting financial assistance without a completed application, based on information the organization already has or can obtain (means-tested program enrollment, prior determinations, credit-derived indicators, returned mail, and similar signals). The remedy for the application-based path's systematic failure.
Preventable administrative write-off
a write-off caused by the practice's own process failure: timely filing, missing authorization, credentialing, registration. The category that pays for itself.
Preventable denial
one a process could have stopped. It does not mean anyone erred; a correct claim can produce a preventable denial.
Preventive medicine services
the comprehensive periodic evaluation family (99381–99387 new, 99391–99397 established) selected by patient age and new-versus-established status rather than by medical decision making or time, and defined by required content.
Price transparency (hospital)
the federal requirement (in force since January 1, 2021) that each hospital publicly post a machine-readable file of all standard charges and a consumer-friendly display of shoppable services. (Ch.32; introduced descriptively in Ch. 23 §23.8)
Price transparency requirements
obligations on hospitals to publish a machine-readable file of standard charges, including payer-specific negotiated rates, and a consumer-friendly display of shoppable services.
Primary site
the anatomical site where a malignancy originated.
Principal diagnosis
inpatient: the condition established after study to be chiefly responsible for occasioning the admission of the patient to the hospital for care.
Principal diagnosis (inpatient)
the condition established after study to be chiefly responsible for occasioning the admission of the patient to the hospital for care; defined by the UHDDS and governed by Section II of the Official Guidelines.
Prior authorization
a coverage determination made before a service, on submitted clinical information. Not a payment guarantee, and tied to a specific code, date range, units, facility, and sometimes rendering provider.
Probe audit
a small, deliberately limited first review, on the order of ten to thirty items, whose purpose is to decide whether a fuller review is warranted. Never a basis for an error rate or a projection.
Problems addressed
problems evaluated or treated at the encounter by the reporting professional, including consideration of further testing or treatment that is declined. Notation of a problem managed by another professional, without additional assessment or care coordination, is not addressed.
Procedure-to-procedure (PTP) edit
a directional pairing of two codes in which one is payable and the other is not separately payable when both are reported for the same patient, date, and provider.
Process measure
a quality measure of whether the right action was taken — the test ordered, the exam performed, the assessment documented. Attributable and actionable; only weakly linked to whether the patient benefited.
Proctored exam
an examination administered under supervised, controlled conditions, at a testing center or by remote proctor, with published rules governing identification, permitted materials, and the testing environment.
Productivity standard
the expected volume of encounters, charts, or claims per unit of time. Setting-specific, and meaningless without a comparable unit of work.
professional
services coding across ICD-10-CM, CPT, and HCPCS Level II. The default credential in the ambulatory world.
Professional claim
the claim reporting the physician's or QHP's own work, submitted on the CMS-1500 as an 837P.
Professional component
the licensed clinician's own cognitive or procedural work. Billed on a CMS-1500.
Professional component (modifier 26)
the physician's interpretation and written report. There is no professional component without a written report.
Professional network
the small set of people through whom rule changes, payer behavior, and job openings reach you before they reach your denial queue: a local chapter or component association, colleagues at other organizations, a payer's provider representative, a vendor's implementation lead. An information system, not a social nicety.
Prolonged services
additional complete 15-minute increments of total time beyond the highest-level code's requirement. CPT reports 99417; Medicare reports G2212 with a different starting threshold.
Proof of timely filing
evidence that a claim was submitted within the payer's window. Strongest is a payer acknowledgment naming the claim; weakest is the practice's own system history.
Propensity to pay
a score predicting the likelihood a patient balance will be paid, built from payment history, balance size, coverage status, and credit-derived data. Legitimate as segmentation; honestly used, a low score routes to assistance screening before collection pressure, because it predicts FAP eligibility as well as nonpayment.
Proprietary edit
a payer's own clinical editing rule, frequently unpublished, that is not an NCCI edit.
Prospective chart review
review conducted before an encounter, producing information for the clinician, usually a list of previously documented conditions not yet addressed this year. Legitimate when the prompt asks the clinician to evaluate; improper when it asks the clinician to affirm.
Protected health information (PHI)
individually identifiable health information held or transmitted by a covered entity or business associate.
Provider
the entity or clinician furnishing the service. Where the distinction matters, the rendering provider performed the service and the billing provider submits the claim.
Provider-based billing
billing by a hospital-owned outpatient department, generating both a professional and a facility claim for an encounter that resembles an office visit, generally with higher patient cost-sharing.
Provider-based department
a department of a hospital, which may be physically off the hospital's main campus, that meets CMS's provider-based requirements and therefore bills a facility claim under OPPS in addition to the clinician's professional claim.
Provider-level adjustment
the remittance section for amounts applied to the provider rather than to a claim: offsets, interest, capitation, penalties, advance payments.
Provider-performed microscopy
a defined set of microscopy procedures performed personally by the provider during a patient encounter on specimens not easily transportable.
Purchased diagnostic test
a test or interpretation bought from an outside supplier and billed by the purchaser, subject to anti-markup payment limitations and disclosure requirements.
Q
Q-code
a temporary national code for a wide range of items and services, including casting and splinting supplies.
Qualified Independent Contractor (QIC)
the contractor, organizationally independent of the MAC, that decides Medicare reconsiderations on the record.
Qualified Medicare Beneficiary (QMB)
a dual-eligible category whose members may not be billed by providers for Medicare deductibles, coinsurance, or copayments, regardless of what the state actually pays.
Qualified payment amount (QPA)
under the No Surprises Act, in general terms the plan's median contracted rate for the service in the geographic area; the usual basis for computing the protected patient's in-network cost sharing.
Qualifying circumstances
add-on codes describing anesthesia complicated by extreme age, extreme hypothermia, controlled hypotension, or emergency conditions.
Quality measure
a standardized calculation applied to a defined population to produce a rate, composed of a denominator (who is eligible), a numerator (who met the standard), and stated exclusions.
Quality standard
the expected accuracy rate on review. Always ask whether it is measured per chart or per code; identical work produces very different numbers.
Query
a written request to a provider to clarify documentation that is conflicting, ambiguous, incomplete, illegible, or clinically inconsistent in a way affecting code assignment.
Query response
the clinician's answer to a query; it counts only when it is documented in the medical record itself, since a code may never be assigned from an answer that exists only on the query form.
Qui tam
the False Claims Act provision permitting a private relator to file suit on the government's behalf, under seal, and to share in any recovery.
R
Re-aging
the practice of resetting an account's age when it is rebilled or touched. Occasionally defensible for specific events; as a default it makes badly worked AR look perpetually young.
Real time
the mode in which a single transaction is sent and answered in seconds. How eligibility works.
Reasonable and necessary
the statutory standard at Social Security Act § 1862(a)(1)(A), excluding from Medicare payment items and services not reasonable and necessary for the diagnosis or treatment of illness or injury. Written as an exclusion and undefined by the statute.
Recall
of the codes the record supported, the share the engine found; a recall failure is a false negative.
Reconsideration
the second level of Medicare appeal: an on-the-record review by a Qualified Independent Contractor, filed within 180 days of the redetermination. The record substantially closes here.
Recoupment
a payer's recovery of a prior overpayment, typically by demand letter followed by offset against future remittances. A recoupment is a determination: it can be verified, repaid, or appealed — and on Medicare the fast-filed first-level appeal pauses it.
Recovery Audit Contractor (RAC)
a contingency-fee contractor that identifies Medicare overpayments and underpayments already made, through automated, semi-automated, and complex review, with its review issues approved by CMS and published in advance.
Red drop-out ink
the printing specification allowing a scanner to read a paper claim's contents while ignoring the form's own printed lines.
Redetermination
the first level of Medicare appeal: a fresh review by the Medicare Administrative Contractor, by staff not involved in the initial determination. Filed within 120 days; no minimum amount.
Reference laboratory
an outside laboratory that performs and bills for tests it receives.
Referral
a primary care physician's direction of a patient to a specialist. About who the patient sees, and generally the referring physician's to issue.
Referring provider
the ordering physician as identified on a diagnostic claim, by name and national provider identifier.
Registration
capture of the patient's demographic, coverage, and guarantor information at or before the encounter.
Rejection
a claim that never reached adjudication. No decision, nothing to appeal, and the timely filing clock never stopped.
Rejection rate
claims never adjudicated, expressed as a rate. It belongs beside the denial rate, because rejections never appear in one.
Rejection versus denial
a rejection was never adjudicated, is not in the payer's system, has nothing to appeal, and did not stop the timely filing clock. A denial is a decision.
Relative value unit (RVU)
a measure of the resources required to provide a service, relative to other services. A ratio, not a dollar amount.
Relative weight
the annually recalibrated factor expressing an MS-DRG's average resource intensity relative to the all-DRG average; multiplied by the base rate to produce the payment.
Relator
the private individual who brings a qui tam action. Protected from retaliation by statute.
Remarks
FL 80; the free-text field on the institutional claim. Not adjudicated, and frequently the field that contains the fact contradicting a coded one.
Remedy
the action taken on a particular claim. What most denial systems record, and what cannot tell you what to fix.
Remittance advice
the payer's explanation of how a claim was adjudicated: what was allowed, adjusted, paid, or denied, and why. Electronic (an 835) or on paper.
Remittance advice remark code (RARC)
a code providing additional explanation. It carries no amount, and it is frequently what makes a CARC actionable.
Remote coding
coding performed away from the site where care was delivered, on records accessed electronically. Structurally ordinary in this field and older than remote work in most office occupations, because the record was already digital. Its real costs are the loss of informal learning, the substitution of production metrics for observation, and a privacy obligation that follows you home.
Remuneration
anything of value, direct or indirect, in cash or in kind. Includes free rent, subsidized staff, discounted equipment, meals, and waived cost sharing.
Rendering provider
the individual who performed the service, identified in items 24I and 24J.
Resequenced code
a code marked with a number sign, printed out of numeric order so that it appears with related codes.
Respiratory failure sequencing
acute respiratory failure may be the principal diagnosis when it is chiefly responsible for the admission; it is a secondary diagnosis when it develops after admission; and chapter-specific priority rules elsewhere may govern. The rule turns on why the patient was admitted, not on severity.
Response to comments
the document published with a final LCD stating what objections were raised during the comment period and why the policy did or did not change.
Resubmission code
the item 22 value indicating a replacement or a void, submitted with the original claim's reference number. Omitting it creates a duplicate rather than a correction.
Retrospective chart review
review conducted after an encounter, comparing submitted diagnoses to the documentation. Defensible only when it deletes unsupported diagnoses as well as adding supported ones.
Revenue code
the four-digit code on each facility claim line identifying the department or cost center that furnished the service. A revenue code says where; a CPT or HCPCS code says what.
Revenue cycle
the complete administrative and financial process of a patient encounter, from scheduling and registration through coding, claim submission, payment, and collection to a zero balance.
Revenue cycle director
the role whose scope is the whole cycle rather than one zone: patient access, coding, billing, denials, accounts receivable, and patient collections, together with the payer, vendor, clinician, and finance relationships that run through them. Chapter 31 §31.11's dashboard is its job description.
Reversal and correction
a reprocessed claim reported twice on one remittance, first with the original amounts inverted and then with the new ones. One event; both halves must be posted.
Reverse false claim
the False Claims Act theory that reaches the knowing concealment or improper avoidance of an obligation to pay money to the government, which is what a retained overpayment becomes after the sixty-day deadline.
Review of systems (ROS)
a systematic inventory of symptoms by body system. Since 2021 it is not a factor in selecting an office visit level.
RHIA (Registered Health Information Administrator)
AHIMA's academic-pathway credential covering the information function and its governance — management, compliance, information governance, systems, analytics; requires a baccalaureate degree from a CAHIIM-accredited program.
RHIT (Registered Health Information Technician)
AHIMA's academic-pathway credential covering the health record as a managed asset — data integrity, coding, privacy, retention, health statistics; requires an associate degree from a CAHIIM-accredited program.
Risk (MDM element)
the risk of complications and/or morbidity or mortality of patient management, including the management options selected and those considered but not selected.
Risk adjustment
the practice of modifying a fixed per-member payment according to a member's expected relative cost, using documented demographics and diagnoses as the predictors; the mechanism that removes an organization's financial incentive to avoid enrolling sick people.
Risk adjustment factor (RAF)
the risk score: one number per member per payment year, built as the demographic component plus one coefficient per surviving condition category plus modeled interactions, normalized so an average member sits near 1.0, and multiplied by a benchmark to produce payment.
Root cause
what produced the denial, as distinct from the remedy, which is what was done about this claim. One missing modifier has five possible root causes.
Root operation
the third character of a Medical and Surgical section ICD-10-PCS code: the precisely defined objective of the procedure (Excision, Resection, Replacement, Extirpation, and the rest), selected from the documented objective rather than the procedure's name.
Root-cause category list
the fixed list from which a denial's cause is chosen. It must contain credentialing and payer error, and must not contain a catch-all.
Routine ABN
an ABN given to every patient for every service as a matter of policy. Improper.
RUC (Relative Value Scale Update Committee)
the separate AMA committee that recommends relative value units to CMS. It decides what codes are worth, not what they are.
Rule of nines
the clinical method for estimating the percentage of total body surface area involved in a burn. The provider documents the percentage; the coder reports it and does not calculate it.
S
S-code
a temporary national code established by non-Medicare payers. Not recognized by Medicare.
Safe harbor
a defined arrangement that, if every element is satisfied, is protected from Anti-Kickback Statute liability. Compliance is all-or-nothing.
Screening versus diagnostic
a test is a screening when the patient has no signs or symptoms of the condition being tested for; the moment a sign, symptom, or diagnosis exists, the test is diagnostic. Determined from the record.
Scrubber
the edit engine that checks claims before submission against format requirements, payer-specific rules, correct coding edits, and locally configured rules.
Scrubber edit
a pre-submission rule checking a claim against what a payer will check. It may stop a claim and ask a question; it may not answer the question.
Secondary site
a metastatic site to which a malignancy has spread from a primary site.
Section
one of CPT's six divisions: Evaluation and Management, Anesthesia, Surgery, Radiology, Pathology and Laboratory, and Medicine. The book is not arranged in numeric order.
Section I
the Guidelines' first section: conventions (I.A), general coding guidelines (I.B), and chapter-specific guidelines (I.C). Applies in all settings.
Section II
selection of the principal diagnosis. Inpatient only.
Section III
reporting of additional diagnoses. Inpatient only.
Section IV
diagnostic coding and reporting for outpatient services, including physician offices, clinics, hospital outpatient departments, emergency departments, and ambulatory surgery.
See
a mandatory cross-reference instruction in the Alphabetic Index.
See also
an advisory cross-reference; another entry may be more appropriate, but the current entry may be used if it contains the needed code.
Segment
a line of data inside a loop, identified by a two- or three-character tag. SV1 is the professional service line; HI carries diagnoses; NM1 carries a name.
Self-disclosure
voluntarily reporting identified conduct to the government: the OIG Self-Disclosure Protocol for conduct implicating civil monetary penalty authorities, and the CMS Voluntary Self-Referral Disclosure Protocol for the physician self-referral law. Distinct from an ordinary refund of a quantified overpayment.
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.
Semicolon convention
CPT's typographic device splitting a descriptor into a common portion before the semicolon and a unique portion after it, with indented codes inheriting the common portion from the code above.
Separate procedure
a descriptor designation indicating that a service is commonly an integral component of a more extensive procedure. Not reported when performed as part of a larger procedure at the same session and site; reported when performed independently or distinctly.
Sepsis
a systemic infection, coded with the code for the underlying systemic infection and sequenced first.
Septic shock
circulatory failure associated with severe sepsis, coded additionally with the underlying systemic infection still sequenced first.
Sequela (7th character S)
a residual effect remaining after the acute phase has ended. The residual condition is sequenced first, the injury code with S second.
Sequela (S)
a residual effect remaining after the acute phase has ended. The residual condition is sequenced first and the injury code with S second; the S code is never reported alone or first.
Sequelae (cerebrovascular)
deficits remaining after the acute phase of a cerebrovascular event, coded from the sequelae category with a code identifying each deficit and, where applicable, whether the affected side is dominant or non-dominant.
Sequencing
the order in which codes are reported, which is a substantive statement read by payer edits, by groupers, and by anyone reading the record afterward.
Sequencing claim lines
ordering claim lines by descending value so that the multiple-procedure reduction is applied to the correct procedures. A mis-sequenced claim can pay less without denying.
Sequential administration
a different substance or drug administered after the initial service through the same access.
Sequential procedure
a procedure attempted by one approach, abandoned, and completed by another. Only the completed procedure is reported.
Service facility
where the service was performed when that is not the billing address, identified in item 32.
Seventh character
the extension identifying the episode of care for injuries and certain other conditions. It describes the kind of care furnished, not the ordinal position of the encounter.
Seventh character (extension)
a character in the seventh position whose meaning depends entirely on context: episode of care in chapter 19, fetus identification in chapter 15, and other meanings elsewhere. Read at the category level in the Tabular.
Severe sepsis
sepsis with associated acute organ dysfunction, requiring the underlying infection code, a severe sepsis code, and a code for each documented acute organ dysfunction.
Shaded area
the upper portion of each service line, carrying supplemental information including NDC data for drug lines, narratives for unlisted codes, and anesthesia minutes.
Shared savings
an arrangement in which an organization is measured against a benchmark for its attributed population and receives a share of the difference when actual expenditures come in below it, typically conditioned on meeting quality standards.
Shoppable service
a service that can be scheduled in advance, subject to the consumer-friendly display requirement (plain-language description plus customary ancillary services); a compliant price-estimator tool can satisfy the display.
Signature attestation
a separate signed statement identifying the author of an unsigned entry and attesting that they furnished and documented the service. It authenticates only; it cannot add content and cannot supply a missing signature on an order.
Signature on file
the phrase entered in items 12 and 13 in place of a signature, asserting that a signed and current authorization exists.
Significant and separately identifiable (modifier 25)
an evaluation and management service performed on the same day as a minor procedure that is above and beyond the usual pre- and post-procedure work included in the procedure's payment. A different diagnosis is not required.
Simple repair
one-layer closure of a superficial wound. Included in lesion excision codes and not separately reportable with them.
Single-dose vial
a container intended for a single patient, whose unused remainder is waste. Multi-dose vials have no waste in this sense.
SIRS (systemic inflammatory response syndrome)
a set of physiologic criteria used in earlier clinical sepsis definitions; the classification's treatment of it and its relationship to sepsis has been revised and must be verified currently.
Site of service differential
the payment difference produced by the separate facility and non-facility practice expense RVUs.
Situational
an implementation guide's third requirement level, between required and not used: required when a stated condition applies. Where every payer companion guide lives.
Sixty-day rule
the requirement that an identified overpayment from a federal health care program be reported and returned within sixty days of identification; a retained overpayment becomes an obligation under the False Claims Act.
Small balance write-off
the deliberate, written, uniform policy of not pursuing balances below a threshold derived from the cost of pursuit. Applied to instances, never to patterns, and never to credits.
SOAP note
the traditional clinical note structure: Subjective, Objective, Assessment, Plan. Rarely labeled in modern systems and almost always still present architecturally.
Soft denial
a denial that is still recoverable by correction, supply of information, or appeal. Time turns a soft denial into a hard one.
Special report
the narrative accompanying an unlisted procedure code, describing the nature, extent, and need for the procedure together with the time, effort, and equipment involved.
Specialty coding
coding the same three code sets under a specialty's own volume slice, payment convention, source document, policy landscape, and documentation vocabulary; not a separate code set and not a separate discipline.
Split (or shared) visit
an E/M service performed jointly by a physician and a non-physician practitioner of the same group in a facility setting, reported by whichever performed the substantive portion.
Split global modifiers (54, 55, 56)
modifiers apportioning a global surgical package among physicians: 56 preoperative management only, 54 surgical care only, 55 postoperative management only. Each physician reports the same procedure code, and the transfer of care must be agreed and dated.
Stable chronic illness
for MDM purposes, a chronic illness at its treatment goal. Not merely unchanged since the last encounter.
Staged procedure
a planned or related subsequent procedure performed during a postoperative period, reported with modifier 58.
Standard code sets
the code sets HIPAA adopted for the standard transactions: ICD-10-CM, ICD-10-PCS, CPT, HCPCS Level II, CDT.
Standard identifiers
the NPI for providers and the EIN for employers. The reason legacy payer-assigned provider numbers disappeared from claim forms.
Standard paper remittance (SPR)
the printed remittance. Same information as the ERA; it must be keyed or scanned.
Standard written order
the order that must generally be in a supplier's possession before a DMEPOS claim is submitted. It establishes that an order was written, not that the item was medically necessary.
Standards of medical and surgical practice
the principle that services integral to the performance of a procedure are included in it and not separately reportable.
Stark Law (physician self-referral law)
42 U.S.C. § 1395nn; a civil, strict-liability prohibition on physician referrals for designated health services payable by Medicare to entities with which the physician or an immediate family member has a financial relationship, absent an exception.
Statement covers period
FL 6; the date range the claim covers. Every service date must fall inside it, and interim claims must not overlap.
Statistical sampling
the discipline that makes a projection from a sample defensible: a defined universe, an enumerated sampling frame, units drawn by a documented random method, and an estimate reported with its precision.
Status category code
the broad answer on a 277CA: received, accepted for processing, or returned.
Status code
a Z-code describing a condition, device, or state the patient carries that affects care without being the reason for the encounter.
Status indicator
the one- or two-character code assigned to every HCPCS code in the OPPS addenda announcing how a line is paid on an outpatient hospital claim: separately under OPPS, packaged, under another payment system, or not at all.
Statutorily excluded
not a Medicare benefit at all. No ABN is required and the patient may be billed; reported with GY, plus GX where a voluntary notice was given.
Statutorily excluded service
a service that is not a Medicare benefit at all, regardless of documentation or medical necessity.
Subcategory
the fourth through sixth characters, adding etiology, anatomic site, severity, or laterality.
Subrogation
a health plan's right to recover amounts it paid out of a patient's later liability settlement.
Subsection
a division within a section, frequently carrying its own guidelines and notes.
Subsequent encounter (7th character D)
an encounter after active treatment is complete, during routine healing or recovery.
Subsequent encounter (D)
an encounter after active treatment is complete, during routine healing or recovery. A patient's first visit to a new provider taking over follow-up is coded D.
Subsequent hospital inpatient or observation care
any service after the initial one by that professional or their same-specialty group.
Substantial portion methodology (the eight-minute rule)
Medicare's conversion of total timed minutes to units: 8–22 minutes is one unit, 23–37 is two, 38–52 is three, and so on. Total all timed minutes before converting.
Substantive portion
the criterion determining which professional reports a split/shared visit. Its definition has changed more than once and must be verified against current guidance.
Subterm
an indented entry beneath a main term. Indentation level is meaning: each level narrows the one above it.
Superbill (encounter form)
a checklist of a practice's common codes marked by a provider. A communication tool, not a coding decision, and it decays with every update cycle.
Supplemental Medical Review Contractor (SMRC)
a national contractor performing medical review on topics CMS assigns; it does not recover money but refers its findings to the MAC.
Surgical package
the set of services always included in a surgical procedure's payment in addition to the operation itself: the evaluation after the decision for surgery, local anesthesia, immediate postoperative care, orders, recovery-room evaluation, and typical follow-up.
Surgical partition
the grouper step deciding whether a stay takes a surgical or medical DRG family, driven by the presence of an OR-designated ICD-10-PCS procedure code.
Surgical pathology levels
the code structure for specimen examination, with the specimen — each separately identified and separately submitted — as the unit of service.
Surprise billing
the pre-2022 pattern the No Surprises Act addresses: an out-of-network balance bill for care the patient could not have chosen their way out of — emergency care, or an out-of-network provider at an in-network facility. Its defining feature: no decision available to the patient would have avoided it.
T
T-code
a code established for state Medicaid agencies. Not recognized by Medicare.
TA1
the interchange acknowledgment: whether the envelope itself was readable.
Table of Drugs and Chemicals
a grid of substances against six columns: poisoning accidental, intentional self-harm, assault, and undetermined; adverse effect; and underdosing.
Table of Neoplasms
a grid of anatomical sites against six behavior columns: malignant primary, malignant secondary, carcinoma in situ, benign, uncertain behavior, and unspecified behavior. The behavior must be documented before the table can be used.
Tabular List
the volume organized by classification structure, containing the complete codes and every instruction that governs them. Step two of the two-step rule, always.
Takeback (recoupment)
a payer recovering a prior overpayment.
Targeted Probe and Educate (TPE)
the MAC's provider-specific, issue-specific program: a small probe sample followed by one-on-one education, repeated for a defined number of rounds, with referral to CMS if the error rate persists.
Taxonomy code
the code identifying a provider's specialty, which payers use to apply specialty-specific rules including the new/established and initial/subsequent tests.
Team surgery (modifier 66)
several physicians of different specialties, with support personnel, working as a team on a highly complex procedure.
Technical component (modifier TC)
the equipment, supplies, personnel, and overhead. Billed by whoever owns them, which is determined by ownership rather than by location.
Telehealth place of service
place of service 02 (telehealth other than in the patient's home) and 10 (telehealth in the patient's home) on the professional claim, reported in combination with modifier 95 or not according to each payer's current published policy.
Temporary code
a code established quickly by CMS or another payer where no permanent code exists; may later become permanent, be replaced by a CPT code, or persist indefinitely.
Testing accommodations
adjustments to testing conditions for candidates with documented disabilities, requested through an organization's published process; requires documentation and review time, so the process is begun before scheduling.
The component question
the per-code determination of whether a service is reported globally, as a professional component, or as a technical component, decided by who owned the equipment and who produced the signed interpretation rather than by what happened clinically. (Ch.35; the four arrangements are Ch. 19 §19.1)
The distribution test
comparing a department's facility level distribution against its own case mix and its peers; a question rather than a finding, answerable only from the written criteria and the scored records, and never answered by lowering levels.
The obstetric episode log
the per-patient record opened at the first prenatal visit that carries the antepartum visit count kept contemporaneously, the eligibility re-verification dates, and every service furnished outside the package.
The reading habit
one primary source a month, twenty minutes, read at the source rather than in a summary: the Official Guidelines, a section of the NCCI Policy Manual, a coverage determination, a payer policy, one Federal Register rule a year. It compounds not because you memorize the changes but because you become one of very few people in any building who has read the primary document.
The specialty intake
the five questions answered in writing before coding in an unfamiliar specialty: what is the source document, what is bundled into what, what is the unit of payment, which policies govern the top services, and which twenty codes are the volume and which twenty are the dollars.
The three Rs
request, render, report; the three documented requirements of a consultation.
Third-party administrator (TPA)
an entity, frequently an insurance company, that administers a self-funded plan without bearing claims risk.
Three-day payment window
the rule bundling hospital outpatient services furnished within three days before an inpatient admission into the inpatient claim, in defined circumstances. One day for certain excluded facilities. It reaches wholly owned or operated entities.
Three-year rule
the lookback period distinguishing new from established patients, measured to the day rather than by calendar year.
Time units
units derived from continuous anesthesia time, which begins when the anesthesiologist begins preparing the patient for induction and ends when the patient may be safely placed under postoperative supervision. The increment and rounding rule are payer-specific.
Time-based units
units of service derived from documented time, under one of four distinct conventions (E/M total time on the date, the eight-minute rule for timed therapy, psychotherapy's typical durations, and anesthesia's continuous clock), each requiring both a duration and a record of what occurred in it.
Timed code
a therapy code reported in units of time, commonly 15 minutes, requiring constant attendance or direct one-on-one contact.
Timely filing
the contractual or statutory deadline, running from the date of service, by which a claim must be submitted.
Timely filing for appeals
the deadline discipline applied to the appeal itself: every level has a filing window, and every window runs from the date of the determination being appealed.
Total time on the date of the encounter
the time personally spent by the reporting physician or QHP on that patient on that calendar date, face-to-face and non-face-to-face. Excludes clinical staff time, other dates, separately reported services, and travel.
Toxic effect
the effect of a nonmedicinal substance. The toxic effect code is sequenced first, then the manifestation.
Transfer DRG rule
the payment rule under which a hospital transferring a patient (rather than discharging them), with a stay at least one day below the GMLOS, is paid a per diem — the full DRG payment divided by the GMLOS, doubled for the first day — capped at the full DRG amount; extended to post-acute settings for an annually defined DRG list.
Transfer of care
the handing over of responsibility for management of a problem. Not a consultation; the receiving professional reports an ordinary E/M service.
Transfer rule
the policy under which a hospital that transfers rather than discharges a patient may be paid a per diem rather than the full DRG, for defined DRGs when the stay is shorter than the geometric mean length of stay.
Transitional care management (TCM)
99495 and 99496, covering the 30-day period beginning on the date of discharge to a community setting: interactive contact within two business days, a face-to-face visit within 14 or 7 calendar days, and medication reconciliation; the face-to-face visit is part of the service.
Treatment management (radiation oncology)
the professional management component of a radiation course, reported per a defined number of fractions rather than per visit or per week.
Treatment, payment, and health care operations (TPO)
the purposes for which PHI may generally be used and disclosed without individual authorization. Coding and billing are payment.
TRICARE
the health program for uniformed service members, retirees, and their families, regionally administered with its own plan options, authorization rules, and allowable charge methodology.
Trumping
the operation by which the highest-ranked category a member's diagnoses reach is retained and every lower category in the same family is set to zero for that year. It protects the payer against double-counting; it does not protect the record against under-description.
Two-midnight benchmark
CMS's benchmark under which care expected to span at least two midnights generally supports inpatient admission. Judged on the physician's documented expectation at the time of the decision, not on the actual length of stay.
Two-of-three rule
the requirement that two of the three MDM elements meet or exceed a level for the encounter to reach that level. The lowest element does not cap the level.
Two-step rule
Alphabetic Index first, Tabular List second, without exception. The index finds the code; the Tabular carries every instruction that governs it, none of which is visible from the index.
Two-times rule
the structural guardrail on APC grouping: within an ambulatory payment classification, the highest-cost significant item may not cost more than twice the lowest, with defined exceptions CMS must justify — the reason APC families are stratified into levels.
Type 1 NPI
an individual provider's identifier, following the person through their career.
Type 2 NPI
an organization's identifier. Not interchangeable with a Type 1.
Type of bill
the code on a facility claim identifying facility type, bill classification, and frequency (original, replacement, void).
U
UB-04
the standard claim form for institutional services, also designated the CMS-1450. Its electronic equivalent is the 837I.
Unapplied cash
money received and banked but never matched to an account; sits in suspense while the accounts it belongs to generate statements and follow-up. The damage is not the cash; it is everything the system believes while the cash sits.
Unbundling
reporting component parts of a service separately when a comprehensive code describes it or when edits prohibit separate reporting.
Uncertain behavior
a pathological conclusion that a specimen could not be classified as benign or malignant. A documented finding, not the coder's uncertainty.
Uncertain diagnosis rule
outpatient: do not code diagnoses documented as probable, suspected, questionable, rule out, or working; code the documented signs, symptoms, or reason for the visit instead. Inpatient: code such a diagnosis documented at the time of discharge as if it existed.
Unclassified drug code
a code meaning "a drug for which no specific code exists." Carries no information, so the claim must supply the drug name, dose, and route in the narrative and generally the NDC. Prices manually.
Underdosing
taking less of a drug than prescribed or instructed.
Underpayment
a payment lower than the contract requires. It does not deny, does not reject, appears on no exception report, and raises the net collection rate.
Unified Program Integrity Contractor (UPIC)
the benefit-integrity contractor covering Medicare and Medicaid: fraud, waste, and abuse rather than billing error, with authority to conduct prepayment and postpayment review, make site visits, recommend payment suspension, and refer to law enforcement.
Uniform Hospital Discharge Data Set (UHDDS)
the federal definitional standard for inpatient reporting, including the principal diagnosis and reportable additional diagnoses.
Unique test
a test identified by a distinct CPT code. A panel is one unique test regardless of the number of analytes.
Units of service
the whole-number quantity reported on a claim line. Fractions of a unit cannot be reported.
Unlisted procedure
a code for a service the code set does not describe, used only when nothing else fits including any applicable Category III code. Requires a special report and carries no assigned relative value.
Unspecified behavior
the documentation does not state the behavior of the neoplasm.
Upcoding
reporting a code reflecting a more expensive service than the documentation supports.
Use additional code
an instruction appearing on an etiology code, requiring an additional code sequenced second.
Usual, customary, and reasonable (UCR)
an older methodology setting an allowed amount by reference to prevailing charges in a geographic area; still encountered in out-of-network and liability contexts.
V
Vaccine administration pairing
the discipline of reporting the vaccine product and its administration together (90686 with 90471, plus 90472 for each additional administration), including the correct exception where the product was supplied by a public program and only the administration may be billed. (Ch.35; the two-code rule is Ch. 19 §19.10)
Value code
a circumstance code reporting an amount, including counts such as covered days.
Value-based contract
any agreement that ties payment to measured cost, quality, or both rather than to volume alone.
Views
the number of images obtained in a plain radiographic study; frequently determines the code.
Visit complexity add-on (G2211)
a HCPCS Level II add-on code describing the visit complexity inherent to serving as the continuing focal point for a patient's health care, or to ongoing care related to a single serious or complex condition. It pays for the continuing relationship rather than for the individual encounter.
Void
a resubmission that withdraws a prior claim entirely: item 22 code 8, or frequency digit 8. Used when the claim should not exist at all.
W
Wage index
the labor-market adjustment applied to the base rate's labor-related share.
Waived test
a test determined to be simple, with a low risk of erroneous results, performable under a Certificate of Waiver. The list is published and changes.
With contrast
contrast material administered intravascularly, intra-articularly, or intrathecally. Oral or rectal contrast alone is coded without contrast.
Work queue
the list of items awaiting action. A good queue contains only actionable items, in an order reflecting urgency, with visible aging and a defined exit for each item.
Work RVU
the component measuring the physician's own time, technical skill, physical and mental effort, judgment, and stress. Frequently used as a productivity measure independent of claim payment.
Workers' compensation
state-regulated coverage for work-related injury and illness, primary over health insurance for covered injuries, governed by state-specific fee schedules, forms, and rules.
Working DRG
the Medicare Severity Diagnosis-Related Group a record would group to as it stands mid-stay, on incomplete documentation; a review and prioritization tool, never a bill, and reconciled against the final coded DRG at discharge.
Write-off
a decision to stop pursuing money the practice was entitled to collect. Somebody decides it, unlike a contractual adjustment.
X
X12
the standards development organization whose specifications HIPAA adopted for health care transactions. Its implementation guides are published and sold, not free.
X{EPSU} modifiers
XE (separate encounter), XS (separate structure), XP (separate practitioner), XU (unusual non-overlapping service); more specific alternatives to modifier 59 that state the reason for the distinction.
Z
Z-code
a chapter 21 code for an encounter whose reason is not a disease, or for a circumstance affecting the patient's care. May be first-listed or secondary depending on which.
Zero-pay line
a line that paid nothing. It still carries a group code, a CARC, and a remark code, and skipping it discards the only record of the decision.