Medical Billing Glossary

A claim that passes payer edits and is adjudicated on first submission without needing correction, extra information or resubmission. The clean claim rate measures the front end of the revenue cycle — registration, eligibility and coding — rather than how persistent the follow-up is.

A claim stopped before adjudication, usually at the clearinghouse, for a data or format problem. Because the payer never made a decision, a rejection never appears in denial reporting — yet the filing clock keeps running on it.

A claim the payer has adjudicated and refused to pay. Unlike a rejection, a denial has been through the payer's decision process, appears in denial reporting, and has a defined appeal route with its own deadline.

The payer's process of reviewing a submitted claim and deciding what to pay, reduce or refuse. A claim that has been adjudicated has received a decision; one stopped before adjudication was rejected and never reached that stage.

An intermediary that receives claims from a practice, checks them against format and payer rules, and routes them to the correct payer. Claims failing those checks are rejected at the clearinghouse and never reach the payer at all.

Checking a claim against payer-specific edits before submission — demographics, coverage, coding logic, modifiers, place of service and required fields — so the common causes of rejection are caught in-house rather than in transit.

A resubmission that fixes an error in an earlier claim. It is a different route from an appeal: a corrected claim is appropriate when the original contained a mistake, whereas an appeal challenges a decision the payer made correctly on the information given.

A formal challenge to a payer's denial, supported by the documentation that payer specifies. Appeal windows are typically counted from the remittance date rather than the date of service, and are often shorter than practices assume.

The deadline by which a payer requires a claim to be submitted. Limits vary widely between payers, and a claim that has been rejected twice may be far closer to its deadline than its date of service suggests.

An itemized record of the services provided at a visit with their associated codes. Practices use it internally to create a claim, and patients with out-of-network coverage often submit one to their insurer to claim reimbursement themselves.

Recording the services performed against the correct provider and fee schedule so a claim can be created. Every day between the date of service and charge entry is a day of delayed cash flow, and on short-window payers a day of risk.

The share of claims paid on first submission without rework. It is a more demanding measure than the denial rate because it also captures rejections and claims that needed correction before they were ever adjudicated.

The human-readable statement showing how a claim was processed: what was allowed, what was paid, what was adjusted and what the patient owes. Its machine-readable equivalent, used for automated posting, is the electronic remittance advice.

The electronic file a payer returns describing how claims were processed, carrying the adjustment and remark codes that make automated posting and denial routing possible. Collapsing those codes into a single write-off at posting destroys that information.

A standard code on a remittance explaining why a payment differs from the amount billed. Preserving these at posting is what allows denials to be grouped by root cause rather than counted as one undifferentiated total.

A supplementary code on a remittance that adds detail to an adjustment reason code, often explaining what documentation or action a payer expects next. Read together, the two codes usually indicate whether a claim is worth appealing.

The maximum a payer will recognize for a service under its contract with the practice. Payment, contractual adjustment and patient responsibility are all calculated from the allowed amount, not from the practice's billed charge.

The difference between the amount a practice charges and the amount its contract with a payer allows. It is written off as a matter of course and should not be confused with an adjustment write-off, which is a decision rather than an obligation.

A payment that falls short of the contracted rate for the service. Without a comparison against expected rates it posts identically to a correct payment, which makes it one of the most persistent and least visible sources of lost revenue.

Money on an account that exceeds what was owed, usually from an overpayment or duplicate payment. It is an obligation rather than a windfall, and leaving it unresolved distorts accounts receivable while the liability remains.

A payer recovering money it previously paid, commonly by offsetting the amount against future payments after a post-payment review. On a remittance it can appear as an unexplained reduction unless whoever posts it knows to look for it.

Payments received measured against what the practice was actually entitled to collect after contractual adjustments. It reflects revenue cycle performance, whereas the gross collection rate mostly reflects how the fee schedule is set.

Money a practice has billed and not yet collected. The total alone says little, because it mixes claims moving normally through adjudication with claims that have stalled and balances that will never be paid.

Outstanding balances grouped by how long they have been unpaid, conventionally in 30-day bands. It matters whether the report ages from the date of service or the date of billing, because the second hides any delay in getting claims out.

An estimate of how long a practice takes to collect, usually the current receivables balance divided by average daily charges. It is sensitive to charge volume, so a drop in volume raises it even when collection performance is unchanged.

The share of receivables outstanding beyond ninety days. It is the most useful single figure on an aging report, because new claims generally collect normally and a growing older balance usually means old claims are not being worked.

A scoped project to work an aged receivables backlog, run separately from ongoing follow-up so the two do not compete for the same capacity. The balance is triaged into what is collectable, what is correctable and what should be closed.

Removing a balance from accounts receivable. Contractual write-offs are the expected difference between charge and contracted rate; adjustment write-offs are decisions, and should always carry a documented reason so patterns stay visible.

A balance a practice has determined it will not collect, typically patient responsibility that has been pursued without success. Classifying it deliberately keeps the receivables figure honest rather than inflated by amounts nobody expects to receive.

A code describing a medical procedure or service performed. Together with a diagnosis code it tells the payer what was done and why, and the pairing is what establishes whether the service was medically necessary.

A diagnosis code describing the patient's condition. A correctly coded procedure is still refused if the linked diagnosis does not establish why the service was needed, which makes diagnosis linkage one of the most common denial causes.

A code set covering items and services outside the procedure codes, including supplies, drugs and certain equipment. Practices dispensing or administering products alongside clinical services generally bill them using these codes.

A two-character addition to a procedure code that describes a circumstance the base code does not — a distinct service, a bilateral procedure, an unusual situation. Applied by habit rather than by current payer policy, modifiers are a reliable source of denials.

National code-pair edits defining which procedure codes may be billed together. Claims conflicting with them are typically reduced or refused automatically, without anyone reviewing the clinical circumstances behind the pairing.

A limit on how many units of a service are considered plausible for one patient on one date. Claims above the limit are usually cut back or refused automatically, so unit calculation errors surface as reductions rather than as questions.

The code family covering patient visits, levelled by the complexity of medical decision making or by total time. Inconsistent levelling between providers in the same practice is the most common finding in a primary care coding review.

Billing a higher-level service than the documentation supports. It is avoided by coding from the note rather than from expectation, and by querying the provider when documentation is unclear instead of assuming the more favorable reading.

Billing below the level the documentation supports, usually out of caution. It produces no denials and no audit letters, so nothing signals it — which is why over a year it often costs a practice more than its denials do.

A payer's requirement that a service was reasonable and necessary for the patient's condition, evidenced by the documentation. It is established by the link between diagnosis and procedure, not by the procedure code alone.

Confirming that a patient has active coverage on the date of service. It catches inactive plans but not exhausted benefits or missing authorizations, which is why benefits verification is a separate and broader step.

Establishing what a patient's coverage actually pays for: deductible position, co-insurance, co-payment, visit or frequency limits and authorization requirements. It is what makes an accurate patient responsibility conversation possible at check-in.

A payer's advance approval for a service, without which the claim is typically refused. The common failure is not forgetting it entirely but failing to track how many authorized units remain as treatment progresses.

A requirement on some plans that a primary care physician direct the patient to a specialist before the visit is covered. It is distinct from prior authorization, and a plan can require one, both or neither.

The rules determining which payer is responsible first when a patient holds more than one policy. Claims sent to the wrong payer first are refused, and these disputes often sit unresolved because settling them needs the patient's input.

An arrangement where a plan routes a category of care to a separate carrier from the medical benefit, most commonly behavioral health. A clean claim sent to the medical plan is simply refused, because that payer was never responsible for it.

The amount a patient must pay before their plan begins paying. With high-deductible plans widespread, a growing share of practice revenue now depends on collecting from patients rather than from payers.

The percentage of the allowed amount a patient pays after the deductible is met. Because it is calculated from the allowed amount rather than the billed charge, estimates based on a practice's fee schedule are usually wrong.

The portion of the allowed amount left with the patient — deductible, co-payment and co-insurance combined. Calculated incorrectly, it generates statements for amounts the patient does not owe, which is expensive to unwind.

A code identifying where a service was delivered. It affects how a claim is priced and is a frequent point of failure in telehealth billing, where payer expectations have changed repeatedly and still differ between plans.

The management of every stage between a patient booking an appointment and the balance being resolved. It is broader than billing: it includes eligibility and authorization before the visit, denial root-cause analysis, accounts receivable strategy and reporting.

Medicare coverage delivered through a private plan rather than traditional Medicare. Authorization requirements, network rules, appeal routes and timeframes differ by plan, so a practice with a large advantage population is effectively billing several distinct payers.

A plan that administers benefits on behalf of a program such as Medicaid. Where a program is delivered through managed care, the responsible payer is the plan rather than the program, and identifying the right one belongs in verification.

An employer plan where the employer bears the cost of claims and an administrator processes them. These plans are governed federally rather than by state insurance law, so state prompt-pay and dispute provisions generally do not apply to them.

The distribution of a practice's revenue across its payers. It determines which rules dominate a practice's billing, which is why benchmark figures quoted without reference to payer mix are of limited use for any specific practice.

The list of amounts a practice charges, and separately the contracted amounts each payer has agreed to pay. Comparing the two is how underpayments are detected; without current contracted rates on file, a short payment cannot be distinguished from a correct one.

The process by which a payer verifies a provider's qualifications before allowing them into its network. It is a prerequisite for enrollment, and it typically takes long enough that starting it late delays a new provider's first paid claim.

Registering a provider with a payer so claims submitted under their identifier can be paid. A provider treating patients before enrollment completes generates claims that cannot be paid, and depending on payer rules those may not be recoverable retroactively.

The unique identifier assigned to a healthcare provider and used on claims. Mismatches between the identifier on a claim and the payer's enrollment record produce rejections that look mysterious until the enrollment is checked.