The Denial Appeal Process
How a denied medical claim is worked from receipt to resolution — reading the denial, deciding whether to correct, appeal, or write off, and filing a timely, well-documented appeal.
Updated
The denial appeal process is the operational workflow a billing team follows after a payer denies a claim: understand why it was denied, decide the right response, and — when an appeal is warranted — build and file it within the payer's deadline. It is how a denial is turned from lost revenue back into recoverable revenue.
It begins when a denial arrives on the remittance and ends when the claim is paid, the appeal is exhausted, or the balance is deliberately written off. Because most denials trace to a preventable upstream cause, the process also feeds that cause back so the same denial is less likely to recur.
The process
Receive and log the denial
A denial arrives on the payer's electronic remittance advice (ERA), carrying standardized Claim Adjustment Reason Codes (CARC) and Remittance Advice Remark Codes (RARC) that state why the claim was not paid. Record the denial against the claim so it is worked, not lost.
Read the reason and find the root cause
Translate the reason and remark codes into the real cause — eligibility, a missing authorization, a coding or medical-necessity issue, a registration error, or timely filing. The cause determines whether the claim can be fixed, should be appealed, or is not worth pursuing.
Decide the path: correct, appeal, or write off
If the denial came from a fixable error, correct and resubmit the claim rather than appeal it. If the payer's decision is disputable, prepare an appeal. If neither is warranted, write the balance off deliberately and record the reason.
Gather the supporting documentation
Assemble what substantiates the claim — the medical record, the authorization, proof of timely filing, or the payer's own policy — matched to the specific denial reason. A well-evidenced appeal is far more persuasive than a bare resubmission.
Write and file the appeal within the deadline
Prepare the appeal in the payer's required format and to the correct appeal level (many payers have more than one), and submit it within the payer's stated appeal window. Missing that deadline usually forfeits the right to appeal, so the clock is tracked from the denial date.
Track and follow up
Record the appeal, monitor for the payer's response, and follow up if it stalls. Escalate to the next appeal level when the first is upheld and the denial is still disputable.
Resolve and prevent recurrence
Close the loop when the claim is paid, the appeal is exhausted, or the balance is written off — and feed the root cause back to the upstream step that caused it (registration, eligibility, or coding), so the same denial is prevented next time.
Commonly confused with
- Corrected claim resubmission: Fixing an error and resubmitting is not an appeal — an appeal disputes the payer's decision, while a corrected resubmission replaces a claim that simply had a fixable mistake.
- Reconsideration / redetermination: Some payers require an informal reconsideration (for Medicare, a redetermination) before a formal appeal; the names and number of levels vary by payer.
- Rejection: A rejected claim never reached adjudication, so it is corrected and resubmitted, not appealed — only an adjudicated denial is appealable.
Related Knowledge
- What Is Revenue Cycle Management (RCM)?
Where the denial appeal process fits in the wider revenue cycle.
- Medical Billing Services
The service that runs this process end to end for a practice.
- Denial rate
The KPI this process is measured against.
- Denial
The plain-language definition of a denial.