What is Denial?
Also called: claim denial · denied claim
Denials split into hard and soft. A soft denial can be resolved without an appeal — additional information, corrected data, a resubmission. A hard denial requires a formal appeal, and once its deadline passes the revenue is gone.
The number worth internalizing: roughly 70% of appealed denials are ultimately overturned and paid. The obstacle to recovering denied revenue is almost never the merits of the claim. It is whether anyone has the capacity to work it before the clock runs out.
Where Vizora handles this
Primary sources
Where "Denial" is defined by the bodies that set the rules, rather than by us.
- Claim Adjustment Reason Codes (CARC) (opens in a new tab)
X12 — The authoritative, maintained CARC list. Our denial code lookup explains these in plain English; X12 is where the canonical definitions live.
- Remittance Advice Remark Codes (RARC) (opens in a new tab)
X12 — The remark codes that qualify a CARC on an ERA. Reading the RARC is usually what tells you whether a denial is appealable.
- Medicare claims appeals process (opens in a new tab)
Centers for Medicare & Medicaid Services — The five levels of appeal, what each requires and the deadline for each. Missing a level's deadline ends the appeal regardless of the claim's merits.
Last reviewed August 20, 2026
Related terms
Rejection
A rejection is a claim stopped before adjudication — by the clearinghouse or the payer's intake system — for a format, data or eligibility error. Because it never entered adjudication, it carries no appeal rights and does not appear in payer claim status. It must be corrected and resubmitted.
Appeal
An appeal is a formal request that a payer reconsider a denied claim, supported by documentation addressing the stated denial reason. Commercial payers typically allow 90 to 180 days from the remittance date; Medicare provides five escalating levels beginning with redetermination within 120 days.
CARC
A claim adjustment reason code explains why a payer adjusted or denied a payment. Maintained by X12, each CARC carries a group code — CO for contractual obligation, PR for patient responsibility, OA for other adjustment — which determines whether the balance may be billed to the patient.
Denial Rate
Denial rate is the percentage of submitted claims a payer denies, usually measured on first submission. MGMA data puts single-specialty physician practices at roughly 8%; Kodiak Solutions reports 11.81% for hospitals and health systems in 2024. Above 10% is where practices generally start losing material revenue.
Timely Filing
Timely filing is the deadline by which a payer must receive a claim. Limits commonly range from 90 days to one year from the date of service, vary by payer and contract, and are shorter for secondary claims. A claim denied for timely filing is generally unappealable and unbillable to the patient.
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