What is Claim appeal?
A formal request that a payer reverse a denial, supported by documentation and filed within the payer’s appeal window.
Definition
An appeal asks the payer to reconsider a denial it has already made. Payers run tiered processes — reconsideration, then formal appeal, sometimes external review — each with its own deadline, usually shorter than the original filing window.
Appeal economics are strongly favourable and widely underexploited: a meaningful share of denied claims are never appealed at all, while a substantial share of those that are appealed get overturned. Medical-necessity denials with strong clinical documentation are the best-returning category; timely-filing denials without proof of submission are the worst.
Why it matters
The appeal window is shorter than the filing window and starts running the moment the remittance arrives. Denials that sit unworked for weeks are frequently already unappealable.
Denial codes to know
Related terms
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