Denial Code Decoder
Look up a claim denial code (CARC) or remittance remark code (RARC) and get a plain-language meaning plus a guided, step-by-step path to the right action — fix and resubmit, appeal, or write off.
20 of 20 codes
- CO-45COCharge exceeds the contracted rateDecode
- CO-16COClaim lacks required informationDecode
- CO-18CODuplicate claimDecode
- CO-22COAnother payer is primaryDecode
- CO-29COFiled after the timely filing limitDecode
- CO-50CONot deemed medically necessaryDecode
- CO-97COBundled into another paid serviceDecode
- CO-109COWrong payer for this serviceDecode
- CO-167CODiagnosis not coveredDecode
- PR-1PRApplied to the deductibleDecode
- PR-3PRCopay amountDecode
- PR-204PRService not covered by the planDecode
- MA130RARCClaim returned as unprocessableDecode
- N265RARCOrdering or referring provider problemDecode
- N290RARCRendering provider identifier problemDecode
- MA27RARCMember entitlement number problemDecode
- M51RARCProcedure code missing or invalidDecode
- N56RARCWrong procedure code for the service billedDecode
- N179RARCPayer asked the member for informationDecode
- N522RARCDuplicate of an already-processed claimDecode
How it works
From code to action in under a minute
Every code page explains what the payer is saying in plain language, shows where in the revenue cycle the denial was born, and walks you through the questions a working biller would ask — ending at the action: correct and resubmit, appeal with the right evidence, or write off and fix the leak upstream.
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