CARC 29 Timely Filing Denial Appeal

Why CARC 29 Denials Happen

Timely filing denials occur when the payer has no record of receiving your claim within their filing deadline — or when their system shows a receipt date outside the allowed window. Common causes include clearinghouse routing errors, payer system outages, incorrect payer ID on the original submission, and claims stuck in payer suspense queues. The denial is administrative, not clinical, which means the right documentation can overturn it entirely.

Evidence That Wins Timely Filing Appeals

Your appeal hinges on proving when the claim was originally submitted, not when the payer processed it. Pull your clearinghouse acceptance report showing the 999 or 277CA acknowledgment with a timestamp inside the filing window. If you submitted via fax, attach the transmission log with date, time, and confirmation number. Portal submissions need screenshot or export of the submission confirmation with the payer reference number.

Writing Your Timely Filing Appeal Letter

State the claim number, date of service, payer filing deadline per your contract, and the date your records show the claim was originally submitted. Reference each attached proof document by name. Request reprocessing based on verified timely submission. Keep the letter factual — this is a records dispute, not a clinical argument.

When You Actually Filed Late

If the claim was genuinely filed after the deadline, check whether an exception applies: payer processing delays on a prior claim, coordination of benefits delays, or retroactive eligibility updates. Some payer contracts include grace provisions for specific scenarios. Document the extenuating circumstance and cite the contract section that supports an exception.