CO-29 — Filed past the timely-filing limit
Claim-adjustment reason code 29 · typically reported as CO-29
What it means
The claim arrived after the payer’s filing deadline (12 months from DOS for Medicare; often 90–180 days commercial).
Why DME claims hit it
- Claims parked on hold for missing docs until the window closed
- Rebills after a long eligibility/COB fight without proof of original timely submission
How to fix it
- Pull proof of timely original filing (clearinghouse acceptance reports) and resubmit with it
- If truly late, check the payer’s exception criteria (e.g., retro eligibility) before writing off
Appeal posture
Appeal ONLY with documentation fitting an exception — otherwise it’s a write-off and a process fix.
Related denial codes
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