CO-29Contractual ObligationTimely Filing
CO-29 Denial Code: Timely filing limit expired
The time limit for filing this claim has expired per the payer's timely filing rules.
Why CO-29 happens
- ●Claim submitted after the payer's filing deadline (often 90–365 days)
- ●Rejected claim never corrected and resubmitted in time
- ●Wrong payer billed first, burning the filing window
How to fix a CO-29 denial
- 1
Pull proof of timely filing (clearinghouse acceptance reports, EDI logs)
- 2
Appeal with proof of original timely submission
- 3
If truly late with no proof, evaluate write-off; do not bill the patient for CO-29
How to prevent it
Track payer-specific filing limits and work rejections within days, not weeks.
Drowning in CO-29 denials?
OakClaim works every denial within 48 hours and builds prevention rules so they stop recurring.