CO-29: Timely filing limit expired
UPDATED JULY 2026 · U.S. PLANS · NOT LEGAL OR MEDICAL ADVICE
The provider submitted the claim after the payer's filing deadline. In-network, this is generally the provider's problem — network contracts usually bar billing the member for late-filed claims.
CO-29 at a glance
- Code group: CO — Contractual Obligation — in-network providers generally cannot bill you for CO adjustments.
- Who usually fixes it: The provider’s billing office.
- Worth appealing? Sometimes — depends on the facts.
What to do about a CO-29 denial
- Don't pay a bill for a CO-29 denial before asking questions — ask the provider's office why the claim was late.
- In-network: point out that timely-filing write-offs are typically the provider's responsibility under their contract.
- The office can appeal with proof of original timely submission if the claim was actually sent on time.
Denied? Don’t drop it
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