Dentovio public answer
CO 29 denial code dental
On a dental remittance, code CO 29 means: The claim arrived after the filing deadline expired. depends: check the facts first. Winnable only with proof: an electronic acceptance report or certified-mail record showing timely original submission, a wrong-payer-first trail (COB confusion), or a state statutory floor the contract deadline violates. Without proof of timely filing, this denial usually stands — and the write-off cannot be billed to the patient under most participation agreements.
- Cluster
- Practice operations
- Last verified
- 2026-08-29
- Reviewer
- See source page
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Source citations
- X12-CARC X12 Claim Adjustment Reason Codes (official list) (x12.org)