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Filing, duplicates, authorization, and provider eligibility · Last verified 2026-08-30

CARC 29 denial code on dental claims

Independent publisher · Drafted with AI assistance, verified against primary sources · Credentialed review pending

CARC 29 is the “Filed after the deadline” code on a dental remittance. Whether it can be contested depends on the facts; run the checks below first.

Group code: X12 places no group-code restriction on 29. A group code always travels with a CARC, and it — not the CARC — assigns financial responsibility, so read the one on your remittance rather than assuming. Offices commonly write this one as CO 29; that is search shorthand, not a statement that the payer will use CO.

Registry entry: X12 Claim Adjustment Reason Code 29 — active, with no deactivation date. Read on the list published 2025-11-01.

Verdict

Depends — check the facts first

A valid contract term may control, while a factual error may be contested. Run the checks on this page before using the appeal window.

Potentially contestable with proof of timely original submission, a wrong-payer-first trail, or a state statutory floor the contract deadline violates. Be precise about what counts as proof: Texas Medicaid honours only an electronic claims report that its own system accepted or rejected, carrying the batch identification number, and certified-mail receipts for paper — a clearinghouse's own acceptance report is a step removed from that. Without such proof the filing decision is unlikely to change; check the participation agreement before assigning any balance to the patient.

The appealability verdicts on these pages are Dentovio's editorial classification. No standards body or payer publishes an appealability taxonomy: X12 defines what a code means, not what to do about it. Each verdict is built from the code's own mechanics and the payer and federal documents cited on the page, and it is a starting point for triage rather than a prediction of any outcome.

What it means in dental

The payer received the claim only after its filing window had closed.

Timely-filing denials turn on the governing deadline and submission proof. Dental payer agreements set their own windows, while some states impose minimum periods or coordination-of-benefits rules (North Carolina bars filing limits under 180 days; Florida providers get 6 months to reach the primary insurer). Medicaid windows are much shorter than the folklore: Texas Medicaid requires receipt within 95 days of each date of service — 365 days applies to out-of-state providers — inside a federal outer limit of 12 months from the date of service, with 120 days to appeal from the disposition date on the remittance report.

What to do

  1. 1.Pull the acceptance or rejection report the payer itself issued, with its batch identifier — not only the clearinghouse's own report
  2. 2.Check whether a primary/secondary COB mix-up consumed the window — many payers restart the clock from the primary EOB date
  3. 3.Check for a payer-side cause (wrong address on file, system outage); it is a documented basis for reconsideration at some payers
  4. 4.Compare the contract's filing limit against your state's statutory floor before conceding

Remark codes verified with this CARC

No source read for this page pairs a remark code with CARC 29. X12 defines no CARC-to-RARC pairings at all: payer crosswalks are specific to that payer's own internal reason codes, and the CAQH CORE combination list binds only payers operating inside its business scenarios. Read the remark code on your own remittance.

Appeal routes, by plan funding

Fully-insured route

State insurance law (prompt-pay statutes + plan appeal terms)

Check the state's prompt-pay rule first — an overdue clean claim may already be accruing interest without any appeal. Then run the policy's internal appeal, and escalate to the state insurance department where deadlines were missed.

Self-funded (ERISA) route

29 CFR 2560.503-1

Appeal in the patient's name (or with an authorized-representative form), demand the claim file and the specific internal rule relied on, and hold the plan to the 30/60-day clocks in writing. Before counting on a state remedy, read that state's own scope provision: several state prompt-pay and external-review statutes reach only insurers and HMOs by their terms, so they do not extend to a self-funded plan.

Medicaid managed care route

42 CFR 438.402 / 438.408

First classify the dispute. For an enrollee benefit denial, track two clocks in order: 60 days to the plan appeal, then (after the resolution notice) the state's 90–120-day fair-hearing window, with written consent before a provider acts for the enrollee. For a provider payment or contract dispute, use the provider contract and state Medicaid program process instead. For members under 21, federal EPSDT coverage rules also matter.

Read with this code

Sources

Last verified 2026-08-30. Dentovio is an independent publisher — not a payer, the ADA, X12, CAQH CORE, or any government agency. Code meanings and remark-code meanings on this page are Dentovio's own wording, written from the official X12 Claim Adjustment Reason Code and Remittance Advice Remark Code lists and linked back to them; X12 holds the copyright in those lists and its descriptions are not reproduced here. CDT codes are referenced by number only; CDT is the American Dental Association's copyrighted code set and this page does not reproduce ADA descriptors. Appealability verdicts are Dentovio editorial classification, not a standard. Every fact traces to the code steward's registry, a federal rule or manual, a HIPAA operating rule, an association publication, or a named payer's own document — never to a billing blog. This page was drafted with AI assistance and verified against the primary sources linked here. It has not been reviewed by a credentialed dental billing specialist, attorney, or clinician. Educational billing reference only — not billing, legal, or clinical advice. Plan contracts control individual outcomes, and processing policies usually live in the payer's provider manual rather than in the signed agreement. How this data is verified