CARC 29: The time limit for filing has expired.
The provider didn't submit the claim within the carrier's deadline (typically 90-180 days from date of service). Timely-filing denials usually become provider write-offs.
CARC 29 appears on the 835 ERA (Electronic Remittance Advice) that the payer returns after claim adjudication. It explains a reduction, denial, or payment adjustment to your billing team. For your practice, the question is workflow: identify the pattern, route the denial to the right resolution path (rebill, appeal, write-off), and recover what's recoverable without burning RVU time on dead-end fights.
What CARC 29 means
The official X12 description is: “The time limit for filing has expired.”
In plain language: The provider didn't submit the claim within the carrier's deadline (typically 90-180 days from date of service). Timely-filing denials usually become provider write-offs.
Common scenarios
- Provider billing department fell behind
- Coverage didn't process until after submission window
- Disputed payer identity at time of service
Practice workflow for CARC X 29
This is usually the PROVIDER'S responsibility, not yours — federal balance-billing protections may apply. Contact the provider's billing office and decline to pay until they appeal the timely-filing denial with the carrier. ERISA self-funded plans must give providers a reasonable cure window.
ApprovalHelp auto-drafts the appeal letter against the right federal appeal-rights regulation (ACA §2719, ERISA §503, NSA §2799A, 42 CFR 422 Subpart M, or 42 CFR 438 Subpart F) for the patient's plan type, the payer's own coverage policy, and the relevant clinical guideline. Drafts route to the clinician for signature in under five minutes.
CARC 29 group codes explained
On the 835 ERA, CARC 29 appears alongside a group code that signals who is financially responsible for the adjustment. CO (Contractual Obligation) — Contractual write-off. The provider agreed to the rate. Patient does NOT owe this amount.
Frequently asked questions
What does CARC 29 mean?
The time limit for filing has expired. In plain language: The provider didn't submit the claim within the carrier's deadline (typically 90-180 days from date of service). Timely-filing denials usually become provider write-offs.
Is CARC 29 appealable?
Yes — CARC 29 is one of the codes that commonly supports an appeal. This is usually the PROVIDER'S responsibility, not yours — federal balance-billing protections may apply. Contact the provider's billing office and decline to pay until they appeal the timely-filing denial with the carrier. ERISA self-funded plans must give providers a reasonable cure window.
Which group code does CARC 29 appear under?
CARC 29 most often appears under: CO (Contractual Obligation) — Contractual write-off. The provider agreed to the rate. Patient does NOT owe this amount.
When does CARC 29 typically appear on a denial?
Common scenarios: Provider billing department fell behind; Coverage didn't process until after submission window; Disputed payer identity at time of service.
What's the practice workflow for a CARC 29 denial?
This is usually the PROVIDER'S responsibility, not yours — federal balance-billing protections may apply. Contact the provider's billing office and decline to pay until they appeal the timely-filing denial with the carrier. ERISA self-funded plans must give providers a reasonable cure window.
Related resources
Sources
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