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CARC 29 · CO-29

CARC 29 Denial: The time limit for filing has expired — How to Fix and Appeal

Reviewed by QuickIntell RCM Editorial Team · Last reviewed

Updated

TL;DR

CARC 29 (X12 The time limit for filing has expired). CARC 29 means the claim was submitted after the payer's timely-filing window closed.

Official X12 description

“The time limit for filing has expired.”

Source: X12 Claim Adjustment Reason Codes. The X12 External Code Lists are the single authoritative source for every CARC descriptor — always verify against the current release before building a claim-scrub rule.

What CARC 29 actually means

CARC 29 means the claim was submitted after the payer's timely-filing window closed. Every payer sets its own window (commonly 90 days to 1 year from the date of service), and most are unforgiving once the window passes. The only effective remedies are (a) proof the claim was actually submitted on time and the payer lost it, (b) a documented good-cause exception permitted by the payer's policy, or (c) retroactive eligibility cases where filing could not have occurred sooner.

Common root causes

  • Claim sat in a work queue (eligibility hold, coding review, clearinghouse reject) until the window closed.
  • Patient's coverage changed retroactively and the claim was not rebilled within the new primary's window.
  • Clearinghouse rejection was worked as a payer denial and the clock kept running.
  • Paper claim was mailed but not received (or received at the wrong address).

Prevention checklist

  • Aging workqueues sorted by timely-filing risk — surface claims approaching 75% of the payer's window first.
  • Document clearinghouse acknowledgments (277CA accepted status) as proof of original timely submission.
  • For every payer, encode the timely-filing days in the payer master and alert billers when a claim is within 14 days of the limit.

Appeal strategy — step by step

Most CARC 29 denials clear faster with the right remediation than with a formal appeal. Work the steps in order and escalate only when a lower-effort path has been ruled out.

  1. 1Submit proof of timely original submission: clearinghouse acknowledgment report, 277CA accepted segment with the original submit date, fax receipt, or certified-mail tracking.
  2. 2If the delay was due to retroactive Medicaid / COBRA eligibility, include the eligibility effective date and the CMS or state-plan retroactive-billing policy citation.
  3. 3If good-cause applies (natural disaster, patient-provided wrong coverage at visit), cite the payer's good-cause exception language and attach documentation.
  4. 4Assume denied appeals are final unless your contract with the payer explicitly overrides the timely-filing clause.
Sample appeal-letter language for CARC 29
[Provider letterhead] Re: Appeal of CARC 29 — Claim #{claim_number} Member: {member_name} · Member ID: {member_id} Date(s) of Service: {dos} On {remittance_date} this claim was adjusted with CARC 29: "The time limit for filing has expired." We respectfully request reconsideration. The X12 External Code List definition of CARC 29 does not apply to this claim for the following reasons: 1. [Cite the clinical / coding / policy fact that rebuts the adjustment] 2. [Cite the supporting documentation attached — op note, EOB, LCD/NCD citation, NCCI edit indicator, modifier rationale] 3. [Cite the payer's own policy where applicable] Attached: {list supporting documents} Please process payment under the member's benefits. If additional information is required, contact the billing office at {provider_phone} or {provider_email}. Sincerely, {billing_manager_name}, {credentials}

Edit the bracketed fields before sending. This template is a starting point; a payer-specific appeal form may still be required — check the provider portal first.

Payer-specific notes

Payer-specific behavior for CARC 29 publishes here as the QuickIntell anonymized denial ETL ingests sufficient volume. In the meantime, consult the payer directory for the relevant provider manual and appeal form.

How common is CARC 29?

Search demand rank
#20

Out of 306 seeded CARCs, ranked by combined US monthly search volume for "CARC 29", "CO-29 denial", and "denial code 29".

Platform frequency
Pending ETL

Platform frequency ranks publish once the anonymized denial-rate pipeline reaches the publication threshold (strategy §12 Phase 2).

How QuickRCM prevents CARC 29

QuickRCM catches the root causes above before the 837 leaves the clearinghouse:

  • Claim-scrub rules fire on every root cause listed above — the scrub references the same X12 CAS segment logic that drives the denial, so what the payer checks, QuickRCM checks first.
  • When a denial lands, QuickRCM routes it to the correct worker with the documentation bundle already attached (op note, LCD citation, modifier rationale, EOB, primary 835).
  • Appeal templates tuned to each CARC (including this one) pull the supporting facts from the claim and fill the bracketed fields automatically.
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Frequently asked questions — CARC 29

What does CARC 29 mean?

CARC 29 is an X12 Claim Adjustment Reason Code. The official definition is: "The time limit for filing has expired." In plain English, the payer is telling you cARC 29 means the claim was submitted after the payer's timely-filing window closed. Every payer sets its own window (commonly 90 days to 1 year from the date of service), and most are unforgiving once the window passes. The only effective remedies are (a) proof the claim was actually submitted on time and the payer lost it, (b) a documented good-cause exception permitted by the payer's policy, or (c) retroactive eligibility cases where filing could not have occurred sooner.

How do I resolve a CARC 29 (CO-29) denial?

Start with the most common root cause: Claim sat in a work queue (eligibility hold, coding review, clearinghouse reject) until the window closed. First step: Submit proof of timely original submission: clearinghouse acknowledgment report, 277CA accepted segment with the original submit date, fax receipt, or certified-mail tracking. See the full remediation and appeal checklist on this page before filing a formal appeal.

Is CARC 29 patient responsibility?

No — CARC 29 is typically carried under CO (Contractual Obligation) or OA (Other Adjustment), which means it is the provider's responsibility, not the patient's. Do not bill the patient unless the 835 CAS group code is PR.

What does CARC 29 look like on an EOB or 835 remittance?

On the 835 ERA, CARC 29 appears in Loop 2110 CAS segment as "CAS*CO*29*{amount}". On a paper EOB the same code prints in the Adjustment/Denial Reason column with the X12 description: "The time limit for filing has expired." — usually paired with one or more RARC remark codes in the same remittance line for additional context.

Which RARC is paired with CARC 29?

CARC 29 is commonly observed with RARC N30, MA130. The RARC narrows the reason — for example, pointing at a missing modifier, an LCD citation, or a specific policy. Fix the underlying CARC first; the RARC usually clears with the corrected claim.

Disclaimer

This page is operational reference for medical-billing professionals. It is not legal, clinical, or contractual advice. X12 code descriptors are maintained by the X12 External Code Lists; always verify against the current X12 release and the payer's own published policy before submitting or appealing a claim.