What Is CARC 29?

What CARC 29 Means

CARC code 29 indicates that the payer has rejected the claim because the time limit for filing has expired. Every payer sets a timely filing limit measured from the date of service or discharge — Medicare allows 12 months, most commercial plans require submission within 90 to 365 days, and Medicaid deadlines vary by state. When a claim arrives after that window closes, the payer assigns CARC 29 and denies payment entirely. The CO group code typically accompanies this denial, preventing you from billing the patient for the lost amount.

Why CARC 29 Matters

Timely filing denials are often the most frustrating because the clinical service was legitimate — the only issue is when the claim was submitted. A single CARC 29 denial can represent thousands of dollars on a hospital claim or hundreds on a professional fee. These denials spike after billing system migrations, payer ID changes, or COB delays where secondary claims sit in a work queue too long. Industry estimates suggest 3% to 5% of all claim denials involve timely filing, and many are appealable when the provider has proof of timely submission the payer failed to match.

How CARC 29 Affects Your Claim

CARC 29 results in a full denial with zero payment — not a partial adjustment. The payer will not reprocess the claim unless you successfully appeal or resubmit with evidence that the original submission was timely. Common triggers include the payer applying the wrong filing limit, failing to link a corrected resubmission to the original claim date, or rejecting a secondary claim because primary EOB processing pushed you past the secondary filing window. Some payers also issue CARC 29 when they cannot locate a prior submission you know was sent, creating a documentation dispute rather than a true late filing.

What to Do About CARC 29

Verify the payer's actual filing limit in your contract or provider manual — payers sometimes apply shorter limits than agreed. Pull clearinghouse submission logs, payer portal confirmations, or certified mail receipts proving timely submission. If a prior claim for the same patient was processed, cite it as evidence the payer had your provider information on file. Write an appeal letter attaching all proof with specific dates and reference numbers. For secondary claims delayed by primary processing, argue the filing clock should start from primary EOB receipt. Denial Appeal Pro generates timely filing appeals with the submission evidence structure payers require.

Frequently Asked Questions

What is the typical timely filing limit for commercial payers?

Most commercial payers require claims within 90 to 365 days from the date of service. Medicare allows 12 months, while Medicaid deadlines vary by state from 90 days to 24 months.

Can I appeal a CARC 29 timely filing denial?

Yes, if you can prove the claim was submitted within the filing window using clearinghouse timestamps, payer portal confirmation, or evidence of a prior paid claim that tolled the deadline.

Does CARC 29 mean I can bill the patient?

Usually not. CARC 29 typically appears with a CO group code, meaning the provider is contractually prohibited from billing the patient for the denied amount. The recovery path is an appeal or corrected resubmission.

What proof do I need for a timely filing appeal?

Clearinghouse acceptance reports with date stamps, electronic submission confirmations, certified mail receipts for paper claims, and records showing the payer previously processed related claims on the same patient.