Claim Denied: Past Timely Filing Limits (CO-29) — Appeal Guide
Learn how to overturn health insurance claim denials citing 'timely filing limit exceeded' (CARC CO-29). Discover EDI clearinghouse batch logs and equitable tolling rules.
- CARC CO-29 indicates the original claim was not received by the payer within their contractual timely filing limit (typically 90, 180, or 365 days).
- If the provider submitted the claim electronically on time, electronic clearinghouse 999 or 277 acknowledgement reports prove timely filing.
- If an in-network provider failed to submit on time, contractual rules prohibit them from balance billing the patient.
Why Did This Denial Happen & What It Means
Carrier Rejection Rationale
Clearinghouse rejections, incorrect payer IDs, or unread mailroom correspondence frequently cause claims to miss arbitrary filing deadlines.
- Claiming no electronic record exists despite clearinghouse acceptance receipts
What This Means For You
The insurer refuses payment because the claim was submitted after the contractual deadline expired.
Evidence Checklist: Documents You Need to Overturn
Appeals backed by objective documentary evidence have a dramatically higher overturn rate. Assemble these items:
Irrefutable electronic proof of timely receipt.
Proof of physical mail receipt.
Step-by-Step Appeal Playbook
Obtain Electronic Clearinghouse Transmission Logs
Ask the provider billing office for the 277CA Claim Acknowledgement report showing the payer accepted the initial submission.
Assert Provider Contractual Write-Off if In-Network
If the in-network doctor submitted late, inform them in writing that provider agreements require an administrative write-off without patient billing.
Insurers are bound by federal administrative regulations. Citing these specific statutory rules in your appeal prevents arbitrary denials:
Clearinghouse confirmation timestamps constitute legal proof of timely delivery.
Appeal a Timely Filing Denial
ClaimAppeal AI generates formal timely filing appeals backed by electronic clearinghouse submission proof.
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Frequently Asked Questions
Can a doctor bill me if they missed the timely filing deadline?
If the provider is in-network, their contract with the insurance company strictly forbids balance billing the patient for their own late filing failure.
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