Denial Code 29 (CO-29, PR-29) — Meaning & What to Do
Claim Adjustment Reason Code (CARC)
What denial code 29 means: The claim was submitted too late (past the filing deadline).
What to do about denial code 29: This is usually the provider's responsibility, not yours — you generally shouldn't be billed for a late-filing denial.
CO-29 vs PR-29 vs OA-29: what the prefix means
| Code on your EOB | What the prefix means | Who typically pays |
|---|---|---|
| CO-29 | Contractual obligation — the provider writes the amount off | Usually not the patient |
| PR-29 | Patient responsibility | The patient |
| OA-29 | Other adjustment | Often another payer or plan |
The prefix tells you who is expected to absorb the amount; the number (29) tells you why.
Related codes
CARC 27Coverage had ended when this service was provided.
CARC 45The charge was above the maximum allowed amount, and the excess was written off.
CARC 23Payment was affected by a prior payer's decision (coordination of benefits).
CARC 50The insurer decided this service was not medically necessary.
Keep reviewing your bill
- Medical Bill vs EOB: What Is the Difference?
- How to Dispute a Medical Bill — Find Billing Errors Before You Pay
Frequently asked questions about Denial code 29
What does denial code 29 mean on my EOB?
The claim was submitted too late (past the filing deadline).
What should I do about denial code 29?
This is usually the provider's responsibility, not yours — you generally shouldn't be billed for a late-filing denial.
Found this code on your bill or EOB?
Upload the document — MD Bill Check decodes every code, checks the math line by line, and explains what's worth questioning.