Denial Code 8 (CO-8, PR-8) — Meaning & What to Do
Claim Adjustment Reason Code (CARC)
What denial code 8 means: The procedure code doesn't match the provider's specialty.
What to do about denial code 8: Ask the provider's billing office to explain or correct this, and resubmit if needed.
CO-8 vs PR-8 vs OA-8: what the prefix means
| Code on your EOB | What the prefix means | Who typically pays |
|---|---|---|
| CO-8 | Contractual obligation — the provider writes the amount off | Usually not the patient |
| PR-8 | Patient responsibility | The patient |
| OA-8 | Other adjustment | Often another payer or plan |
The prefix tells you who is expected to absorb the amount; the number (8) tells you why.
Related codes
CARC 7The procedure code doesn't match the patient's sex.
CARC 9The diagnosis doesn't match the patient's age.
CARC 6The procedure code doesn't match the patient's age.
CARC 11The diagnosis doesn't match the procedure that was billed.
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 8
What does denial code 8 mean on my EOB?
The procedure code doesn't match the provider's specialty.
What should I do about denial code 8?
Ask the provider's billing office to explain or correct this, and resubmit if needed.
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.