Denial Code 111 (CO-111, PR-111) — Meaning & What to Do
Claim Adjustment Reason Code (CARC)
What denial code 111 means: This provider isn't certified or eligible to be paid for this service.
What to do about denial code 111: Ask the provider's billing office to explain or correct this, and resubmit if needed.
CO-111 vs PR-111 vs OA-111: what the prefix means
| Code on your EOB | What the prefix means | Who typically pays |
|---|---|---|
| CO-111 | Contractual obligation — the provider writes the amount off | Usually not the patient |
| PR-111 | Patient responsibility | The patient |
| OA-111 | Other adjustment | Often another payer or plan |
The prefix tells you who is expected to absorb the amount; the number (111) tells you why.
Related codes
CARC 110The billing date comes before the service date.
CARC 114This procedure or service isn't covered when done at home.
CARC 108Adjusted under a rental/purchase rule for equipment.
CARC 115The procedure was postponed, canceled, or delayed.
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 111
What does denial code 111 mean on my EOB?
This provider isn't certified or eligible to be paid for this service.
What should I do about denial code 111?
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.