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.
Seeing denial code 111 on your EOB?
A denial code tells you what the payer reported, but it may not tell the whole story. Reviewing your EOB and bill together can help clarify what may need attention.
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
- What Is an Itemized Medical Bill? How to Request One
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.
Seeing this code on your own EOB?
Upload the EOB, the bill, or both — MD Bill Check reads the codes on your documents, compares them side by side, and flags what's worth questioning. Free, no account needed.