Denial Code 183 (CO-183, PR-183) — Meaning & What to Do
Claim Adjustment Reason Code (CARC)
What denial code 183 means: The referring provider isn't eligible to refer this service.
What to do about denial code 183: Ask the provider's billing office to explain or correct this, and resubmit if needed.
CO-183 vs PR-183 vs OA-183: what the prefix means
| Code on your EOB | What the prefix means | Who typically pays |
|---|---|---|
| CO-183 | Contractual obligation — the provider writes the amount off | Usually not the patient |
| PR-183 | Patient responsibility | The patient |
| OA-183 | Other adjustment | Often another payer or plan |
The prefix tells you who is expected to absorb the amount; the number (183) tells you why.
Seeing denial code 183 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 182The procedure modifier was invalid on the date of service.
CARC 185The rendering provider isn't eligible to perform this service.
CARC 181The procedure code was invalid on the date of service.
CARC 186A level-of-care change adjustment was applied.
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 183
What does denial code 183 mean on my EOB?
The referring provider isn't eligible to refer this service.
What should I do about denial code 183?
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.