CO-183 — Referring provider not eligible to refer
Claim-adjustment reason code 183 · typically reported as CO-183
What it means
The referring physician on the claim fails the payer’s referral-eligibility check (enrollment/credential type).
Why DME claims hit it
- Referring physician not enrolled in Medicare (PECOS) or opted out
- Wrong NPI type (organizational instead of individual)
How to fix it
- Verify the physician’s PECOS enrollment before accepting the order; correct the NPI (individual, Type 1) and resubmit
Appeal posture
No — fix the provider data or obtain an order from an enrolled physician.
Related denial codes
CO-184 — Ordering provider not eligible to order/prescribeCO-206 — NPI missingCO-16 — Claim lacks information or has a submission error
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