Denial Code Decoder
N265 — Ordering or referring provider problem
The ordering or referring provider on the claim is missing, misidentified, or not recognized by the payer — often because that provider is not enrolled with the payer, or the NPI on the claim does not match the enrollment record.
Billable to the patient? No — a provider-identifier defect is a provider-side fix.
Where this denial is born
- Front desk
- Coding
- Claim build
- Submission
- Adjudication
This denial is usually created at the highlighted stage — that is where prevention lives.
Answer the questions — follow the path
The same questions an experienced biller asks, in order. Your answers draw the route to the right action.
Is the provider's NPI correct and actively enrolled with this payer?
Check the NPI registry and the payer's enrollment status.
The full decision tree
Is the provider's NPI correct and actively enrolled with this payer?
Check the NPI registry and the payer's enrollment status.
- Yes →
Correct the identifier and resubmit. Fix the NPI or name mismatch on the claim and resubmit as a replacement.
- No →
Resolve the enrollment first. The provider needs to be enrolled (or their record corrected) with the payer before the claim can pay — route to credentialing, then resubmit.
Prevention
Validate ordering and referring provider NPIs against the payer's enrollment records at order entry, not at claim submission.
Related reading
The code list, and when it was last checked
X12 maintains the Remittance Advice Remark Codes list, where this code is listed as N265. A remark code carries no adjustment group of its own — the group you see on the remittance line belongs to the reason code it arrived with. It has been on the list since December 2, 2004.
Checked against the list revision dated July 1, 2026 on August 7, 2026, where it reads as an active code.
Sources
The paragraphs behind the guidance above. A page that tells you what to do about money should show you what the instruction rests on.
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