N290 remark code

Remittance advice remark code N290. Remark codes add detail to the reason code on the same claim line.

Rendering provider ID problem

Unofficial reference. This is our own plain-English explanation, not the official code text. Payer rules differ. Verify with the payer and the official X12 code list. AlphaPrefix is not affiliated with X12, CMS or any payer. Data last updated Nov 11, 2026.

What N290 means

The NPI or other primary identifier of the provider who performed the service is missing, incomplete or not on file.

N290 tells you the payer could not match the rendering provider to someone it knows. This is often an enrollment or linking problem, such as a new clinician not yet added to the group's contract with the payer.

It typically accompanies reason code 16 or a reason code about provider eligibility.

Common causes

• A new provider saw patients before being enrolled or linked to the group with the payer.
• The rendering NPI on the claim was mistyped or left blank where it differs from the billing NPI.
• The rendering provider's enrollment lapsed or was not revalidated.

What to do next

1. Confirm the rendering NPI on the claim matches the provider who performed the service.
2. Check that the provider is enrolled and linked to the billing group with the payer.
3. Finish or fix enrollment, then resubmit or ask the payer to reprocess.
4. Hold claims for new providers until enrollment is confirmed.

Related codes

• N257 (remark code) Billing provider ID problem
• N570 (remark code) Credentialing data problem
• N95 (remark code) Provider type cannot bill this service