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N290 Remark Code: Missing Rendering Provider NPI

N290 means the rendering provider's primary identifier, their individual NPI, was missing, incomplete, or invalid. It usually appears with CARC 16, and the fix is to verify and correct the rendering NPI, then resubmit.

Code: N290 (RARC N290)
Status: Active In use since December 2, 2004.
Code set: Remittance Advice Remark Codes (RARC)
Group codes: CO (Contractual Obligation): The line or claim was denied for a correctable identifier error. Do not bill the patient; correct the NPI and resubmit.
Official description: Missing/incomplete/invalid rendering provider primary identifier.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified: September 24, 2026 against the official X12 list.

What N290 means

When a group bills a service, the payer needs to know which individual clinician performed it. That is the rendering provider, identified by a Type 1 NPI in box 24J (or in the rendering provider section of the 837P). N290 means the payer couldn’t use the NPI that was there, or didn’t find one.

Paired with CARC 16, it reads simply as “missing rendering provider NPI.” Payers may also pair it with CARC 206, 207, or 208 to describe the kind of NPI failure.

Common causes

A new clinician started seeing patients before their NPI was loaded into the billing system.
The group NPI was entered in 24J.
The NPI belongs to a different clinician than the one who performed the service, often after schedule swaps.
A transposed digit failed the check-digit test.
The clinician’s NPI isn’t linked to the group’s enrollment with this payer, so the payer treats it as invalid for the claim.

How to fix it

Confirm from the documentation who performed the service on each denied line.
Verify the clinician’s individual NPI in NPPES.
Confirm the clinician is enrolled and linked to your group with this payer. See NPI, TIN, and network denials for what that check involves.
Correct box 24J (and the 837P rendering fields) on the affected lines.
Resubmit a corrected claim with frequency code 7 and the original claim number.

How to prevent it

Don’t schedule a new clinician for a payer until their NPI is loaded and enrollment is confirmed.
Validate NPI check digits and entity type automatically.
Compare the rendering clinician on the encounter with the billed rendering NPI before claims go out; Claims Validator can flag blank or malformed rendering NPIs.

Codes that may appear with N290

CO-16 (Claim/service lacks information or has submission/billing error(s).): The usual pairing: missing or invalid information, specified by N290 as the rendering NPI.
CO-206 (National Provider Identifier - missing.): The NPI was missing altogether.
CO-207 (National Provider identifier - Invalid format): The NPI failed format or check-digit validation.
CO-208 (National Provider Identifier - Not matched.): The NPI did not match the payer's records.
CO-185 (The rendering provider is not eligible to perform the service billed.): The rendering provider was identified but is not eligible to perform the service.

N289 (Missing/incomplete/invalid rendering provider name.): The rendering provider's name is the problem.
N291 (Missing/incomplete/invalid rendering provider secondary identifier.): The rendering provider's secondary identifier is the problem.
N257 (Missing/incomplete/invalid billing provider/supplier primary identifier.): The billing provider's NPI is the problem.
N286 (Missing/incomplete/invalid referring provider primary identifier.): The referring provider's NPI is the problem.

N290 FAQ

Where does the rendering NPI go?

In the unshaded area of box 24J on each service line of the CMS-1500. On electronic claims it is reported at the claim level or on the specific line when the rendering clinician differs.

Does a solo provider need a rendering NPI?

If you bill under your own individual NPI in box 33a, many payers don't need a separate rendering NPI. Groups billing under a Type 2 NPI almost always do.

Can I use the group NPI in 24J?

No. Box 24J is for the individual clinician who performed the service. A group or organization NPI there is a common cause of N290.

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