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N145 Remark Code (Deactivated): Provider ID for Location

N145 meant the provider identifier on the claim was missing, incomplete, or invalid for the place of service. X12 deactivated it without naming a replacement; service facility and rendering provider identifier remarks now cover these problems.

X12 deactivated RARCN145 on June 2, 2005. Payers should no longer use it on new remittances, but it can still appear on older ERAs, corrected claims, and appeals.

Code: N145 (RARC N145)
Status: Deactivated StoppedJune 2, 2005 (in use since October 31, 2002).
Code set: Remittance Advice Remark Codes (RARC)
Group codes: CO (Contractual Obligation): Accompanied CO adjustments; the provider needed to use an identifier valid for that location.
Official description: Missing/incomplete/invalid provider identifier for this place of service.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified: September 24, 2026 against the official X12 list.

What N145 meant

Remark N145 said the provider identifier on the claim was not right for the place where the service was performed. Under older numbering systems, a provider might hold location-specific numbers, and using the wrong one for a given setting caused rejections.

What replaced it

X12 did not name a successor. The closest active remarks today focus on the specific field: N293 for the service facility identifier, N290 for the rendering provider identifier, and M77 when the place of service itself is wrong or inappropriate. The related deactivated remark MA105 carried much the same message.

If you still see N145

It only appears in older remittances. For a current location-related rejection, check the rendering provider’s enrollment for that practice location and the service facility details on the claim, then correct and resubmit.

N293 (Missing/incomplete/invalid service facility primary identifier.): Missing, incomplete, or invalid service facility primary identifier.
N290 (Missing/incomplete/invalid rendering provider primary identifier.): Missing, incomplete, or invalid rendering provider primary identifier.
M77 (Missing/incomplete/invalid/inappropriate place of service.): Missing, incomplete, invalid, or inappropriate place of service.

N145 FAQ

How is N145 related to MA105?

They carried nearly the same message about a provider number that did not fit the place of service. Both were retired around the time national provider identifiers were being introduced.

What is the modern equivalent problem?

A provider billing from a location not linked to its enrollment with the payer, or a service facility identifier that does not match where care was given.

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