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N54 Remark Code: Claim Doesn't Match Authorization

N54 means the information on the claim is inconsistent with the services that were pre-certified or authorized. An authorization exists, but something on the claim, such as the procedure, dates, units, provider, or setting, does not match what was approved.

Code: N54 (RARC N54)
Status: Active In use since January 1, 2000.
Code set: Remittance Advice Remark Codes (RARC)
Group codes: CO (Contractual Obligation): The provider is responsible for billing consistent with the authorization. The amount is generally not billable to the patient.
PR (Patient Responsibility): Occasionally assigned to the patient when the plan places authorization responsibility on the member, as with some out-of-network services.
Official description: Claim information is inconsistent with pre-certified/authorized services.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified: September 24, 2026 against the official X12 list.

What N54 means

N54 is different from a no-authorization denial. The payer found an approval on file, but the claim describes something other than what was approved. The mismatch might be clinical, such as a different or additional procedure, or administrative, such as dates outside the approved window or a different facility.

It is usually paired with CARC 284 (authorization does not apply to the billed services), CARC 198 (authorization exceeded), or CARC 16.

Common causes

The surgeon performed a more extensive procedure than the one authorized.
Services ran past the approved end date, or started before it.
More units or visits were billed than approved.
The service moved to a different site, such as from outpatient hospital to an ambulatory surgery center.
The authorization was obtained under a different rendering provider or facility NPI.
A coding error on the claim created a mismatch that did not exist clinically.

How to fix it

Put the authorization and claim side by side and list every difference.
If the claim was coded wrong, correct it and send a corrected claim with resubmission code 7.
If the care changed, ask the payer to update or add to the authorization, then ask for reprocessing.
If only part of the service is authorized, make sure the authorized portion is billed correctly so it can be paid.
Appeal with clinical documentation when an update is denied but the change was medically necessary.

How to prevent it

Have schedulers and clinicians see the exact authorized codes, units, dates, and location before the service. Build a pre-bill check that compares claim lines to the authorization record, and notify the payer promptly when care plans change. For more, read authorization and referral denials.

Codes that may appear with N54

CO-284 (Precertification/authorization/notification/pre-treatment number may be valid but does not apply to the billed services.): The authorization may be valid but does not apply to the billed services.
CO-198 (Precertification/notification/authorization/pre-treatment exceeded.): The services billed exceeded what was authorized.
CO-16 (Claim/service lacks information or has submission/billing error(s).): A billing error, such as a wrong code or date, created the mismatch.

N45 (Payment based on authorized amount.): Payment was limited to the authorized amount rather than denied.
N188 (The approved level of care does not match the procedure code submitted.): The approved level of care does not match the procedure code submitted.
N27 (Missing/incomplete/invalid treatment number.): The treatment or authorization number itself is missing or invalid.
CO-197 (Precertification/authorization/notification/pre-treatment absent.): No authorization was found at all.

N54 FAQ

What details on the claim must match the authorization?

Typically the procedure codes, number of units or visits, date range, rendering or facility provider, place of service, and sometimes the diagnosis. Payers differ on how strictly each element is matched.

What if the provider did a different procedure than authorized?

Many payers let you request an authorization update within a short window after the service. If the update is approved, send a corrected claim or ask for reprocessing.

Can I just change the claim to match the authorization?

Only if the claim was wrong. The claim must reflect what was actually performed and documented, even if that means seeking a revised authorization.

Important: read before using this information

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