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N188 Remark Code: Approved Level of Care Mismatch

N188 means the payer approved one level of care, but the procedure or service code on the claim reflects a different level. The authorization and the claim do not line up, so the payer cannot pay the line as billed.

Quick facts

Code
N188 (RARC N188)
Status
Active In use since February 28, 2003.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The line was denied or reduced because the billed level exceeds or differs from what was approved. Resolve with the payer; do not shift it to the patient.
  • OA (Other Adjustment): Some payers use OA while they wait for an updated authorization or corrected claim.
Official description
The approved level of care does not match the procedure code submitted.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N188 means

When a payer authorizes care, it often approves a particular level, not just the service in general. N188 says the procedure code you submitted belongs to a different level than the one approved. Examples include billing inpatient days when observation was approved, billing a higher-acuity behavioral health program than authorized, or billing a more intensive home health or rehab tier.

It often accompanies CARC 198 (authorization exceeded) or CARC 186 (level of care change).

Common causes

  • The patient’s condition changed and the level of care increased, but nobody requested an updated authorization.
  • The authorization was entered under a different code than the one charge capture produced.
  • The payer approved a lower level after review, and the claim still reflects what was requested.
  • Revenue or procedure codes were mapped incorrectly in the chargemaster for the approved service level.

How to fix it

  1. Pull the authorization letter or portal record and compare the approved level, codes, and dates with the claim.
  2. If the claim codes are wrong, correct them to reflect the care delivered and the approval, then submit a replacement claim with resubmission code 7 and the original claim number.
  3. If the care was truly at a higher level, contact utilization management about retroactively updating the authorization, with clinical documentation.
  4. If that is refused, file an appeal explaining why the higher level was medically necessary.

How to prevent it

Tie authorizations to specific codes in your scheduling or case management system and set alerts when a patient’s level changes. Case managers should notify the payer the same day a level change occurs. For more, see authorization and referral denials.

Codes that may appear with N188

  • CO-198 (Precertification/notification/authorization/pre-treatment exceeded.): The precertification or authorization was exceeded, a common companion when the billed level is higher than approved.
  • CO-186 (Level of care change adjustment.): A level of care change adjustment was applied.
  • CO-150 (Payer deems the information submitted does not support this level of service.): The information submitted does not support the level of service billed.
  • N54 (Claim information is inconsistent with pre-certified/authorized services.): Claim information is inconsistent with the pre-certified or authorized services in general.
  • N610 (Alert: Payment based on an appropriate level of care.): Alert that payment was based on an appropriate level of care.
  • CO-197 (Precertification/authorization/notification/pre-treatment absent.): No authorization at all, as opposed to one that approved a different level.

N188 FAQ

What is a level of care?

It is the intensity of service the payer approved, such as inpatient versus observation, acute versus subacute, or a specific tier of behavioral health or home care. Each maps to particular codes.

Can the authorization be updated after the fact?

Some payers allow a level-of-care change if requested promptly with clinical documentation. Others require the request during the stay or episode. Ask the utilization management department.

Should I just rebill at the approved level?

Only if the approved level accurately describes the care. If the higher level was clinically justified, pursue an authorization update or appeal instead.