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N175 Remark Code: Missing Review Organization Approval

N175 means the payer needed an approval from a review organization, such as a utilization review or peer review entity, and the claim did not include it. Without that approval on record, the service cannot be paid.

Quick facts

Code
N175 (RARC N175)
Status
Active In use since February 28, 2003; last modified February 29, 2008.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The service was denied or held because the required approval was not provided. This is the provider's issue to resolve, not an amount to bill the patient.
  • OA (Other Adjustment): Occasionally used when the payer suspends the line pending the approval. Treat it as a request to supply the review decision.
Official description
Missing review organization approval.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N175 means

Some plans require an outside or delegated body to approve a service before the plan will pay for it. That body might be a utilization management vendor, a peer review group, or a quality improvement organization. N175 tells you the claim reached adjudication with no evidence of that approval.

It typically explains CARC 197 (authorization absent) or CARC 16 (missing information). The difference between N175 and its sibling N241 is simple: N175 means nothing was on file or on the claim, while N241 means something was supplied but did not satisfy the payer.

Common causes

  • The approval was obtained, but the approval or reference number never made it onto the claim (box 23 on the CMS-1500, or the prior authorization field of the 837).
  • The service was approved by a different entity than the one the payer relies on for this benefit.
  • No review was requested because staff did not know the service needed one.
  • The approval exists under a different provider, facility, or date span, so the payer cannot link it to this claim.

How to fix it

  1. Check the payer or review organization portal for an approval matching the patient, service, and date of service.
  2. If you find one, add its reference number to the claim and submit a corrected claim with resubmission code 7 and the original claim number.
  3. If no approval exists, ask the review organization whether retrospective review is available and what records it needs.
  4. Once an approval is issued, resubmit or request reprocessing as the payer directs.
  5. If the service was urgent and the plan’s rules exempt it from review, appeal with documentation showing the exemption applies.

For broader prevention tactics, see authorization and referral denials.

How to prevent it

Keep a payer-by-payer list of services that route through a review organization, and add a scheduling check that confirms the approval number before the visit. Store the approval against the encounter so it flows onto the claim instead of relying on manual entry.

Codes that may appear with N175

  • CO-197 (Precertification/authorization/notification/pre-treatment absent.): Precertification or authorization was absent; N175 specifies that the missing approval was from a review organization.
  • CO-16 (Claim/service lacks information or has submission/billing error(s).): The claim lacks information needed to adjudicate; N175 identifies the review approval as the missing item.
  • CO-252 (An attachment/other documentation is required to adjudicate this claim/service.): Documentation is required to adjudicate the claim, and the approval record is that documentation.
  • N241 (Incomplete/invalid review organization approval.): The companion code for an approval that was sent but is incomplete or invalid.
  • N10 (Adjustment based on the findings of a review organization/professional consult/manual adjudication/medical advisor/dental advisor/peer review.): Explains an adjustment based on a review organization's findings rather than a missing approval.
  • CO-216 (Based on the findings of a review organization or the payer's findings.): Reason code for adjustments based on the findings of a review organization or the payer.

N175 FAQ

What counts as a review organization?

It depends on the payer. It can be a utilization review vendor, a quality improvement organization, or another entity the plan delegates medical review to. The plan documents or provider manual will name it.

Is N175 the same as a missing prior authorization?

They overlap. N175 is specific to approvals from a review organization. If the plan uses a delegated vendor for approvals, N175 may be how it signals the vendor's approval is absent.

Can I get the approval after the service?

Some review organizations allow retrospective review, and some do not. Ask the payer or the review entity whether a retro request is possible before resubmitting.