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N739 Remark Code: Missing Vein Study Report

N739 means the payer needed a vein study report, such as a venous duplex ultrasound interpretation, to process this claim and did not receive it. Vein treatment claims commonly require this study to show coverage criteria were met.

Quick facts

Code
N739 (RARC N739)
Status
Active In use since March 1, 2015.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The provider is responsible for the denied amount while the report is missing.
Official description
Missing Vein Study Report.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N739 means

N739 is the “nothing on file” version of the vein study remark. The claim was for a service, usually treatment of varicose veins or venous insufficiency, that the payer covers only with a supporting vein study. No report reached the reviewer, so the claim was denied, often with CARC 252 or CARC 50.

The study might have been done by your practice, an outside imaging center, or a vascular lab. What matters to the payer is the interpreted report.

Common causes

  • The payer’s policy requires the report at claim time, but the practice sent it only with the authorization request.
  • The study was performed elsewhere and never added to your record.
  • Records were sent without claim identifiers and were not matched.
  • The procedure was billed before the study report was finalized.

How to fix it

  1. Locate the signed vein study report for the leg and veins treated.
  2. Confirm the study date and findings satisfy the payer’s policy.
  3. Submit it through the payer’s documentation channel with the claim number, member ID, and date of service.
  4. Ask whether reprocessing is automatic or needs a reconsideration request.
  5. If no study was done, speak with the treating physician; the procedure may not be payable under the payer’s rules.

How to prevent it

For vein procedures, keep the study report, prior authorization, and any conservative therapy documentation together so they travel with the claim. The authorization and referral guide covers building that packet before the procedure.

Codes that may appear with N739

  • CO-252 (An attachment/other documentation is required to adjudicate this claim/service.): Documentation is required to adjudicate; here it is the vein study.
  • CO-50 (These are non-covered services because this is not deemed a 'medical necessity' by the payer.): Without the study, the payer did not find medical necessity established.
  • CO-197 (Precertification/authorization/notification/pre-treatment absent.): Sometimes seen when the missing study also meant the required authorization was never obtained.
  • N738 (Incomplete/invalid Vein Study Report.): A vein study report was received but was incomplete or invalid.
  • M31 (Missing radiology report.): A missing radiology report, a broader imaging code.
  • N457 (Missing Diagnostic Report.): A missing diagnostic report of any kind.

N739 FAQ

Why would a payer need a vein study for treatment?

Many vein treatment policies base coverage on documented venous reflux or insufficiency. The study provides the objective findings that support treatment.

The study was done at another facility. What now?

Request the signed report from that facility and submit it. Payers do not usually obtain outside imaging on your behalf.

Will attaching the report to the prior authorization help?

It helps with the authorization, but the claim review may still require its own copy. Send it with the claim if the payer's policy asks for it.