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M29 Remark Code: Operative Report Missing

M29 means the payer needed the operative note or report to process the claim, and it was not received. The surgical line cannot be paid until the report is supplied.

Quick facts

Code
M29 (RARC M29)
Status
Active In use since January 1, 1997; last modified July 1, 2008.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The line is unpaid pending documentation. The patient is not billed for missing records.
Official description
Missing operative note/report.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What M29 means

Some surgical claims cannot be decided from codes alone. The payer wants to read what the surgeon actually did, how long it took, and why. M29 says the operative note was required and not received, either because it was never sent or because the attachment did not link to the claim.

It is a documentation remark that usually rides with CARC 16, 252, or 226, depending on whether the payer asked for records first.

Common causes

  • An unlisted procedure code was billed without the operative report.
  • Modifier 22 was used without a report showing the extra work.
  • The payer sent a records request that went unanswered.
  • The attachment was sent without the claim number or attachment control number.
  • The report was unsigned or still in draft.

How to fix it

  1. Obtain the final, signed operative report from the surgeon or facility.
  2. Send it through the payer’s attachment process with the claim number referenced.
  3. If the payer requires a corrected claim, submit it with resubmission code 7 and indicate that documentation is attached.
  4. Highlight the key details in a short cover letter when the report supports a modifier or unlisted code.

How to prevent it

Tag claims with unlisted codes, modifier 22, or co-surgery modifiers so they cannot be sent without the report attached. Checking documentation requirements before submission with the Claims Validator keeps these from pending. See the CO-16 guide for more.

Codes that may appear with M29

  • CO-16 (Claim/service lacks information or has submission/billing error(s).): Information needed for adjudication is missing.
  • CO-252 (An attachment/other documentation is required to adjudicate this claim/service.): An attachment or documentation is required to adjudicate the claim.
  • CO-226 (Information requested from the Billing/Rendering Provider was not provided or not provided timely or was insufficient/incomplete.): Information requested from the provider was not provided or was insufficient.
  • N233 (Incomplete/invalid operative note/report.): The operative report was received but is incomplete or invalid.
  • M30 (Missing pathology report.): The pathology report is missing, rather than the operative report.
  • M127 (Missing patient medical record for this service.): The patient medical record in general is missing.

M29 FAQ

When do payers ask for operative reports?

Common triggers include unlisted procedures, modifier 22 for increased procedural services, co-surgery or assistant surgeon claims, and procedures under medical review.

Does the report need a signature?

Yes. Payers generally expect a signed, dated operative report that identifies the surgeon and procedure performed.

Should I resubmit the whole claim?

Follow the payer's instructions. Some accept the report as an attachment to the existing claim; others want a corrected claim with the report attached.