Remittance advice remark code
Remark code M77 meaning
RARC M77: The place of service is missing, incomplete, invalid or does not fit the service.
Run it in Rivvi
Check the codes behind a denial
Upload a claims export. Rivvi flags ICD-10 and HCPCS codes that are not billable, replaced, or unspecified when a specific code exists.
Check my exportFree to start. Opens Rivvi, the AI workspace for healthcare teams.
- Remark code
- RARC M77
- Short name
- Place of service missing or wrong
- Plain meaning
- The place of service is missing, incomplete, invalid or does not fit the service.
- Kind
- Adds detail to the reason code on the same line.
Plain-English summary written by Rivvi. X12 owns the RARC list and its exact wording, which is not reproduced here. Read it on the X12 RARC list (list dated July 1, 2026, checked October 23, 2026). This page does not decide how a claim is paid.
What to check before resubmitting
- Compare the place of service code to the CMS list and where the service happened.
Reason codes it often comes with
Related remark codes
Related pages
Questions
What does remark code M77 mean?
The place of service is missing, incomplete, invalid or does not fit the service. This is Rivvi's plain-English summary of RARC M77. X12's exact wording is on x12.org.
What should I do about M77?
Compare the place of service code to the CMS list and where the service happened.
Is M77 a denial?
A remark code adds detail to the reason code on the same line. The reason code (CARC) and its group code decide what was denied or adjusted. It is often paired with reason codes 16, 5, 58.
What is the difference between a RARC and a CARC?
A remittance advice remark code (RARC) adds detail to a claim adjustment reason code (CARC). The CARC says why the line was adjusted. The RARC often says what to fix.