Remittance advice remark code

Remark code MA120 meaning

RARC MA120: The CLIA certification number is missing, incomplete or invalid.

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Remark code: RARC MA120
Short name: CLIA number missing or invalid
Plain meaning: The CLIA certification number is missing, incomplete or invalid.
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

Add the lab's 10-character CLIA number to the claim.
Check the certificate covers the test billed.

Reason codes it often comes with

Questions

What does remark code MA120 mean?

The CLIA certification number is missing, incomplete or invalid. This is Rivvi's plain-English summary of RARC MA120. X12's exact wording is on x12.org.

What should I do about MA120?

Add the lab's 10-character CLIA number to the claim. Check the certificate covers the test billed.

Is MA120 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, B7, B23.

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.