Remittance advice remark code
Remark code MA18 meaning
RARC MA18: The claim was also forwarded to the patient's supplemental insurer, such as a Medigap plan, through a crossover.
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- Remark code
- RARC MA18
- Short name
- Sent on to the supplemental insurer
- Plain meaning
- The claim was also forwarded to the patient's supplemental insurer, such as a Medigap plan, through a crossover.
- Kind
- Alert. Information only, not a denial by itself.
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
- Do not send a separate claim to that secondary payer unless it does not arrive.
- Wait for the secondary payer's remittance.
Reason codes it often comes with
Related remark codes
Related pages
Questions
What does remark code MA18 mean?
The claim was also forwarded to the patient's supplemental insurer, such as a Medigap plan, through a crossover. This is Rivvi's plain-English summary of RARC MA18. X12's exact wording is on x12.org.
What should I do about MA18?
Do not send a separate claim to that secondary payer unless it does not arrive. Wait for the secondary payer's remittance.
Is MA18 a denial?
MA18 is an informational remark (an alert). It does not deny the claim by itself. It is often paired with reason code 2.
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.