Remark Code MA27 on Your EOB — Meaning & What to Do
Remittance Advice Remark Code (RARC)
What remark code MA27 means: Your Medicare ID number is missing, incomplete, or invalid.
What to do about remark code MA27: Verify your Medicare number with the provider.
Remark codes add detail to a claim decision. They appear alongside the main adjustment codes on your Explanation of Benefits or remittance notice, giving the specific reason behind remark code MA27.
Seeing remark code MA27 on your EOB?
A denial code tells you what the payer reported, but it may not tell the whole story. Reviewing your EOB and bill together can help clarify what may need attention.
Related codes
RARC MA18This claim was also forwarded to your secondary insurer.
RARC MA130The claim has a missing or invalid field and can't be processed as is.
RARC MA15Your claim was split for processing.
RARC N425This is a statutorily excluded service (not covered by law).
Keep reviewing your bill
- Medical Bill vs EOB: What Is the Difference?
- How to Dispute a Medical Bill — Find Billing Errors Before You Pay
- What Is an Itemized Medical Bill? How to Request One
Frequently asked questions about Remark code MA27
What does remark code MA27 mean on my EOB?
Your Medicare ID number is missing, incomplete, or invalid.
What should I do about remark code MA27?
Verify your Medicare number with the provider.
Seeing this code on your own EOB?
Upload the EOB, the bill, or both — MD Bill Check reads the codes on your documents, compares them side by side, and flags what's worth questioning. Free, no account needed.