Remark Code M81 on Your EOB — Meaning & What to Do
Remittance Advice Remark Code (RARC)
What remark code M81 means: A required diagnosis code is missing.
What to do about remark code M81: Ask the provider's billing office to explain or correct this, and resubmit if needed.
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 M81.
Related codes
RARC M80This service can't be paid on the same day as a related service.
RARC M119The drug (NDC) code is missing, incomplete, or invalid.
RARC M79The charge amount is missing, incomplete, or invalid.
RARC M123The drug name, strength, or quantity information is missing.
Keep reviewing your bill
- Medical Bill vs EOB: What Is the Difference?
- How to Dispute a Medical Bill — Find Billing Errors Before You Pay
Frequently asked questions about Remark code M81
What does remark code M81 mean on my EOB?
A required diagnosis code is missing.
What should I do about remark code M81?
Ask the provider's billing office to explain or correct this, and resubmit if needed.
Found this code on your bill or EOB?
Upload the document — MD Bill Check decodes every code, checks the math line by line, and explains what's worth questioning.