Remark Code M123 on Your EOB — Meaning & What to Do
Remittance Advice Remark Code (RARC)
What remark code M123 means: The drug name, strength, or quantity information is missing.
What to do about remark code M123: 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 M123.
Related codes
RARC M119The drug (NDC) code is missing, incomplete, or invalid.
RARC MA01You have the right to appeal this Medicare decision.
RARC M81A required diagnosis code is missing.
RARC MA13You may be responsible for a portion under a specific program rule.
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 M123
What does remark code M123 mean on my EOB?
The drug name, strength, or quantity information is missing.
What should I do about remark code M123?
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.