M51
Missing/incomplete/invalid procedure code(s)
What This Code Means
The claim is missing a procedure code, or the code submitted is incomplete or invalid for the date of service.
Common Causes
- CPT/HCPCS code retired or not yet effective on service date
- Typo in procedure code field
- Code missing required digits
How to Resolve or Appeal
- Verify the procedure code is active and correctly formatted for the date of service
- Correct and resubmit as a corrected claim
Educational reference only — not medical or legal advice. Always confirm code usage and appeal rights with the specific payer.