Healthcare Error Code
Healthcare Insurance / Medical Billing
Common CMS / Medicare Issues
M263 | Coding error
Industry
Healthcare
Canonical
/healthcare/error-codes/m263/
Last Updated
Feb 25, 2026
Summary
This code indicates that an error was identified in coding information.
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What This Code Means
M263 is used when CMS identifies incorrect or invalid coding on the claim. Coding accuracy is required for adjudication. This is an administrative issue rather than a coverage determination. Corrected coding may allow reprocessing.
Where Users Usually See This Code
- Medicare remittance advice
- Coding validation reports
- Claim rejection notices
Why This Code Appears
- Incorrect diagnosis or procedure codes
- Coding does not meet CMS rules
- Submission errors
What Typically Happens Next
- Claim is denied or adjusted
- Reprocessing may be required
- Payment is delayed
What This Code Is Not
- It is not a non-covered service decision
- It is not patient responsibility
- It is not a contractual adjustment
Troubleshooting Checklist
- □ Review coding guidelines
- □ Confirm code accuracy
- □ Monitor CMS updates
Notes And Edge Cases
Coding rules are updated regularly. System edits may flag previously accepted codes.
Related Codes
8 links
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