CO-182
Procedure modifier was invalid on the date of service
What This Code Means
The modifier attached to the procedure code wasn’t valid as of the date of service.
Common Causes
- Modifier retired or replaced in an annual update
- Modifier doesn't apply to this specific code
How to Resolve or Appeal
- Confirm modifier validity for the code and date of service
- Correct and resubmit
Educational reference only — not medical or legal advice. Always confirm code usage and appeal rights with the specific payer.