CO-146
Diagnosis was invalid for the date(s) of service reported
What This Code Means
The ICD-10 code submitted wasn’t a valid, billable code as of the date of service (codes update annually).
Common Causes
- ICD-10 code retired or changed in the annual update
- Code submitted was not yet effective on the date of service
How to Resolve or Appeal
- Check the ICD-10-CM code set effective for that specific 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.