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CARC
CO-146
CARC
CO — Contractual Obligation
Coding/Modifier
Quick Facts
Code
CO-146
Type
CARC
Category
Coding/Modifier
Status
Active
Diagnosis was invalid for the date(s) of service reported
What Does This Code Mean?
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
Recommended Next Steps
- Check the ICD-10-CM code set effective for that specific date of service
- Correct and resubmit as a corrected claim
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Educational reference only — not medical or legal advice. Always confirm code usage and appeal rights with the specific payer.