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CARC
CO-181
CARC
CO — Contractual Obligation
Coding/Modifier
Quick Facts
Code
CO-181
Type
CARC
Category
Coding/Modifier
Status
Active
Procedure code was invalid on the date of service
What Does This Code Mean?
The CPT/HCPCS code wasn’t a valid, active code as of the billed date of service.
Common Causes
- Code retired or replaced in the annual CPT/HCPCS update
- Code submitted before its effective date
Recommended Next Steps
- Confirm the code set valid for that specific date of service
- Correct and resubmit with the appropriate code
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Educational reference only — not medical or legal advice. Always confirm code usage and appeal rights with the specific payer.