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CARC
CO-4
CARC
CO — Contractual Obligation
Coding/Modifier
Quick Facts
Code
CO-4
Type
CARC
Category
Coding/Modifier
Status
Active
Procedure code inconsistent with the modifier used
What Does This Code Mean?
The modifier attached to this procedure code doesn’t logically apply to that procedure per payer edits.
Common Causes
- Modifier appended that doesn't fit the procedure's code set rules
- Outdated or retired modifier used
Recommended Next Steps
- Confirm the modifier is valid for this specific CPT/HCPCS code
- Remove or correct the modifier and resubmit
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Educational reference only — not medical or legal advice. Always confirm code usage and appeal rights with the specific payer.