CARC199ReferenceCurrentVerified Aug 15, 2026CARC 199
AR Guide Workflow
Coding & Modifiers
The payer identified a coding issue — a mismatched or missing modifier, an inconsistent diagnosis, a revenue-code mismatch, or an unbundled service.
AR Guide explanation
What it means
The revenue code and procedure code do not match.
AR Guide knowledge
Common denial category
Coding & Modifiers — The payer identified a coding issue — a mismatched or missing modifier, an inconsistent diagnosis, a revenue-code mismatch, or an unbundled service.
AR Guide knowledge
Common causes
- Revenue code/CPT mismatch on institutional claims
- Billing system mapping error
AR Guide knowledge
What AR should verify
- Compare the revenue code to the procedure code
- Check the correct revenue code mapping for the service
AR Guide knowledge
Recommended action
- Correct the mismatch and resubmit
About this guidance: Note
AR Guide knowledge is general reference content written by our team — it is not payer-specific policy and never replaces the payer’s documentation or your contract. Always confirm specifics with the payer.