CARC236ReferenceCurrentVerified Aug 15, 2026CARC 236
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
This procedure or procedure/modifier combination is not compatible with another procedure or modifier combination provided on the same day.
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
- Mutually exclusive procedures billed same day
- Unbundled services
- Modifier combination conflict
AR Guide knowledge
What AR should verify
- Review all procedures billed for the same date
- Check the NCCI/mutually exclusive edits
AR Guide knowledge
Recommended action
- Correct the coding combination and resubmit
- If services were distinct, appeal with documentation and appropriate modifiers
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.