RARCN122ReferenceCurrentVerified Aug 15, 2026RARC N122
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
An add-on code cannot be billed by itself.
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 usage
- Coding denials for add-on codes billed without the primary procedure
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.