Bundling / NCCI
Bundling is when a payer folds one service's payment into another's under NCCI edits (CARC 97); it's recoverable when the services were genuinely separate and the documentation supports a distinct-service modifier.
Bundling is when a payer pays for only one of two services performed together, folding the second into the first's allowance instead of paying it separately. The rulebook behind most of this is NCCI — the National Correct Coding Initiative — a set of edit pairs (from CMS, and adopted in various forms by commercial payers) that define which code combinations should be paid as one. When two codes hit an NCCI edit, the second is denied with CARC 97 ('included in the allowance for another service'). Bundling is recoverable when the two services were genuinely distinct — a separate site, a separate session, a separate problem. The recovery hinges on the distinct-service modifier: modifier 59, or the more specific X{EPSU} modifiers, tells the payer the services were separate, and the documentation has to actually support that claim. A bundling denial sticks when the modifier is missing, wrong, or unsupported by the note; it gets overturned when the appeal proves distinctness. Some NCCI edits also have a modifier indicator of '0,' meaning they can't be unbundled at all — so part of working these denials is knowing which pairs are separable and which aren't, before spending effort on an appeal that can't win.
Volari reads bundling denials against the modifiers and documentation on the claim, filing the distinct-service appeal only where the note supports it — recovering genuinely separate services folded into one payment.
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