OA-236: Incompatible Procedure/Modifier Combination

What Does OA-236 Mean?

OA-236 is used when the incompatible procedure determination involves workers compensation scenarios or complex multi-service situations where the adjustment does not strictly fall under a single contractual obligation.

CARC 236 fires when the payer identifies an incompatible procedure or procedure/modifier combination on the same date of service. This is driven by the National Correct Coding Initiative (NCCI) edits or state-specific workers compensation fee schedule requirements. Unlike CARC 231 (mutually exclusive), which focuses on procedures that cannot logically coexist, CARC 236 specifically targets code combinations that conflict — including modifier combinations that create invalid pairings.

The most common trigger is billing two procedure codes together that NCCI classifies as a column 1/column 2 pair where the column 2 code is denied because it is considered part of the column 1 procedure. This also applies when a modifier attached to one procedure creates an invalid combination with another procedure on the same claim. In workers compensation settings, state-specific fee schedules may define additional incompatible combinations beyond what NCCI covers.

This code typically appears with CO (contractual obligation), meaning the provider absorbs the cost and cannot bill the patient. The service that is considered incompatible is denied while the primary procedure is usually paid. Resolution often involves applying the appropriate NCCI-allowed modifier if the services were performed as genuinely separate procedures.

How to Resolve

Identify the specific incompatible code pair, review NCCI edits or workers comp rules, apply the appropriate modifier for distinct services, and resubmit.

1. Review applicable regulations Check state workers compensation fee schedule requirements for the specific procedure combinations and determine the applicable rules for your jurisdiction.
2. Contact the payer Reach out to the workers compensation payer or claims adjuster for clarification on the incompatible combination and available resolution options.

Common RARC Pairings

The RARC code tells you exactly what triggered the OA-236:

How to Prevent OA-236

• Maintain current knowledge of state workers compensation fee schedule rules for procedure compatibility
• Verify procedure compatibility before billing workers compensation claims

Also Filed As

The same CARC 236 may appear with different Group Codes:

Related Denial Codes