OA-231: Mutually Exclusive Procedures

What Does OA-231 Mean?

With OA, the mutually exclusive edit was applied during coordination of benefits.

CARC 231 indicates that two or more procedures billed on the same claim are classified as mutually exclusive per the National Correct Coding Initiative (NCCI) or the payer's own coding edits. Mutually exclusive procedures are those that, by definition, cannot reasonably be performed at the same session on the same patient — such as two different approaches to the same anatomical site or two procedures that represent alternative methods for the same clinical objective.

The payer will typically pay the higher-valued procedure and deny the mutually exclusive one. This differs from bundling (where one procedure is a component of another) — mutually exclusive means the two procedures represent contradictory approaches.

Common Causes

How to Resolve

1. Check NCCI edits Verify the edit and modifier override status.
2. Resubmit if correctable Apply modifiers and resubmit.

How to Prevent OA-231

• Apply NCCI edit checks before submitting to any payer

General Prevention

• Apply NCCI edits before submitting claims to all payers

Also Filed As

The same CARC 231 may appear with different Group Codes:

Related Denial Codes