Modifier XU
Modifier XU Description and Billing Use
Plain-language description
NCCI-associated modifier for a service that does not overlap the usual components of the main service.
How modifier XU is used
XU is the NCCI-associated modifier for an unusual non-overlapping service that does not overlap the usual components of the primary service. Use it only when that non-overlap is clear in the record and the active PTP edit permits a modifier exception.
Modifier XU questions
What does the XU modifier mean?
XU identifies an unusual non-overlapping service that does not overlap the usual components of the primary service.
What documentation supports XU?
The record should independently support both services and clearly show why the secondary service did not overlap the usual components of the primary service.
Before reporting this modifier
- 1. Confirm the current official or licensed definition and payer acceptance.
- 2. Identify the exact claim circumstance the modifier communicates.
- 3. Make the code, setting, related services, and medical record consistent.
- 4. Check NCCI, global surgery, component, DME, ABN, or drug rules that apply.
- 5. Do not append a modifier only to force an edit override.
This is a workflow summary, not a licensed CPT definition or claim-specific coding instruction. Verify the code set and payer rule effective for the date of service.