Modifier XU- Unusual Non-Overlapping Service

Modifier XU is used to identify a service that does not overlap the usual components of the primary procedure.

What is Modifier XU?

Modifier XU tells insurance payers that a service was distinct because it did not overlap with the usual components of another service performed on the same day.

When to Use Modifier XU

• A distinct service is performed
• The service does not overlap with another procedure
• Documentation supports separate work
• Modifier 59 would otherwise be considered

Billing Example

A provider performs a diagnostic service that is separate from and does not overlap the usual components of another procedure performed during the same encounter. Modifier XU may be appended to indicate the service is distinct.

Documentation Tips

• Clearly explain why the service is separate
• Document non-overlapping work performed
• Support medical necessity
• Maintain detailed procedure notes

Common Denial Reasons

• Insufficient documentation
• Service considered bundled
• Incorrect modifier usage
• Lack of medical necessity

Related Modifiers

Modifier XE

Modifier XP

Modifier XS