XS HCPCS Level II modifier: Separate structure, a service that is distinct because it was performed on a separate organ/structure
XS is a HCPCS Level II modifier: “Separate structure, a service that is distinct because it was performed on a separate organ/structure.” It adds this detail to the code it is reported with.
Official description
XSSeparate structure, a service that is distinct because it was performed on a separate organ/structure
Short description: Separate organ/structure
HCPCS · United States
Medicare details
The indicators CMS publishes with XS in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Carrier judgment
- Added
- Jan 1, 2015
Where XS sits
- 1GroupHCPCS modifiers
- 2Modifier XSSeparate structure, a service that is distinct because it was performed on a separate organ/structure
Source and release
- Data release
- HCPCS Level II · October 2026
- Effective date
- Oct 1, 2026
- Publisher
- CMS
This page is built from the HCPCS Level II catalog that Vero Codes reads when it suggests codes: Centers for Medicare & Medicaid Services’s October 2026 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does HCPCS code XS mean?
XS is the HCPCS code for “Separate structure, a service that is distinct because it was performed on a separate organ/structure” in CMS’s HCPCS Level II October 2026 release.
Where is XS in the HCPCS Level II list?
XS is listed under Modifiers.
Does Medicare cover XS?
CMS lists XS’s Medicare coverage as “Carrier judgment”. Coverage and payment still depend on the patient, the setting, the documentation and the payer.
Which HCPCS Level II release does this page use?
It uses CMS’s October 2026 release, in effect from Oct 1, 2026 to Dec 31, 2026. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside XS
All modifiersX2Continuous/focused services: for reporting services by clinicians whose expertise is needed for the ongoing management of a chronic disease or a condition that needs to be…X3Episodic/broad services: for reporting services by clinicians who have broad responsibility for the comprehensive needs of the patient that is limited to a defined period and…X4Episodic/focused services: for reporting services by clinicians who provide focused care on particular types of treatment limited to a defined period and circumstance; the…X5Diagnostic services requested by another clinician: for reporting services by a clinician who furnishes care to the patient only as requested by another clinician or subsequent…XESeparate encounter, a service that is distinct because it occurred during a separate encounterXPSeparate practitioner, a service that is distinct because it was performed by a different practitionerXUUnusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main serviceZANovartis/sandozZBPfizer/hospiraZCMerck/samsung bioepis