UK HCPCS Level II modifier: Services provided on behalf of the client to someone other than the client (collateral relationship)
UK is a HCPCS Level II modifier: “Services provided on behalf of the client to someone other than the client (collateral relationship).” It adds this detail to the code it is reported with.
Official description
UKServices provided on behalf of the client to someone other than the client (collateral relationship)
Short description: Svc on behalf client-collat
HCPCS · United States
Medicare details
The indicators CMS publishes with UK in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Not payable by Medicare
- Added
- Apr 1, 2003
Where UK sits
- 1GroupHCPCS modifiers
- 2Modifier UKServices provided on behalf of the client to someone other than the client (collateral relationship)
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 UK mean?
UK is the HCPCS code for “Services provided on behalf of the client to someone other than the client (collateral relationship)” in CMS’s HCPCS Level II October 2026 release.
Where is UK in the HCPCS Level II list?
UK is listed under Modifiers.
Does Medicare cover UK?
CMS lists UK’s Medicare coverage as “Not payable by Medicare”. 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 UK
All modifiersUDMedicaid level of care 13, as defined by each stateUEUsed durable medical equipmentUFServices provided in the morningUGServices provided in the afternoonUHServices provided in the eveningUJServices provided at nightUNTwo patients servedUPThree patients servedUQFour patients servedURFive patients servedUSSix or more patients servedV1Demonstration modifier 1