UN HCPCS Level II modifier: Two patients served
UN is a HCPCS Level II modifier: “Two patients served.” It adds this detail to the code it is reported with.
Official description
UNTwo patients served
HCPCS · United States
Notes for UN
As CMS prints them, with any note UN takes from the headings above it.
Note
- CMS processing note 0114: FOR MEDICARE PURPOSES, MODIFIERS UN-US WOULD BE REPORTED WITH R0075.
Medicare details
The indicators CMS publishes with UN in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Carrier judgment
- Added
- Jan 1, 2004
Where UN sits
- 1GroupHCPCS modifiers
- 2Modifier UNTwo patients served
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 UN mean?
UN is the HCPCS code for “Two patients served” in CMS’s HCPCS Level II October 2026 release.
Where is UN in the HCPCS Level II list?
UN is listed under Modifiers.
Does Medicare cover UN?
CMS lists UN’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 UN
All modifiersUEUsed durable medical equipmentUFServices provided in the morningUGServices provided in the afternoonUHServices provided in the eveningUJServices provided at nightUKServices provided on behalf of the client to someone other than the client (collateral relationship)UPThree patients servedUQFour patients servedURFive patients servedUSSix or more patients servedV1Demonstration modifier 1V2Demonstration modifier 2