SK HCPCS Level II modifier: Member of high risk population (use only with codes for immunization)
SK is a HCPCS Level II modifier: “Member of high risk population (use only with codes for immunization).” It adds this detail to the code it is reported with.
Official description
SKMember of high risk population (use only with codes for immunization)
Short description: High risk population
HCPCS · United States
Medicare details
The indicators CMS publishes with SK in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Not payable by Medicare
- Added
- Apr 1, 2002
Where SK sits
- 1GroupHCPCS modifiers
- 2Modifier SKMember of high risk population (use only with codes for immunization)
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 SK mean?
SK is the HCPCS code for “Member of high risk population (use only with codes for immunization)” in CMS’s HCPCS Level II October 2026 release.
Where is SK in the HCPCS Level II list?
SK is listed under Modifiers.
Does Medicare cover SK?
CMS lists SK’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 SK
All modifiersSDServices provided by registered nurse with specialized, highly technical home infusion trainingSEState and/or federally-funded programs/servicesSFSecond opinion ordered by a professional review organization (pro) per section 9401, p.l. 99-272 (100% reimbursement - no medicare deductible or coinsurance)SGAmbulatory surgical center (asc) facility serviceSHSecond concurrently administered infusion therapySJThird or more concurrently administered infusion therapySLState supplied vaccineSMSecond surgical opinionSNThird surgical opinionSQItem ordered by home healthSSHome infusion services provided in the infusion suite of the iv therapy providerSTRelated to trauma or injury