SY HCPCS Level II modifier: Persons who are in close contact with member of high-risk population (use only with codes for immunization)
SY is a HCPCS Level II modifier: “Persons who are in close contact with member of high-risk population (use only with codes for immunization).” It adds this detail to the code it is reported with.
Official description
SYPersons who are in close contact with member of high-risk population (use only with codes for immunization)
Short description: Contact w/high-risk pop
HCPCS · United States
Medicare details
The indicators CMS publishes with SY in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Not payable by Medicare
- Added
- Jan 1, 2005
Where SY sits
- 1GroupHCPCS modifiers
- 2Modifier SYPersons who are in close contact with member 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 SY mean?
SY is the HCPCS code for “Persons who are in close contact with member of high-risk population (use only with codes for immunization)” in CMS’s HCPCS Level II October 2026 release.
Where is SY in the HCPCS Level II list?
SY is listed under Modifiers.
Does Medicare cover SY?
CMS lists SY’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 SY
All modifiersSQItem ordered by home healthSSHome infusion services provided in the infusion suite of the iv therapy providerSTRelated to trauma or injurySUProcedure performed in physician's office (to denote use of facility and equipment)SVPharmaceuticals delivered to patient's home but not utilizedSWServices provided by a certified diabetic educatorSZHabilitative servicesT1Left foot, second digitT2Left foot, third digitT3Left foot, fourth digitT4Left foot, fifth digitT5Right foot, great toe