S9988 HCPCS Level II code: Services provided as part of a phase i clinical trial
S9988 is the HCPCS code for “Services provided as part of a phase i clinical trial” in CMS’s October 2026 release, in effect from Oct 1, 2026.
Official description
S9988Services provided as part of a phase i clinical trial
Short description: Serv part of phase i trial
HCPCS · United States
Medicare details
The indicators CMS publishes with S9988 in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Not payable by Medicare
- Medicare pricing
- Service not separately priced by Part B (e.g., services not covered, bundled, used by Part A only, etc.)
- Type of service
- Other medical items or services
- BETOS category
- Undefined codes
- Added
- Apr 1, 2004
Where S9988 sits
- 1S codesTemporary national codes (non-Medicare)
- 2Active code S9988Services provided as part of a phase i clinical trial
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 S9988 mean?
S9988 is the HCPCS code for “Services provided as part of a phase i clinical trial” in CMS’s HCPCS Level II October 2026 release.
Does Medicare cover S9988?
CMS lists S9988’s Medicare coverage as “Not payable by Medicare” and its pricing as “Service not separately priced by Part B (e.g., services not covered, bundled, used by Part A only, etc.)”. 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 S9988
All S codesS9975Transplant related lodging, meals and transportation, per diemS9976Lodging, per diem, not otherwise classifiedS9977Meals, per diem, not otherwise specifiedS9981Medical records copying fee, administrativeS9982Medical records copying fee, per pageS9986Not medically necessary service (patient is aware that service not medically necessary)S9989Services provided outside of the united states of america (list in addition to code(s) for service(s))S9990Services provided as part of a phase ii clinical trialS9991Services provided as part of a phase iii clinical trialS9992Transportation costs to and from trial location and local transportation costs (e.g., fares for taxicab or bus) for clinical trial participant and one caregiver/companionS9994Lodging costs (e.g., hotel charges) for clinical trial participant and one caregiver/companionS9996Meals for clinical trial participant and one caregiver/companion