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HCPCS Level II
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S9991

S9991

Services provided as part of a phase iii clinical trial

The HCPCS code for services provided as part of a phase iii clinical trial is S9991.

Source: official CMS Alpha-Numeric HCPCS file (Level II only). Informational only — verify against current CMS/payer sources before use in billing.

Data current as of FY2026 CMS/NCHS release. Not affiliated with or endorsed by CMS, HHS, or NCHS.

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