42 C.F.R. § 419.47
(a) Creation of a new HCPCS code for Category B IDE studies that have a treatment arm and a placebo control arm. CMS will create a new HCPCS code, or revise an existing HCPCS code, to describe a Category B IDE study, which will include both the treatment and placebo control arms, related device(s) of the study, as well as routine care items and services, as specified under § 405.201 of this chapter, when CMS determines that:
(b) Payment for Category B IDE Studies. Where CMS creates a new HCPCS code or revises an existing HCPCS code under paragraph (a) of this section, CMS will:
[87 FR 72291, Nov. 23, 2022, as amended at 89 FR 94590, Nov. 27, 2024; 90 FR 54086, Nov. 25, 2025]