42 CFR §427.100

As used in this subpart, the following definitions apply: EUA Declaration means the March 27, 2020, Emergency Use Authorization (EUA) Declaration for Drugs and Biological Products under section 564 of the Food, Drug, and Cosmetic (FD&C) Act. Individual who uses such a drug or biological means a unique Medicare Part B beneficiary who was furnished the Part B drug or biological that was covered under Part B during the applicable calendar quarter, identified using final action claims data with dates of service during the calendar year set forth in § 427.101(b)(6) and with allowed charges greater than zero.