drugs included in payment category 3 described in subparagraph (C)(i), are one unit of HCPCS code 96413 plus four units of HCPCS code 96415 (as identified as of July 1, 2017, and as subsequently modified by the Secretary). (E) Clarifications (i) Infusion drug administration day For purposes of this subsection, a reference, with respect to the furnishing of transitional home infusion drugs or home infusion drugs to an individual by an eligible home infusion supplier, to payment to such supplier for an infusion drug administration calendar day in the individual’s home shall refer to payment only for the date on which professional services (as described in section 1861(iii)(2)(A)) were furnished to administer such drugs to such individual. For purposes of the previous sentence, an infusion drug administration calendar day shall include all such drugs administered to such individual on such day. (ii) Treatment of multiple drugs administered on same infusion drug administration day In the case that an eligible home infusion supplier, with respect to an infusion drug administration calendar day in an individual’s home, furnishes to such individual transitional home infusion drugs which are not all assigned to the same payment category under subparagraph (C), payment to such supplier for such infusion drug administration calendar day in the individual’s home shall be a single payment equal to the amount of payment under this paragraph for the drug, among all such drugs so furnished to such individual during such calendar day, for which the highest payment would be made under this paragraph. (F) Eligible home infusion suppliers In this paragraph, the term eligible home infusion supplier means a supplier that is enrolled under this part as a pharmacy that provides external infusion pumps and external infusion pump supplies and that maintains all pharmacy licensure requirements in the State in which the applicable infusion drugs are administered. (G) Implementation Notwithstanding any other provision of law, the Secretary