; and (II) by striking January 2021 and inserting January 2016 ; (ii) in subparagraph (B), by striking December 1, 2020 and inserting December 31, 2015 ; and (iii) in subparagraph (C), by striking January 2021 and inserting January 2016 . (3) Effective date The amendments made by this subsection shall take effect as if included in the enactment of section 11101 of Public Law 117–169 . (b) Covered part D drugs (1) Application of prescription drug inflation rebates to drugs furnished in the commercial market Section 1860D–14B of the Social Security Act ( 42 U.S.C. 1395w–114b ) is amended— (A) in subsection (b)— (i) in paragraph (1)— (I) in subparagraph (A)(i), by striking the total number of units and all that follows through the semicolon and inserting the following: the total number of units that are used to calculate the average manufacturer price of such dosage form and strength with respect to such part D rebatable drug, as reported by the manufacturer of such drug under section 1927 for each month, with respect to such period; ; and (II) by striking subparagraph (B) and inserting the following: (B) Excluded units For purposes of subparagraph (A)(i), the Secretary shall exclude from the total number of units for a dosage form and strength with respect to a part D rebatable drug, with respect to an applicable period, the following: (i) Units of each dosage form and strength of such part D rebatable drug for which payment was made under a State plan under title XIX (or waiver of such plan), as reported by States under section 1927(b)(2)(A). (ii) Units of each dosage form and strength of such part D rebatable drug for which a rebate is paid under section 1847A(i). (iii) Beginning with plan year 2026, units of each dosage form and strength of such part D rebatable drug for which the manufacturer provides a discount under the program under section 340B of the Public Health Service Act.