; and (B) the determination of— (i) the total number of units of the billing and payment code under paragraph (3)(A)(i); and (ii) the inflation-adjusted payment amount under paragraph (3)(C). . (c) Conforming amendment to part B ASP calculation Section 1847A(c)(3) of the Social Security Act (42 U.S.C. 1395w–3a(c)(3)) is amended by inserting or subsection (h) after section 1927 . 372. Market based part B pricing index Notwithstanding any provision of part B of title XVIII of the Social Security Act, the Secretary of Health and Human Services may make payments for drugs payable under such part based on an international pricing index. In using such an index, the Secretary shall take into account whether the market of each country included in such index is a price-controlled or free market and give more weight under such index to countries with market-based drug policies. 373. Innovation model testing of Medicare drug payments Notwithstanding any provision of section 1115A, the Secretary of Health and Human Services may, under such section, test a model to integrate benefits provided for drugs under parts A, B, and D of title XVIII of the Social Security Act. 374. Modification of maximum rebate amount under Medicaid drug rebate program (a) In general Subparagraph (D) of section 1927(c)(2) of the Social Security Act ( 42 U.S.C. 1396r–8(c)(2) ) is amended to read as follows: (D) Maximum rebate amount (i) In general Except as provided in clause (ii), in no case shall the sum of the amounts applied under paragraph (1)(A)(ii) and this paragraph with respect to each dosage form and strength of a single source drug or an innovator multiple source drug for a rebate period exceed— (I) for rebate periods beginning after December 31, 2009, and before September 30, 2022, 100 percent of the average manufacturer price of the drug