; minimum drug discounts required to be passed through to the plan sponsor before the period at the end; and (2) by adding at the end the following new subsection: (f) Minimum drug discounts required To be passed through to the plan sponsor (1) Requirement Beginning January 1, 2020, a PBM that manages prescription drug coverage under a contract with a PDP sponsor or MA organization described in subsection (b)(1) or a qualified health benefits plan described in subsection (b)(2), shall, with respect to the plan sponsor of a health benefits plan, pass through to the plan sponsor a minimum percent (as established by the Secretary) of the aggregate amount of the rebates, discounts, or price concessions that the PBM negotiates that are attributable to patient utilization under the plan. (2) Establishment The Secretary shall establish the minimum percent described in paragraph (1) in such a manner as will ensure that patients receive the maximum benefit of rebates, discounts, or price concessions while taking into account the costs of negotiating such rebates, discounts, and price concessions. (3) Enforcement A PDP sponsor of a prescription drug plan or an MA organization offering an MA–PD plan under part D of title XVIII may not contract with a PBM that is not in compliance with the requirement under paragraph (1). . (b) Effective date The amendments made by subsection (a) shall take effect on January 1, 2020. 4. Part D negotiated prices required to take into account all price concessions at the point-of-sale (a) In general Section 1860D–2(d)(1)(B) of the Social Security Act ( 42 U.S.C. 1395w–102(d)(1)(B) ) is amended— (1) by striking prices .—For purposes and inserting “ prices .— (i) In general For purposes