; and (v) provide to applicable pharmacies and respective contracting entities all such pricing data in an .xml spreadsheet format or a comparable easily accessible and complete spreadsheet format. (B) Prescription drug pricing standard defined For purposes of subparagraph (A), a standard for reimbursement of a pharmacy is any methodology or formula for varying the pricing of a drug or drugs during the term of the pharmacy reimbursement contract that is based on the cost of the drug involved, including drug pricing references and amounts that are based upon average wholesale price, wholesale average cost, average manufacturer price, average sales price, maximum allowable cost (MAC), or other costs, whether publicly available or not. . (c) Effective date The amendments made by this section shall apply to plan years beginning on or after January 1, 2020. 3. Prescription drug transparency in the Federal Employees Health Benefits program (a) In general Section 8902 of title 5, United States Code, is amended by adding at the end the following new subsections: (p) A contract may not be made or a plan approved under this chapter under which a carrier has an agreement with a pharmacy benefits manager (in this subsection referred to as a PBM ) to manage prescription drug coverage or to control the costs of the prescription drug coverage if the PBM— (1) requires that an individual enrolled under such contract or plan use a retail pharmacy, mail order pharmacy, specialty pharmacy, or other pharmacy entity providing pharmacy services in which the PBM has an ownership interest or that has an ownership interest in the PBM