Not later than a date determined appropriate by the Secretary following the end of each calendar year, the head (or a designee of such head) of each Federal agency carrying out a specified government program shall, in accordance with this paragraph, report to the Secretary of Health and Human Services the total prescription drug sales for each applicable antimicrobial drug under contract with respect to such program for such calendar year. (B) Medicare Part D program For purposes of subparagraph (A), the Secretary shall report, for each applicable antimicrobial drug covered under part D of title XVIII of the Social Security Act ( 42 U.S.C. 1395w–101 et seq.), the product of— (i) the per-unit ingredient cost, as reported to the Secretary by prescription drug plans and Medicare Advantage prescription drug plans, minus any per-unit rebate, discount, or other price concession provided, as reported to the Secretary by the prescription drug plans and the Medicare Advantage prescription drug plans