; and (2) the feasibility and policy implications of shifting coverage of drugs and biologicals for which payment is currently made under such part B to such part D. (b) Report (1) In general Not later than June 30, 2021, the Commission shall submit to Congress a report containing the results of the study conducted under subsection (a). (2) Contents The report under paragraph (1) shall include information, and recommendations as the Commission deems appropriate, regarding— (A) formulary design under such part D; (B) the ability of the benefit structure under such part D to control total spending on drugs and biologicals for which payment is currently made under such part B; (C) changes to the bid process under such part D, if any, that may be necessary to integrate coverage of such drugs and biologicals into such part D; and (D) any other changes to the program that Congress should consider in determining whether to shift coverage of such drugs and biologicals from such part B to such part D. 148. Taking steps to fulfill treaty obligations to tribal communities (a) GAO study The Comptroller General shall conduct a study regarding access to, and the cost of, prescription drugs among Indians. The study shall include— (1) a review of what Indian health programs pay for prescription drugs on reservations and in urban centers relative to other consumers; (2) recommendations to align the value of prescription drug discounts available under the Medicaid drug rebate program established under section 1927 of the Social Security Act ( 42 U.S.C. 1396r–8 ) with prescription drug discounts available to Tribal communities through the purchased/referred care program of the Indian Health Service for physician administered drugs