The United States GAO (General Accountability Office) released their report on Rebates in the Medicare Part D Program this month (September 2023). GAO-23-105270, MEDICARE PART D: CMS Should Monitor Effects of Rebates on Plan Formularies and Beneficiary Spending The study was conducted utilizing 2021 Part D Formulary data and included the review of 2020 rebate agreements negotiated between six drug manufacturers and six Part D plan sponsors, or PBMs on their behalf, for 24 bra