The Government Accountability Office (GAO) released a report examining how vertical integration among Medicare Part D plan sponsors, pharmacy benefit managers (PBMs), and pharmacies affects prescription drug utilization, payments, and beneficiary costs. GAO analyzed 2023 Medicare Part D data for four large, vertically integrated plan sponsors and found that their owned pharmacies, which primarily dispensed prescriptions through mail order, accounted… (Eisen, October 5, 2026) #Medicare Part D