CMS proposes Medicare Part D cost-sharing, PBM transparency rules under CAA 2026

CMS issued a proposed rule implementing three CAA 2026 provisions: adjusting Part D cost-sharing reductions for low-income enrollees, requiring enhanced provider lists (REAL Health Providers Act), and modernizing PBM accountability. The rule signals continued regulatory tightening on pharmacy benefit managers and expanded low-income subsidies, with industry impact pending finalization.