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  • How Medicare Advantage Rebates Disadvantage Medicare’s Stand-Alone Drug Plan Market

    Issue Brief

    The private plans that offer the Medicare Part D benefit - stand-alone drug plans and Medicare Advantage drug plans - are increasingly are competing on uneven terms, in part because the payment system for Medicare Advantage plans enables them to lower Part D premiums or reduce Part D cost sharing, making drug coverage from Medicare Advantage plans appear considerably cheaper, or even premium-free, to the beneficiary. This brief discusses the growing instability of the Part…

  • Medicare Part D Enrollment, Premiums, and Cost Sharing in 2026

    Issue Brief

    The Medicare Part D program provides an outpatient prescription drug benefit to 56 million older adults and people with long-term disabilities in Medicare who enroll in private plans. This brief analyzes Medicare Part D enrollment, premiums, and cost sharing in 2026 and trends over time, based on data from the Centers for Medicare & Medicaid Services (CMS).

  • Examining the Potential Impact of Medicare’s New WISeR Model

    Issue Brief

    On January 1, 2026, the Center for Medicare & Medicaid Innovation (CMMI) launched the Wasteful and Inappropriate Service Reduction (WISeR) Model that establishes new prior authorization requirements in traditional Medicare. This analysis explores the potential impact of the WISeR model by examining recent spending and utilization trends in traditional Medicare for services selected for prior authorization requirements in the six model states (Arizona, New Jersey, Ohio, Oklahoma, Texas, and Washington).

  • Medicare Advantage Insurers Made Nearly 53 Million Prior Authorization Determinations in 2024

    Issue Brief

    Nearly 53 million prior authorization requests were submitted to Medicare Advantage insurers on behalf of Medicare Advantage enrollees in 2024, of which 4.1 million (7.7%) were denied. Just 11.5% of denied requests were appealed, though 80.7% of appeals overturned the initial denial in Medicare Advantage. Substantially fewer prior authorization requests were made in traditional Medicare, reflecting the small number of services subject to prior authorization requirements.