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  • Medicare 101

    Feature

    This Health Policy 101 chapter explores Medicare, a federal health insurance program covering more than 68 million people, established in 1965 for people age 65 or older and later expanded to cover people under age 65 with long-term disabilities. In addition to detailing Medicare eligibility, coverage, and spending, the chapter examines the increased role of private plans in providing benefits and the financing challenges posed by increasing health care costs and an aging population.

  • Prior Authorization Metrics Provide New Insights into Insurer Practices, but Gaps Remain

    Issue Brief

    This analysis of available 2025 prior authorization data finds insurers denied at least 1 in 8 standard requests for prior authorization across three insurance markets: Medicare Advantage, Medicaid managed care, and the federally facilitated ACA Marketplaces. Denial rates varied wide segments by insurer. The analysis highlights limitations of the data and challenges for consumers interpreting it.

  • 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.

  • Many Medicare Part D Stand-Alone Drug Plan Enrollees Will See Modest Premium Increases for 2027, But Others Could Pay Much More If They Don’t Switch Plans

    Issue Brief

    This brief analyzes the Medicare Part D stand-alone prescription drug plan (PDP) market for 2027. The analysis shows that there will be a modest reduction in the number of PDPs for 2027, along with modest premium increases less than $10 per month for many enrollees, but much larger monthly premium increases of $50 or more for others if they don’t change plans.

  • Tracking Medicare Health and Prescription Drug Plans Report—May 2010

    Report

    This brief presents current monthly data on Medicare Advantage plan participation, enrollment and penetration. It also summarizes recent activities by the Centers for Medicare and Medicaid Services (CMS), participating health plans, and the research community pertaining to the Medicare Advantage program and prescription drug plans that began serving the Medicare population in January 2006. The report was prepared by researchers at Mathematica Policy Research Inc. May 2010 Report (.pdf) Previous Tracking Reports

  • Medigap Enrollment Among New Medicare Beneficiaries: How Many 65-Year Olds Enroll In Plans With First-Dollar Coverage?

    Issue Brief

    On March 26, 2015, the House of Representatives passed H.R. 2, the Medicare Access and CHIP Reauthorization Act of 2015, which would replace the Sustainable Growth Rate (SGR) formula, among other changes; the bill is currently pending in the U.S. Senate. H.R. 2 includes a provision that would prohibit Medicare supplemental insurance (Medigap) policies from covering the Part B deductible for people who become eligible for Medicare on or after January 1, 2020. This data…

  • Medicare: An Overview

    Feature

    This slideshow explains key elements of the Medicare program, which now provides health coverage to 55 million people — including 46 million people age 65 and older and another 9 million younger adults with permanent disabilities.

  • Health Insurer Financial Performance Through September 2020

    Issue Brief

    In this brief, we analyze third quarter data from 2018 to 2020 to examine how insurance markets performed financially through the end of September. Average margins remained relatively high compared to the same point in recent years, suggesting many insurers remained profitable even as non-COVID-related care returned in the summer and fall.

  • Medicare Part D: A First Look at Medicare Prescription Drug Plans in 2021

    Issue Brief

    This issue brief provides an overview of the Medicare Part D prescription drug benefit plan landscape for 2021, with a focus on stand-alone drug plans. It includes national and state-level data on plan availability, premiums, benefit design, cost sharing, information about premium-free plans for low-income beneficiaries, and information about the national Part D drug plans available in 2021.