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October 8, 2025Health Affairs

Reduced Medicare Advantage Insurer Concentration Associated With Small Improvements In Market Outcomes, 2013–23

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Authors

BGBowen GarrettUrban InstituteJHJohn HolahanJohns Hopkins University

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Implication

Analysis reveals small benefits of lower insurer concentration on medicaid payments and premiums.

Key Points

  • Reduced medicare advantage insurer concentration is associated with lower payments and individual premiums.
  • The average number of insurers per county increased, and market concentration measured by the Herfindahl-Hirschman Index declined.
  • Despite reductions in concentration, the benefits for medicare beneficiaries remain quantitatively small, indicating limited impact.
  • Further reductions in concentration are necessary for significant market improvements for medicare advantage enrollees.

Cite This Study

Garrett et al. (2025) studied this question.

synapsesocial.com/papers/68e6679587ecc93a24d174a4https://doi.org/10.1377/hlthaff.2025.00119
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Medicare Advantage: National Carriers Expand Market Share While Regional Carriers Without Affiliation Decline, 2012–232024 · 12 citations
  2. 2Reducing Medicare Advantage Benchmarks Will Decrease Plan Generosity, But Those Effects Will Likely Be Modest2023 · 24 citations
  3. 3An Economic History of Medicare Part C2011 · 164 citations
  4. 4Insurer Market Power Lowers Prices In Numerous Concentrated Provider Markets2017 · 57 citations
  5. 5Do Larger Health Insurance Subsidies Benefit Patients or Producers? Evidence from Medicare Advantage2018 · 128 citations