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Issues And Trends In Healthcare Delivery System01:29

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Updated: Jun 26, 2025

Inverse Probability of Treatment Weighting Propensity Score using the Military Health System Data Repository and National Death Index
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Medicaid Expansions and Private Insurance 'Crowd-Out' (1999-2019).

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PubMed
Summary
This summary is machine-generated.

Medicaid expansion in the U.S. led to a 1.5% decrease in private insurance coverage for adults aged 18-64. This "crowd-out" effect was observed over twenty years, highlighting long-term impacts.

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Area of Science:

  • Health Economics
  • Public Policy
  • Econometrics

Background:

  • Medicaid expansions have historically raised concerns about private health insurance "crowd-out".
  • Previous studies were limited by short timeframes and state-level data.
  • This research provides a comprehensive, long-term national analysis.

Purpose of the Study:

  • To evaluate the impact of Medicaid expansions on private insurance coverage rates across the U.S.
  • To address limitations of prior research by using a 20-year dataset and advanced econometric techniques.
  • To quantify the extent of private insurance crowd-out attributable to Medicaid expansions.

Main Methods:

  • Utilized U.S. Census Bureau data on private insurance coverage for adults aged 18-64 (1999-2019).
  • Employed a staggered Two-Way Fixed Effects Difference-in-Differences regression model.
  • Applied four novel econometric methods to mitigate bias from staggered adoption and tested for pre-treatment trends and heterogeneous effects.

Main Results:

  • Medicaid expansion was associated with a statistically significant 1.5%-point decline in private insurance rates (p < 0.001).
  • Observed significant heterogeneity in crowd-out effects over time, peaking approximately four years post-expansion.
  • The magnitude of crowd-out suggests a notable, albeit debated, impact on private insurance markets.

Conclusions:

  • Medicaid expansions have a measurable, negative effect on private health insurance coverage rates nationally.
  • The findings underscore the importance of considering long-term and nationwide effects when assessing health policy interventions.
  • Further research is recommended to fully understand the implications of this crowd-out effect.