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Medicaid expansion and 30-day hospital readmissions: A nationwide study

Sami Tahhan1, Cynthia Avila2, Chloe Carr3

  • 1Department of Medicine, Eastern Virginia Medical School, Norfolk, Virginia, USA.

Journal of Hospital Medicine
|June 18, 2024
PubMed

Insights

Medicaid expansion (ME) in states led to greater reductions in 30-day hospital readmissions for pneumonia, heart failure, and acute myocardial infarction compared to non-expansion states.

Area of Science:

  • Health Policy
  • Public Health
  • Health Services Research

Background:

  • The Patient Protection and Affordable Care Act (ACA) aimed to improve health insurance affordability through subsidies and Medicaid expansion (ME).
  • State adoption of ME varied, creating a natural experiment to study its impact on healthcare outcomes.
  • Hospital readmissions remain a significant concern in healthcare quality and cost.

Purpose of the Study:

  • To investigate the impact of state Medicaid expansion (ME) status on 30-day hospital readmission rates.
  • To compare readmission trends for pneumonia, heart failure (HF), and acute myocardial infarction (AMI) between states that expanded Medicaid and those that did not.

Main Methods:

  • Utilized a difference-in-difference framework analyzing national hospital readmission data from 2005 to 2019.
  • Categorized states into those expanding Medicaid in 2014 (ME-States) and those not expanding until 2019 (non-ME States).
  • Adjusted for hospital and population characteristics to assess the relationship between ME and 30-day readmissions for pneumonia, HF, and AMI.

Main Results:

  • Hospitals in ME-States consistently showed higher mean readmission rates than non-ME-States both before and after ME implementation.
  • Following ME, ME-States experienced significantly larger reductions in 30-day readmissions for pneumonia (-0.12%), HF (-0.18%), and AMI (-0.23%) compared to non-ME states.
  • These reductions were statistically significant across all three conditions studied.

Conclusions:

  • State Medicaid expansion is associated with significant reductions in 30-day hospital readmissions for major cardiovascular and respiratory conditions.
  • Despite initial higher readmission rates, states expanding Medicaid demonstrated improved post-expansion trends in reducing readmissions.
  • Findings suggest that Medicaid expansion can be an effective policy lever for improving post-hospitalization care and reducing readmission burdens.

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