Preventable Hospitalization Trends Before and After the Affordable Care Act

Area of Science:

• Health Services Research
• Public Health Policy
• Health Economics

Background:

• The Patient Protection and Affordable Care Act (ACA) aimed to increase health insurance coverage.
• Increased insurance may improve primary care access and reduce preventable hospitalizations.
• Medicaid expansion is a key component of the ACA's strategy.

Purpose of the Study:

• To evaluate the impact of the ACA and subsequent Medicaid expansion on preventable hospitalization rates.
• To analyze trends in preventable hospitalizations across 26 states between 2005 and 2017.

Main Methods:

• Population-based study using the Healthcare Cost and Utilization Project National Inpatient Sample database (2005-2017).
• Logistic regression and trend analysis to assess changes in hospitalization rates.
• Inclusion criteria: individuals aged 18-64 with preventable condition codes (ICD-9/10).

Main Results:

• Over 45 million preventable hospital admissions were recorded from 2005-2017.
• Preventable hospitalization rates decreased significantly post-ACA (12.0% to 10.8%) and post-Medicaid expansion (11.5% to 10.6%).
• Specific conditions like bacterial pneumonia, COPD, and asthma showed significant declines after Medicaid expansion.

Conclusions:

• Medicaid expansion is associated with reduced preventable hospitalizations.
• States should prioritize Medicaid expansion to improve population health outcomes.
• Preventable hospitalization rates can serve as a quality metric for primary care accessibility and effectiveness.