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  • Title: The Impact of the ACA Medicaid Expansions on Health Insurance Coverage through 2015 and Coverage Disparities by Age, Race/Ethnicity, and Gender.
    Author: Wehby GL, Lyu W.
    Journal: Health Serv Res; 2018 Apr; 53(2):1248-1271. PubMed ID: 28517042.
    Abstract:
    OBJECTIVE: Examine the ACA Medicaid expansion effects on Medicaid take-up and private coverage through 2015 and coverage disparities by age, race/ethnicity, and gender. DATA SOURCES: 2011-2015 American Community Survey for 3,137,989 low-educated adults aged 19-64 years. STUDY DESIGN: Difference-in-differences regressions accounting for national coverage trends and state fixed effects. PRINCIPAL FINDINGS: Expansion effects doubled in 2015 among low-educated adults, with a nearly 8 percentage-point increase in Medicaid take-up and 6 percentage-point decline in uninsured rate. Significant coverage gains were observed across virtually all examined groups by age, gender, and race/ethnicity. Take-up and insurance declines were strongest among younger adults and were generally close by gender and race/ethnicity. Despite the increased take-up however, coverage disparities remained sizeable, especially for young adults and Hispanics who had declining but still high uninsured rates in 2015. There was some evidence of private coverage crowd-out in certain subgroups, particularly among young adults aged 19-26 years and women, including in both individually purchased and employer-sponsored coverage. CONCLUSIONS: The ACA Medicaid expansions have continued to increase coverage in 2015 across the entire population of low-educated adults and have reduced age disparities in coverage. However, there is still a need for interventions that target eligible young and Hispanic adults.
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