Changes in Insurance Coverage Continuity After Affordable Care Act Expansion of Medicaid Eligibility for Young Adults With Low Income in Massachusetts

Question: Did Medicaid expansion in Massachusetts change coverage continuity for child Medicaid enrollees entering young adulthood? Findings: In this cohort study of 41 247 young adults, Medicaid enrollees who turned 19 after vs before Medicaid expansion were significantly less likely to have 3 or more months without insurance coverage at ages 18 to 19 and 19 to 20 years and more likely to have continuous Medicaid coverage for 24 or more months. Meaning: Federal and state Medicaid expansions were associated with reductions in insurance disruptions and coverage gaps among child Medicaid enrollees entering young adulthood.