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In page Medicaid:

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A 2019 National Bureau of Economic Research paper found that when Hawaii stopped allowing Compact of Free Association (COFA) migrants to be covered by the state's Medicaid program that Medicaid-funded hospitalizations declined by 69% and emergency room visits declined by 42% for this population, but that uninsured ER visits increased and that Medicaid-funded ER visits by infants substantially increased.[15] Another NBER paper found that Medicaid expansion reduced mortality.[16]