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States expanding Medicaid eligibility under the Affordable Care Act had a 6% lower rate of opioid overdose deaths by county after the expansion than did other states, according to a reported Friday in JAMA Network Open. Specifically, counties in states that expanded Medicaid had an 11% lower rate of heroin overdose deaths and 10% lower rate of overdose deaths involving synthetic opioids than counties in non-expansion states. However, Medicaid expansion was associated with an 11% higher rate of methadone-related overdose deaths.