In 2018, the number of Medicaid prescriptions dispensed for buprenorphine maintenance treatment were more than three times higher in states that expanded Medicaid, at 41 prescriptions per 1,000 beneficiaries in non-expansion states compared to 138 prescriptions per 1,000 in expansion states. During 2018, 6.2 million buprenorphine prescriptions were dispensed, and 77.2% (4.8 million) were in states that expanded Medicaid. Between 2011 and 2018, the number of Medicaid prescriptions dispensed for buprenorphine maintenance treatment increased from 1.3 million to 6.2 million. The rate per 1,000 enrollees aged 12 and older tripled, from . . .