GAO Report: Barriers to Medicaid Beneficiaries’ Access to Treatment Medications. The Government Accountability Office (GAO) identifies state and federal policies that can impose barriers to Medication-Assisted Treatment (MAT) for opioid use disorder. A 2018 study found that about 40 percent of states may not provide Medicaid coverage for some MAT medications as required by law. A 2016 study of rural physicians found that more than half of providers with waivers to prescribe medications to treat addiction were not accepting new patients.
