The Centers for Medicare & Medicaid Services (CMS) recently finalized a rule that expands Medicare coverage for Opioid Use Disorder (OUD). Recent legislation, the Substance Use Disorder Prevention that Promotes Opioid Recovery and Treatment for Patients and Communities (SUPPORT) Act, established a pathway for this more comprehensive Medicare coverage of OUD services. Beginning on January 1, 2020, Medicare Part B will cover OUD treatment—including methadone for Medication Assisted Therapy (MAT)—furnished by an Opioid Treatment Program (OTP) under a bundled payment mechanism. This means a significant improvement in access to OUD care for people with Medicare, including for those who are dually eligible for Medicaid.