This bill amends Title XIX of the Social Security Act to significantly alter how State Medicaid programs cover medication for opioid use disorder (OUD). It mandates that states provide coverage for at least one formulation of each type of OUD medication, including long-lasting injectable options if available. Crucially, this coverage must be offered without prior authorization or limitations on dosage , aiming to streamline access to these vital treatments. Furthermore, the legislation directs the Medicaid and CHIP Payment and Access Commission (MACPAC) to conduct a comprehensive study. Within one year, MACPAC must report to Congress on the use of utilization management controls for OUD treatment across all states, assessing their administrative burden on clinicians and identifying other policies that hinder patient access. The bill's provisions generally take effect one year after enactment, with a grace period for states requiring new legislation.