MA H1319

Requires health insurers to cover medically necessary acute treatment services, clinical stabilization services, and transitional support services for substance use disorder for up to 30 days without preauthorization, expanding current 14-day coverage

Adds "transitional support services" as a new covered category, defined as short-term residential support following clinical stabilization to help adults or adolescents transition to outpatient addiction recovery care

Applies to Group Insurance Commission plans, MassHealth/Medicaid, and all commercial health insurance policies, HMOs, and hospital/medical service plans issued or renewed in Massachusetts

Facilities must notify carriers of admission and treatment plans within 48 hours; carriers may begin utilization review on day 14 but cannot restrict or deny services until patient has received at least 30 consecutive days of treatment

Center for Health Information and Analysis must report on effects of the coverage mandate by October 1, 2026 (initial report on 14-day coverage) and October 1, 2028 (final report on 30-day coverage), with provisions taking effect October 1, 2026