The Residential Recovery for Seniors Act expands Medicare coverage to include residential substance use disorder treatment services for seniors, adding three levels of care to Medicare Part A: clinically managed low-intensity services, clinically managed high-intensity services, and medically managed residential services. Each service level comes with specific requirements for nursing, medical monitoring, medication access, and clinical assessments, with periodic reviews required to confirm continued medical necessity. The bill establishes a new Medicare payment system beginning October 1, 2026, that will reimburse facilities using daily rates adjusted for the intensity of services provided, designed to cover reasonable facility costs. This legislation aims to help older Americans struggling with addiction by making specialized residential rehabilitation services available through Medicare rather than requiring out-of-pocket payment or leaving this population without access to needed treatment.