Many adults with intellectual and/or developmental disabilities (IDD) can access health and long-term services and supports (LTSS) through Medicaid. States are reforming their Medicaid LTSS programs from a fee-for-service model to a Medicaid managed LTSS (MLTSS) approach, anticipating improved quality of care and reduced costs, although there is limited evidence of MLTSS effectiveness. This study's objective was to contribute to the growing MLTSS research literature by describing MLTSS implementation in Kansas for adults with IDD. Thirty-one stakeholders completed in-depth semi-structured interviews, representing state or regional groups, service coordination providers, and family caregivers. Findings identify key aspects of the Centers for Medicare and Medicaid Services' new MLTSS regulations in the design and implementation of MLTSS programs.