The Center for Health Workforce Studies in collaboration with the New York State Department of Health developed a statewide set of Medicaid-based rational service areas (Medicaid RSAs), based on commuting patterns of Medicaid patients from their place of residence to their provider. Medicaid RSAs were assessed using a deprivation score based on demographic and health care indicators to identify those RSAs with the highest need. This webinar describes the approach used to develop and assess Medicaid RSAs.