The Department of Intellectual and Developmental Disabilities (DIDD) is the state department charged. with operation and oversight of services and supports for people with intellectual and developmental dis-. abilities. Created as a standalone department in 2011, the department’s primary role is to operate the. state’s three 1915(c) Home and Community Based Services (HCBS) waivers for more than 8000 people with. intellectual disabilities. In addition, the state operates 37 4-bed intermediate care facilities for people with. intellectual disabilities (ICF/IID), The Harold Jordan Center and Greene Valley Developmental Center, which. is moving toward closure. Services for people with intellectual and developmental disabilities are also.