(1) Manifest in an individual younger than 18 years or, if the individual is in a residential treatment center, younger than 21 years;

(2) Diagnosed according to the current diagnostic classification system that is recognized by the Secretary; and

(3) Characterized by a functional impairment that substantially interferes with or limits the child's role or functioning in the family, school, or community activities.

(2) The Department shall apply to the Health Care Financing Administration of the federal Department of Health and Human Services for a home- and community-based services waiver under § 1915(c) of the federal Social Security Act in order to receive federal matching funds for services to autistic children aged 1 through 21 years who would otherwise require institutionalization in an institution for the developmentally disabled.

(1) Respite services;

(2) Family training and education;

(3) Day treatment services;

(4) Therapeutic integration services;

(5) Intensive individual support services;

(6) Therapeutic living services;

(7) Intensive in-home intervention services; and

(8) Specialized case management services.