(b) The council shall consist of not fewer than 24 members and shall be comprised of: (i) the following 10 members, who shall serve ex officio: the commissioner of mental health, who shall serve as chair, the commissioner of children and families, the commissioner of youth services, the commissioner of developmental services, the commissioner of public health, the commissioner of elementary and secondary education, the commissioner of early education and care, the commissioner of insurance, the director of Medicaid, and the child advocate, or their designees; (ii) additional persons appointed by the secretary of health and human services from the aforementioned agencies and from the executive office of health and human services; and (iii) 1 person from each of the following organizations appointed by the secretary of health and human services from a list of nominees submitted by each organizations:- Parent/Professional Advocacy League, Inc.; Massachusetts Psychological Association, Inc.; Massachusetts Association of Behavioral Health Systems, Inc.; Massachusetts Psychiatric Society, Inc.; Childrens League of Massachusetts, Inc.; the Massachusetts chapter of the American Academy of Pediatrics; New England Council of Child and Adolescent Psychiatry, Inc.; Mental Health and Substance Abuse Corporations of Massachusetts, Inc.; the Massachusetts chapter of the National Association of Social Workers; Massachusetts Hospital Association, Inc., Blue Cross and Blue Shield of Massachusetts, Inc., Massachusetts Association for Mental Health, Inc., Massachusetts Behavioral Health Partnership, Massachusetts Society for the Prevention of Cruelty to Children, and Massachusetts Association of Health Plans, Inc.; and (iv) the following 4 community and provider members appointed by the secretary of health and human services: 2 persons under the age of 22 who are consumers of behavioral health services; a physician, pediatrician or child and adolescent psychiatrist from a community health center; and a professional with expertise in human services workforce development. The members of the childrens behavioral health advisory council shall represent the culturally and linguistically diverse populations served by the executive office and its agencies. The terms for nongovernmental members shall be 3 years. Upon the expiration of his term, a nongovernmental member shall serve until a successor has been appointed; provided, however, that if a vacancy exists prior to the expiration of a term, another nongovernmental member shall be appointed to complete the unexpired term.