The department of public health and human services shall use to maximum efficiency the resources of state government in a coordinated effort to:
(1) develop and maintain comprehensive services and programs in the fields of:
(a) mental health; and
(b) chemical dependency;
(2) provide, according to the requirements of Title 53, chapter 20, inpatient institutional care for persons with developmental disabilities who require institutional care; and
(3) provide nursing home care for honorably discharged veterans as provided by law.