Within the limits of legislative appropriation therefor and in accordance with rules established by the department, the department may defray the costs of preventive diagnostic, therapeutic, rehabilitative, or palliative items or services furnished medical assistance eligible individuals by regional human service centers or designated behavioral health providers. Within the limits of legislative appropriations and to the extent permitted by state and federal law and regulations established thereunder, it is the intent of the legislative assembly that federal funds available under title XIX of the Social Security Act [42 U.S.C. 1396 et seq.] be utilized to defray the costs of identifiable mental health clinic services furnished eligible individuals in regional human service centers and that federal funds available under title XX of the Social Security Act [42 U.S.C. 1397 et seq.] be utilized to defray the costs of identifiable social services furnished to eligible individuals by county social service boards and regional human service centers.