Subject to appropriation, the directors of the departments of health and senior services and social services, in consultation with the commissioner of education of the department of elementary and secondary education, may provide grants from the health initiatives fund to assist public schools, public school districts, or local public health departments in expanding school children health services for all school age children. Preference in grants shall be given based on the greater need for school children health services and the least ability to fund such services. The directors shall jointly promulgate rules and regulations governing the grants pursuant to section 192.013 and section 660.017. The director of social services may also provide Medicaid payment incentives.