190.830.  Federal financial participation required. — The requirements of sections 190.800 to 190.830 shall apply only so long as the revenues generated under section 190.800 are eligible for federal financial participation as provided in sections 190.800 to 190.836 and payments are made under section 190.800.  For the purpose of this section, "federal financial participation" means the federal government's share of Missouri's expenditures under the MO HealthNet program.  Notwithstanding any other provision of this section to the contrary, in the event federal financial participation is either denied, discontinued, reduced in excess of five percent per year, or no longer available for the revenues generated under section 190.800, the director of the department of social services shall cause disbursement of all moneys held in the ambulance service reimbursement allowance fund to be made to all ambulance services in accordance with rules promulgated by the department of social services, along with a full accounting of such disbursements, within forty-five days of receipt of notice thereof by the department of social services.