Beginning on the first day of the calendar quarter in which the director of the department of health and human services notifies the secretary of state and the department in writing that the federal Centers for Medicare and Medicaid Services has approved its request for a waiver of the broad-based and uniformity provisions of section 1903(w)(3)(B) and (C) of title XIX of the social security act, 42 USC 1396b, for implementation of this act or October 1, 2018, whichever is later, there is levied and imposed an annual assessment on the number of member months for each insurance provider reported on its annual financial statement filed with the department of insurance and financial services or the department of health and human services, whichever is applicable, for the previous calendar year at the following rates. For the initial year of implementation only, the department shall notify each insurance provider after June 15, 2018 but before October 15, 2018, of the number of member months and the rate imposed on these member months in accordance with subsection (1)(a)(i) and of its assessment, prorated for 2 quarters, due based on the insurance provider’s member months for the previous calendar year.