Mich. Admin. Code R. 500.351
Rule 1. Annually, the commissioner of insurance shall adjust the maximum amount of unearned premiums which shall constitute a covered claim prescribed in section 7925(2)(a) of Act No. 218 of the Public Acts of 1956, as amended, being S500.7925(2)(a) of the Michigan Compiled Laws, by the ratio of the national consumer price index as calculated by the United States department of labor for all items for March of each year to the corresponding consumer price index 1 year earlier, rounded to the nearest dollar. If the index is unavailable, the commissioner shall make a reasonable approximation. The effective date of the adjustment shall be July 1 of each year. The commissioner shall notify all interested parties of the adjustment.
Mich. Admin. Code R. 500.351