Mich. Comp. Laws § 550.618
Each insurer issuing credit life insurance or credit accident and health insurance shall file with the commissioner its schedules of premium rates for use in connection with such insurance. Any insurer may revise such schedules from time to time, and shall file such revised schedules with the commissioner. No insurer shall issue any credit life insurance policy or credit accident and health insurance policy for which the premium rate exceeds that determined by the schedules of such insurer as then on file with the commissioner. The commissioner may require the filing of the schedule of premium rates for use in connection with and as a part of the specific policy filings as provided by sections 12 to 17. Each individual policy, group certificate or notice of proposed insurance of credit life insurance and credit accident and health insurance shall provide that in the event of termination of the insurance prior to the scheduled maturity date of the indebtedness, any refund of premium due shall be paid or credited promptly to the person entitled thereto: Provided, however, That the commissioner shall prescribe a minimum refund and no refund which would be less than such minimum need be made. The formula to be used in computing such refund shall be filed with the commissioner. If a creditor requires a debtor to make a payment in connection with credit life insurance and credit accident and health insurance and an individual policy or group certificate of insurance is not issued, the creditor shall immediately give written notice to such debtor and shall promptly make an appropriate credit to the account.
MCL 550.618