Mich. Comp. Laws § 550.1403

Sec. 403. (1) A health care corporation, on a timely basis, shall pay to a member benefits as are entitled and provided under the applicable certificate. When not paid on a timely basis, benefits payable to a member shall bear simple interest from a date 60 days after a satisfactory claim form was received by the health care corporation, at a rate of 12% interest per annum. The interest shall be paid in addition to, and at the time of payment of, the claim. Section 2006(7) to (14) of the insurance code of 1956, 1956 PA 218, MCL 500.2006, applies to a health care corporation. (2) A health care corporation shall specify in writing the materials that constitute a satisfactory claim form not later than 30 days after receipt of a claim, unless the claim is settled within 30 days. If a claim form is not supplied as to the entire claim, the amount supported by the claim form shall be considered to be paid on a timely basis if paid within 60 days after receipt of the claim form by the corporation. This subsection does not apply to a health care corporation when paying a claim under section 2006(7) to (14) of the insurance code of 1956, 1956 PA 218, MCL 500.2006.