Michigan Compiled Laws, Chapter 500. Insurance Code of 1956 § 500.3525

Sec. 3525. (1) Except as otherwise provided in subsection (2), if a health maintenance organization desires to change a contract it offers to enrollees or desires to change a rate charged, a copy of the proposed revised contract or rate shall be filed with the commissioner and shall not take effect until 60 days after the filing, unless the commissioner approves the change in writing before the expiration of 60 days after the filing. If the commissioner considers that the proposed revised contract or rate is illegal or unreasonable in relation to the services provided, the commissioner, not more than 60 days after the proposed revised contract or rate is filed, shall notify the organization in writing, specifying the reasons for disapproval or for approval with modifications. For an approval with modifications, the notice shall specify what modifications in the filing are required for approval, the reasons for the modifications, and that the filing becomes effective after the modifications are made and approved by the commissioner. The commissioner shall schedule a hearing not more than 30 days after receipt of a written request from the health maintenance organization, and the revised contract or rate shall not take effect until approved by the commissioner after the hearing. Within 30 days after the hearing, the commissioner shall notify the organization in writing of the disposition of the proposed revised contract or rate, together with the commissioner's findings of fact and conclusions.

(2) If the revised contract or rate is the result of collective bargaining and affects only the members of the groups engaged in the collective bargaining, subsection (1) does not apply but the revised contract or rate shall be immediately filed with the commissioner.

(3) Except as provided in this subsection with respect to health maintenance contracts issued in connection with state and federal health programs under section 3571,  1 not less than 30 days before the effective date of a proposed change in a health maintenance contract or the rate charged, the health maintenance organization shall issue to each subscriber or group of subscribers who will be affected by the proposed change a clear written statement stating the extent and nature of the proposed change.With respect to health maintenance contracts issued in connection with state and federal health programs under section 3571, advance notice is not required if the change in a health maintenance contract or rate arises from a change in the law, a state or federal administrative order, or an executive order and the change does not provide for a reasonable period of time for a health maintenance organization to give the required notice. In that case, the health maintenance organization shall provide notice within 30 days after the effective date of the change. If the commissioner has approved a proposed change in a contract or rate in writing before the expiration of 60 days after the date of filing, the organization immediately shall notify each subscriber or group of subscribers who will be affected by the proposed change.