Michigan Compiled Laws, Chapter 500. Insurance Code of 1956 § 500.5104

Sec. 5104. (1) Subject to the requirements of this act applicable to domestic stock insurers, domestic mutual insurers, reciprocals, or inter-insurance exchanges, and the further requirements of this chapter, 13 or more persons may organize a stock insurer or 20 or more persons may organize a mutual insurer for the purpose of transacting any or all of the following kinds of insurance: property, marine, inland navigation and transportation, casualty, or fidelity and surety, all as defined in chapter 6.  1 Once organized and authorized, the acquiring insurer is subject to all applicable provisions of this act.

(2) During the period that the acquiring insurer is a domestic stock insurer owned by a nonprofit health care corporation formed pursuant to the nonprofit health care corporation reform act, 1980 PA 350, MCL 550.1101 to 550.1704, for insurance products and services, the acquiring insurer under this chapter, whether directly or indirectly, shall only transact worker's compensation insurance and employer's liability insurance, transact disability insurance limited to replacement of loss of earnings, and act as an administrative services organization for an approved self-insured worker's compensation plan or a disability insurance plan limited to replacement of loss of earnings. This subsection does not preclude the acquiring insurer from providing either directly or indirectly noninsurance products and services as otherwise provided by law.