Mich. Comp. Laws § 500.6604

Sec. 6604. Any number of persons, not less than 13, may associate together and form an incorporated company for the following purposes, to wit: First, To insure railway employees against loss of position resulting from discharge, suspension or retirement; Second, To insure any person against bodily injury or death by accident, or against disability on account of sickness; Third, To insure the lives and health of persons and every insurance pertaining thereto, and to grant, purchase or dispose of annuities.