Mich. Comp. Laws § 500.3406a

Sec. 3406a. An insurer that delivers, issues for delivery, or renews in this state a health insurance policy shall offer benefits for prosthetic devices to maintain or replace the body parts of an individual who has undergone a mastectomy. This coverage must provide that reasonable charges for medical care and attendance for an individual who receives reconstructive surgery following a mastectomy or who is fitted with a prosthetic device are covered benefits after the individual's attending physician has certified the medical necessity or desirability of a proposed course of rehabilitative treatment. The cost and fitting of a prosthetic device following a mastectomy is included within the type of coverage required under this section.