Mich. Comp. Laws § 500.3406m

Sec. 3406m. (1) An insurer that delivers, issues for delivery, or renews in this state a health insurance policy that requires an insured to designate a participating primary care provider and provides for annual well-woman examinations and routine obstetrical and gynecologic services shall permit a female insured to access an obstetrician-gynecologist for annual well-woman examinations and routine obstetrical and gynecologic services. (2) An insurer shall not require prior authorization or referral for access under subsection (1) to an obstetrician-gynecologist who is participating with the insurer. An insurer may require prior authorization or referral for access to a nonparticipating obstetrician-gynecologist. (3) An insurer shall include a description of the coverage required under this section in a communication sent to the insured or group purchaser of coverage.