Mich. Comp. Laws § 500.3406w

Sec. 3406w. (1) Beginning on the effective date of the amendatory act that added this section, an insurer that delivers, issues for delivery, or renews in this state a health insurance policy that provides coverage for prescription drugs shall do both of the following: (a) Provide coverage for an emergency refill of up to a 60-day supply of any covered maintenance prescription drug. (b) Provide coverage for an early refill of any 30-day or 60-day covered maintenance prescription drug to allow for up to a 90-day supply, without regard to whether the pharmacy is mail order or in person. (2) This section does not apply after March 31, 2021. (3) As used in this section: (a) "Emergency refill" means a refill where, in the pharmacist's professional judgment, failure to refill the prescription may interrupt the patient's ongoing care and have a significant adverse effect on the patient's well-being as provided in section 17713 of the public health code, 1978 PA 368, MCL 333.17713. (b) "Maintenance prescription drug" means a prescription drug that meets the requirements under section 3406t(1)(b)(i) to (iii).