Michigan Compiled Laws, Chapter 600. Revised Judicature Act of 1961 § 600.5838a

Sec. 5838a. (1) For purposes of this act, a claim based on the medical malpractice of a person or entity who is or who holds himself or herself out to be a licensed health care professional, licensed health facility or agency, or an employee or agent of a licensed health facility or agency who is engaging in or otherwise assisting in medical care and treatment, whether or not the licensed health care professional, licensed health facility or agency, or their employee or agent is engaged in the practice of the health profession in a sole proprietorship, partnership, professional corporation, or other business entity, accrues at the time of the act or omission that is the basis for the claim of medical malpractice, regardless of the time the plaintiff discovers or otherwise has knowledge of the claim. As used in this subsection:

(2) Except as otherwise provided in this subsection, an action involving a claim based on medical malpractice may be commenced at any time within the applicable period prescribed in section 5805  1 or sections 5851 to 5856,  2 or within 6 months after the plaintiff discovers or should have discovered the existence of the claim, whichever is later. However, except as otherwise provided in section 5851(7) or (8), the claim shall not be commenced later than 6 years after the date of the act or omission that is the basis for the claim. The burden of proving that the plaintiff, as a result of physical discomfort, appearance, condition, or otherwise, neither discovered nor should have discovered the existence of the claim at least 6 months before the expiration of the period otherwise applicable to the claim is on the plaintiff. A medical malpractice action that is not commenced within the time prescribed by this subsection is barred.This subsection does not apply, and the plaintiff is subject to the period of limitations set forth in subsection (3), under 1 of the following circumstances:

(3) An action involving a claim based on medical malpractice under circumstances described in subsection (2)(a) or (b) may be commenced at any time within the applicable period prescribed in section 5805 or sections 5851 to 5856, or within 6 months after the plaintiff discovers or should have discovered the existence of the claim, whichever is later. The burden of proving that the plaintiff, as a result of physical discomfort, appearance, condition or otherwise, neither discovered nor should have discovered the existence of the claim at least 6 months before the expiration of the period otherwise applicable to the claim is on the plaintiff. A medical malpractice action that is not commenced within the time prescribed by this subsection is barred.