Michigan Compiled Laws, Chapter 600. Revised Judicature Act of 1961 § 600.2912e

Sec. 2912e. (1) In an action alleging medical malpractice, within 21 days after the plaintiff has filed an affidavit in compliance with section 2912d,  1 the defendant shall file an answer to the complaint. Subject to subsection (2), the defendant or, if the defendant is represented by an attorney, the defendant's attorney shall file, not later than 91 days after the plaintiff or the plaintiff's attorney serves the affidavit required under section 2912d, an affidavit of meritorious defense signed by a health professional who the defendant's attorney reasonably believes meets the requirements for an expert witness under section 2169.  2 The affidavit of meritorious defense shall certify that the health professional has reviewed the complaint and all medical records supplied to him or her by the defendant's attorney concerning the allegations contained in the complaint and shall contain a statement of each of the following:

(2) If the plaintiff in an action alleging medical malpractice fails to allow access to medical records as required under section 2912b(5),  3 the affidavit required under subsection (1) may be filed within 91 days after filing an answer to the complaint.