Michigan Medical Malpractice: NOI & Affidavit of Merit (2026)

By Attorney Manny Chahal · Updated May 2026 · Reading time: ~9 min

Michigan medical malpractice claims live or die on two procedural documents most clients never hear about until it is too late: the 182-day Notice of Intent under MCL 600.2912b and the Affidavit of Merit under MCL 600.2912d. Miss either one, and a meritorious claim can be dismissed before a jury hears a word about the underlying care.

Why Michigan Medical Malpractice Procedure Is So Unforgiving

Michigan layered a pre-suit notice regime and an expert-affidavit requirement on top of an already-short two-year statute of limitations in the 1993 and 2004 tort-reform waves. The result is one of the most procedurally hostile medical malpractice frameworks in the country. Cases are routinely lost not on the medicine but on the calendar.

For Michigan injury victims and their families, that means timing decisions made in the first weeks after a bad outcome can determine whether the claim survives. The two-year clock starts ticking from the act or omission, not from discovery. The Notice of Intent must be served before suit is filed. The Affidavit of Merit must be filed with the complaint, signed by a qualifying expert. Each requirement carries its own traps.

Step One: The Two-Year Statute of Limitations

Under MCL 600.5805(8), a medical malpractice action must be commenced within two years of accrual. Under MCL 600.5838a, the claim accrues at the time of the act or omission — not when the patient learns about it.

The Six-Month Discovery Rule

The statute provides a limited safety valve. A claimant may file within six months after the plaintiff discovers or should have discovered the existence of the claim, whichever is later. The plaintiff carries the burden of proving the discovery date. Constructive knowledge — what a reasonable patient should have known — counts against the plaintiff.

The Six-Year Statute of Repose

MCL 600.5838a also imposes an absolute six-year deadline from the act or omission. Discovery within years five and six is fine. Discovery seven years after a retained surgical sponge can be barred regardless of when the patient learned the truth. Limited exceptions exist for fraudulent concealment and certain reproductive-organ injuries.

Step Two: The Notice of Intent (MCL 600.2912b)

Before filing suit, the plaintiff must serve a written Notice of Intent on each health professional and health facility named as a defendant. The notice period is generally 182 days. The complaint may not be filed until the 183rd day after service of the NOI — though it must still be filed before the two-year SOL expires.

Required Contents

The Notice of Intent must describe:

• The factual basis for the claim — what happened, when, and to whom.
• The applicable standard of practice or care for each named defendant.
• The manner in which it is claimed that the standard was breached by each defendant.
• The alleged action that should have been taken to comply with the standard.
• The manner in which the breach proximately caused the injury.
• The names of all health professionals and health facilities the claimant is notifying.

Tolling and the 2004 Amendments

Filing a good-faith NOI tolls the statute of limitations during the notice period. The Michigan Supreme Court confirmed in Bush v Shabahang, 484 Mich 156 (2009), that defective NOIs filed after the 2004 amendments are amendable under MCL 600.2301 so long as the plaintiff made a good-faith effort to comply with the content requirements. That ruling rescued countless claims from earlier, harsher case law.

The 154-Day Counter-Statement

The defendant has 154 days to respond with a counter-statement of facts and defenses. If no response arrives within 154 days, the plaintiff may file suit early — but only after the 154-day window closes. Similarly, if the defendant writes back early refusing to settle, the plaintiff may file before the 182 days run.

Step Three: The Affidavit of Merit (MCL 600.2912d)

Every Michigan medical malpractice complaint must be accompanied by an Affidavit of Merit signed by a health professional whom the plaintiff’s attorney reasonably believes qualifies as an expert under MCL 600.2169. The affidavit is not a pleading. It is an evidentiary prerequisite to filing.

Required Statements

The affidavit must certify that the expert has reviewed the NOI and the medical records, and must contain statements regarding:

• The applicable standard of practice or care.
• The expert’s opinion that the standard was breached.
• The actions that should have been taken or omitted to comply with the standard.
• The manner in which the breach proximately caused the injury alleged.

Boilerplate language will not save an affidavit. The expert must connect the opinion to the specific alleged acts of negligence and to causation in fact.

Expert Qualifications Under MCL 600.2169

The expert must match the defendant’s specialty. If the defendant is a board-certified specialist, the affiant must hold the same board certification. The affiant must have devoted a majority of professional time during the year preceding the alleged malpractice to either active clinical practice in the same specialty or to teaching students in an accredited program in the same specialty. Get this wrong and the affidavit fails.

Tolling and Presumption of Validity

Under Kirkaldy v Rim, 478 Mich 581 (2007), an Affidavit of Merit filed with the complaint is presumed valid. The statute of limitations is tolled when the complaint and affidavit are filed and served. That presumption can be challenged later, but the plaintiff is not required to defend the affidavit’s adequacy in the abstract before the period of limitations resumes.

The 2026 Damages Caps

Michigan does not cap economic damages such as past and future medical bills, lost wages, and earning capacity. But noneconomic damages — pain, suffering, loss of consortium, disfigurement — are limited under MCL 600.1483. The Michigan Department of Treasury adjusts the caps each year for inflation.

The enhanced cap applies only when the plaintiff suffers one of three catastrophic categories: hemiplegic, paraplegic, or quadriplegic injury with total permanent functional loss of one or more limbs; permanent impairment of cognitive capacity rendering the plaintiff incapable of independent life decisions or activities of daily living; or permanent loss of or damage to a reproductive organ resulting in inability to procreate.

How the Pieces Fit Together: A Compressed Timeline

Common Procedural Traps That Defeat Otherwise Strong Cases

• Filing too early. Filing the complaint on day 182 instead of day 183 has dismissed otherwise viable cases. Count to 183.
• Missing a defendant. Each physician and facility needs a separate NOI. Skipping the nurse anesthetist or the radiologist who read the imaging is a closed door later.
• Wrong-specialty affidavit. A general surgeon cannot vouch for an orthopedic surgeon’s standard of care under MCL 600.2169. Match the board certification.
• Discovery rule misapplied. The six-month discovery extension begins when the plaintiff discovers or should have discovered the claim. Constructive knowledge counts.
• Wrongful death overlay. Michigan wrongful death cases tied to alleged malpractice still require an NOI and AOM. The wrongful death savings statute under MCL 600.5852 interacts with these requirements but does not replace them.
• Repose trap. Children, incompetents, and adults all face the six-year repose ceiling outside narrow exceptions. The minor-savings statute does not extend the repose period for all categories.

Frequently Asked Questions