The Serious Impairment Threshold in Michigan

If you have been injured in a Michigan car accident and want to sue the at-fault driver for pain and suffering, you must first clear a legal hurdle that does not exist in most other states: the serious impairment of body function threshold. This requirement, codified in MCL 500.3135, is the gateway to pursuing a third-party auto claim for non-economic damages. Understanding how courts interpret this threshold is essential for any accident victim considering legal action.

The Statutory Definition: MCL 500.3135

Michigan's No-Fault Act restricts tort liability for auto accidents. Under MCL 500.3135(1), a person remains subject to tort liability for non-economic loss caused by their ownership, maintenance, or use of a motor vehicle only if the injured person has suffered death, serious impairment of body function, or permanent serious disfigurement.

The statute defines "serious impairment of body function" as an objectively manifested impairment of an important body function that affects the person's general ability to lead his or her normal life. This definition contains three distinct elements, each of which must be satisfied.

The Three-Prong Test

Following the Michigan Supreme Court's landmark decision in McCormick v Carrier, 487 Mich 180 (2010), courts evaluate the serious impairment threshold using a three-prong test:

Prong 1: Objectively Manifested

The impairment must be objectively manifested, meaning it must be evidenced by actual symptoms or conditions that someone other than the injured person can observe or perceive. This does not require the injury to be visible to the naked eye. Diagnostic imaging (MRIs, X-rays, CT scans), clinical examination findings, range-of-motion testing, and nerve conduction studies all constitute objective evidence.

What does NOT satisfy this prong: purely subjective complaints of pain without any supporting clinical or diagnostic findings. If your only evidence is your own testimony that you hurt, without corroborating medical documentation, you will likely fail to meet the threshold.

Prong 2: Important Body Function

The impairment must affect an "important body function." Michigan courts have interpreted this broadly. Virtually every body function can be considered important, including:

• Musculoskeletal functions (walking, bending, lifting, gripping)
• Neurological functions (cognition, memory, concentration)
• Respiratory and cardiovascular functions
• Reproductive functions
• Sensory functions (vision, hearing)
• Digestive and elimination functions

In practice, the second prong is rarely the battleground. Most legitimate injuries affect a body function that courts will recognize as important. The real disputes typically center on prongs one and three.

Prong 3: Affects General Ability to Lead Normal Life

This is the most contested element. The impairment must affect the person's "general ability to lead his or her normal life." The McCormick court clarified several critical points about this prong:

• The comparison is personal: Courts compare what the injured person can do now versus what they could do before the accident. The standard is their normal life, not some average person's life.
• It need not be permanent: A temporary impairment can meet the threshold if it is severe enough in its impact during its duration.
• It need not be total: You do not have to be completely unable to function. A significant limitation on your ability to do the things you normally did is sufficient.
• The course of the impairment matters: Courts consider the duration, extent, and nature of the impairment. A short-lived impairment is less likely to qualify than a long-lasting one.

McCormick v Carrier: The Defining Case

The 2010 Michigan Supreme Court decision in McCormick v Carrier fundamentally reshaped how the serious impairment threshold is evaluated. Before McCormick, the prevailing standard came from Kreiner v Fischer, 471 Mich 109 (2004), which applied a much stricter interpretation that was widely criticized for denying recovery to seriously injured people.

McCormick overruled Kreiner and held that:

• The threshold determination is inherently fact-specific and must be evaluated on a case-by-case basis
• Courts should not use a checklist approach or require any specific quantum of limitations
• The impairment does not need to be permanent to qualify
• Whether an impairment meets the threshold is generally a question for the jury, not the judge
• Summary disposition (dismissal before trial) should only be granted when there is no genuine factual dispute about whether the threshold is met

This ruling significantly opened the door for more injured people to have their claims heard by juries rather than being dismissed by judges on threshold grounds alone.

How Courts Apply the Threshold in Practice

Since McCormick, Michigan courts have provided further guidance through numerous published decisions. Some patterns emerge:

Cases that typically meet the threshold:

• Injuries requiring surgery (spinal fusion, knee replacement, rotator cuff repair)
• Fractures requiring extended immobilization or surgical fixation
• Traumatic brain injuries with documented cognitive deficits
• Herniated discs with radiculopathy confirmed by EMG/MRI
• Injuries preventing return to work for an extended period
• Conditions requiring ongoing pain management or physical therapy lasting many months

Cases that may struggle to meet the threshold:

• Soft tissue injuries that resolve within weeks
• Injuries with purely subjective pain complaints and normal imaging
• Conditions where the plaintiff's activities return to baseline quickly
• Pre-existing conditions that were not materially worsened by the accident

Building a Strong Threshold Case

Meeting the serious impairment threshold requires deliberate documentation from the very beginning of your case. Key strategies include:

1. Seek prompt medical treatment: Delays between the accident and treatment give insurers ammunition to argue your injuries are unrelated. Follow the steps in our guide on what to do after a car accident.
2. Follow through with prescribed treatment: Gaps in treatment suggest your injuries are not serious enough to affect your daily life.
3. Get diagnostic imaging: MRIs, X-rays, and CT scans provide the objective evidence needed for prong one.
4. Document lifestyle impact: Keep a journal of activities you can no longer do, tasks that cause pain, and ways your life has changed.
5. Be honest with your doctors: Tell them specifically what you cannot do. Their medical records become critical evidence.
6. Obtain specialist opinions: Referrals to orthopedic surgeons, neurologists, or pain management specialists carry more weight than general practitioner notes alone.

The Threshold as a Question of Law vs. Fact

One of the most significant aspects of post-McCormick law is that the threshold question is generally reserved for the jury. A defendant can still file a motion for summary disposition arguing that the plaintiff fails to meet the threshold as a matter of law, but courts are now far less inclined to grant such motions when any reasonable juror could find the threshold is met.

This means your case does not need to be bulletproof on the threshold issue to survive to trial. It needs to present genuine factual questions that a jury should decide. An experienced personal injury attorney will know how to frame your injuries and their impact to create those factual disputes.

Threshold Issues and Settlement Negotiations

The threshold also plays a major role in settlement negotiations. Insurance companies routinely deny claims by asserting the plaintiff does not meet the serious impairment standard. A strong threshold case, supported by objective medical evidence and detailed impact documentation, puts you in a far better negotiating position. Conversely, a weak threshold case gives the insurer leverage to offer a lowball settlement or nothing at all.

Understanding where your case falls on the threshold spectrum is one of the first things an attorney will evaluate during a consultation. This assessment drives strategy for your entire personal injury case timeline.