Mild TBI After a Michigan Car Accident: Why Insurance Companies Deny These Claims (and How to Fight Back)
The single most undervalued injury in Michigan auto litigation is the mild traumatic brain injury. The CT scan in the emergency room comes back "unremarkable." The patient is discharged the same evening with a diagnosis of "concussion" and a printed handout. Days later — sometimes weeks later — the headaches, the cognitive fog, the irritability, the inability to read for more than ten minutes without losing the thread, all begin. By the time those symptoms are documented and connected to the crash, the no-fault adjuster has already opened a file premised on the assumption that nothing serious happened.
This is the playbook insurance carriers run on mild TBI claims, and it works because most plaintiffs and most attorneys don't know how to disrupt it. This article walks through why mild TBIs get denied in Michigan, what the medical and legal record needs to look like to overcome those denials, and what you should be doing in the first 90 days after a crash to protect a claim that may be worth far more than anyone has yet told you.
What "Mild" TBI Actually Means — and Why the Word Is Misleading
The term "mild" comes from the Glasgow Coma Scale, a clinical scoring tool used in emergency medicine to rate the severity of an acute head injury. A GCS score of 13 to 15 at presentation classifies a TBI as mild. Most patients who walk into an ER after a car crash and score 14 or 15 are sent home with a concussion diagnosis. The diagnosis is medically accurate. The label "mild" is misleading, because GCS measures the acute presentation — not the long-term outcome.
Persistent post-concussion syndrome occurs in roughly 10 to 30 percent of mild TBI patients. The symptoms include chronic headaches, light and noise sensitivity, sleep disturbance, slowed processing speed, working-memory deficits, executive-function impairment, mood lability, depression, and anxiety. These symptoms can persist for months, years, or in some cases permanently. A 35-year-old engineer who scored 15 on the GCS in the ER but cannot return to her pre-injury cognitive workload twelve months later is, in every legally meaningful sense, severely impaired by her mild TBI.
Why Insurers Deny Mild TBI Claims in Michigan
Michigan's no-fault auto insurance system (MCL § 500.3101 et seq.) means that your own carrier pays your Personal Injury Protection (PIP) benefits — medical expenses, lost wages, replacement services — regardless of fault. But "pays" assumes the carrier accepts that the injury is real and that the treatment is reasonable and necessary. With mild TBI, that's where the fight starts. Adjusters and defense counsel deploy a recurring set of denial arguments:
- "The CT and MRI were normal, so there is no injury." Conventional imaging detects gross structural abnormalities — hemorrhage, contusion, edema. It does not reliably detect diffuse axonal injury, the microscopic shearing of white-matter tracts that produces the cognitive and emotional symptoms of mild TBI. A patient with a normal CT and a normal conventional MRI can still have measurable, objective deficits on neuropsychological testing and on diffusion tensor imaging (DTI). Carriers know this. They lean on the negative imaging anyway.
- "The symptoms are subjective." Headache, fatigue, brain fog, irritability — each of these can be argued to be self-reported, malingered, or overstated. The defense answer is to retain a neuropsychologist, administer validated cognitive testing, run effort and validity testing in parallel, and produce a report that documents impairment objectively against population norms.
- "The symptoms are explained by something else." Pre-existing depression. A prior concussion ten years earlier. ADHD. Stress at work. Sleep apnea. Adjusters and defense IMEs often hunt for any alternative explanation that allows them to disconnect symptoms from the crash.
- "The Michigan threshold isn't met." Under MCL § 500.3135, a third-party tort claim for non-economic damages requires a "serious impairment of body function" — an objectively manifested impairment of an important body function affecting the ability to lead a normal life. Carriers argue mild TBI doesn't clear that bar. Michigan case law disagrees, repeatedly, when the medical record is properly built.
- "Treatment is unreasonable or unnecessary." Cognitive rehabilitation, neuropsychological treatment, vestibular therapy — carriers cut these off, often at month three or four, by sending the file to a paid Independent Medical Examiner who declares maximum medical improvement has been reached.
What a Properly Built Mild TBI Claim Looks Like
The cases that overcome these denials and produce serious recoveries share specific medical-legal infrastructure. Each item below is a piece of that infrastructure.
- Same-day or next-day medical contact. An ER visit, an urgent care visit, or a call to a primary care physician within 24 hours of the crash, with a contemporaneously documented complaint of head impact, headache, dizziness, or altered mental status. This single fact is foundational. Cases without it are dramatically harder.
- Symptom diary from week one. Daily, dated, written log of headache severity, cognitive symptoms, sleep, mood. Patients who can later testify from contemporaneous notes are more credible than patients reconstructing symptoms from memory.
- Referral to a neurologist or neuropsychologist who specializes in mild TBI. Not a generalist. Mild TBI care has matured into a subspecialty. The right specialist documents the deficits, runs the right tests, and produces records that read as objective rather than advocacy.
- Neuropsychological battery within 6 to 12 weeks of the injury. A full neuropsych battery (memory, attention, processing speed, executive function, validity testing) administered by a board-certified neuropsychologist. The report should compare results to age- and education-adjusted norms and document any impairment objectively.
- Advanced imaging when indicated. Diffusion tensor imaging (DTI), susceptibility-weighted imaging (SWI), or volumetric MRI in cases where conventional imaging is normal but symptoms persist. Not every case warrants these. The ones that do benefit enormously from positive findings.
- Vocational and academic documentation. Performance reviews, sales numbers, school grades, missed work — anything contemporaneous that shows function before vs. function after. The single hardest argument for a defense to overcome is a documented decline in a quantifiable performance metric.
- A treating physician willing to articulate causation in writing. Many physicians treat the patient and decline to opine on causation. The cases that succeed are the ones where the treating neurologist or neuropsychologist will state, in writing, that the impairment is caused by the crash to a reasonable degree of medical probability.
Damages: What a Mild TBI Case Is Actually Worth
Mild TBI cases that resolve well in Michigan involve some combination of the following damages:
- PIP medical benefits for neurological evaluation, neuropsychological testing, cognitive rehabilitation, vestibular therapy, vision therapy, medication management, and — in cases of persistent symptoms — ongoing supportive care. Under the 2019 no-fault reform (MCL § 500.3107c), the coverage available depends on the level the policyholder elected. For unlimited PIP holders, this is meaningful. For $50,000-tier holders, it is not.
- Wage loss at 85 percent of gross income for up to three years (MCL § 500.3107).
- Replacement services at $20 per day for up to three years.
- Third-party non-economic damages against the at-fault driver under MCL § 500.3135 if the serious-impairment threshold is met. This is where seven-figure outcomes live: pain and suffering, loss of enjoyment of life, emotional distress, loss of consortium for a spouse.
- Lost earning capacity beyond the three-year PIP wage loss window, in cases where the cognitive deficits prevent return to pre-injury career trajectory. This is calculated by a vocational economist and projects the difference between pre-injury and post-injury lifetime earnings to present value.
Koussan Law's experience in this area includes a $1,850,000 settlement in a traumatic brain injury case arising from a Detroit stairwell premises liability claim — the same medical-legal architecture applies in auto cases. The factual contexts vary; the work to prove the brain injury and quantify its impact does not.
Five Things to Do in the First 90 Days After a Michigan Car Crash with a Possible Brain Injury
- Get evaluated, even if you feel fine. Head impact without immediate symptoms is not the same as head impact with no injury. Same-day medical contact establishes the connection between the crash and any symptom that develops in the following weeks.
- Tell every provider every symptom. If your headache is a 6/10, say so. If you can't focus on screens, say so. If you're sleeping poorly, say so. The medical record is built one note at a time, and absence of a complaint becomes "asymptomatic" in defense pleadings later.
- Apply for PIP benefits within one year. Under MCL § 500.3145, the deadline to file a PIP claim is one year from each individual loss. Failing to apply within the window forfeits those benefits permanently.
- Do not give a recorded statement to the other driver's insurer. Or to your own carrier without consulting counsel first. Recorded statements made when symptoms have not yet fully presented are routinely used to argue the injury was less significant than the medical record later shows.
- Talk to a Michigan personal injury attorney before week six. Not because the deadline is at week six — the third-party deadline is three years (MCL § 600.5805) — but because the medical-legal infrastructure described above takes time to build, and starting in week six produces a far stronger record than starting at month nine.
How Koussan Law Handles Michigan TBI Claims
We accept Michigan TBI claims on contingency — you pay nothing unless we recover. We front the cost of records retrieval, neuropsychological evaluation when indicated, advanced imaging review, and the expert testimony that builds these cases. Our experience includes a $1,850,000 traumatic brain injury settlement, a $14,950,000 medical-malpractice verdict, and a $6,000,000 premises liability settlement. The discipline that produces those numbers is the same discipline we apply to a mild TBI auto claim where the carrier has already taken the position that nothing serious happened.
If you have been in a Michigan car accident and are experiencing persistent headaches, cognitive symptoms, or any of the post-concussion symptoms described above, contact us for a free consultation. Request a consultation, use our free case calculator, or call (313) 800-0000. We will tell you, honestly, whether we think your case is being undervalued.
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Past results do not guarantee future outcomes. Every TBI case is fact-specific and depends on the medical record, the imaging, the neuropsychological testing, and qualified expert review. The terms of the $1.85 million settlement discussed in this article are confidential. This article is for general informational purposes only and is not legal advice. Reading this article does not create an attorney-client relationship with Koussan Law.
