Written by A traumatic brain injury doesn’t always show up the way a broken arm does. Someone can walk away from a crash on the Kennedy Expressway looking fine, then spend the next six months relearning how to hold a conversation.
That gap between how an injury looks and what it actually does is a big part of why TBI claims get contested so hard by insurers.
What Counts as a Traumatic Brain Injury
A TBI happens when a sudden jolt, blow, or penetrating object disrupts normal brain function. Doctors grade severity from mild, a concussion, technically, to severe, based on how long someone loses consciousness and how much memory of the event survives.
Mild doesn’t mean minor. A driver who never blacks out can still have permanent attention and memory problems from a concussion that never shows up on a standard CT scan.
Open Versus Closed Head Injuries
Doctors split TBIs into two broad categories, and the distinction matters for both treatment and how a claim gets valued.
Open (Penetrating) Injuries
An open injury means the skull is breached, by broken glass, a piece of the dashboard, debris thrown up from the road. These wounds bleed heavily because the scalp is full of blood vessels, which makes them look worse than they sometimes are, and just as often, worse than they first appear.
Gunshot and stab wounds are the textbook examples, but in a car accident the more common mechanism is a shattered window or a piece of trim driven into the skull on impact. Every open head injury is a trauma-center emergency. Full stop.
Closed Head Injuries
Closed injuries are the harder ones to catch. No penetration, sometimes no visible mark at all, just the brain slamming against the inside of the skull from sudden deceleration.
Five patterns show up again and again in car-crash cases:
- Concussion. The mildest form, but “mild” is a medical label, not a promise about recovery time.
- Contusion. Bruising of the brain tissue itself, with localized swelling and bleeding.
- Diffuse axonal injury. Rotational force tears nerve fibers throughout the brain rather than in one spot, the mechanism behind the worst outcomes, including coma and persistent vegetative state.
- Coup-contrecoup injury. The brain hits the skull at the point of impact, then rebounds and hits the opposite side. Rapid deceleration crashes produce this almost by definition.
- Hematoma. A blood clot forming inside the skull, which can compress the brain and turn fatal within hours if it’s missed.
Brain swelling, or edema, can follow any of these, and often does more damage than the original impact, pressure builds inside a skull that has nowhere to expand.
What Causes These Injuries on Chicago Roads
Most TBI cases we see trace back to one of a handful of mechanisms.
Motor vehicle collisions are a leading cause among adults, and Chicago’s mix of expressway speeds and dense downtown intersections produces both kinds of crash that cause TBIs: high-speed rear-end and highway collisions on routes like the Dan Ryan, Kennedy, and Eisenhower, and low-speed T-bone and pedestrian strikes at Loop and neighborhood intersections where sightlines get blocked by parked cars, delivery trucks, or construction, a near-constant fixture on Chicago streets for a good chunk of the year.
Falls are the single leading cause of TBI overall, particularly for older adults and young children, and they matter here too. A rideshare passenger who slips getting out of a car, or a pedestrian knocked down and then striking their head on the curb, both fall inside a car-accident claim even though “fall” is the immediate mechanism of the head injury.
Contact sports, workplace incidents, and violence round out the list, but they’re outside the scope of what we handle in an auto claim unless a car crash was the underlying event, a delivery driver rear-ended while working, for instance.
The Injury Doesn’t End at the ER
The physical symptoms get the most attention early on: headaches, dizziness, fatigue, blurred vision, ringing in the ears, sometimes weakness or paralysis on one side. Those are the easy ones to document because a doctor can measure them.
The cognitive effects are harder to prove, and they often matter more to a case’s value. Memory gaps. Trouble multitasking. A slower processing speed that makes a job someone did for fifteen years suddenly exhausting. Language and word-finding problems that make a competent professional sound confused mid-sentence.
Then there’s the emotional side, mood swings, irritability, new anxiety or depression, impulsivity that wasn’t there before the crash. Families often notice this before the injured person does. Some TBI survivors go on to develop PTSD layered on top of the physical injury, and Illinois law recognizes anxiety and emotional damages as compensable alongside the physical harm.
Existing depression before the crash doesn’t disqualify a claim. It can complicate recovery, depression affects attention and motivation, which slows rehabilitation, and that complication is exactly the kind of thing an insurer will try to use against you rather than account for.
Illinois Law and What It Means for a TBI Claim
A few rules do most of the work in a Chicago traumatic brain injury case.
The statute of limitations. Under 735 ILCS 5/13-202, you generally have two years from the date of the crash to file a personal injury lawsuit in Illinois. Miss it, and the claim is gone regardless of how strong the medical evidence is. There’s an exception for minors, 735 ILCS 5/13-211 tolls the clock until a minor turns 18, then gives two more years, but adults don’t get that grace period.
Comparative negligence. Illinois follows a modified comparative fault rule under 735 ILCS 5/2-1116. If you’re found more than 50% at fault for the crash, you recover nothing. Below that threshold, your damages are reduced by your percentage of fault, a $500,000 verdict with 20% fault assigned to you pays out $400,000. Insurers know this and routinely try to inflate a claimant’s share of fault specifically to push it toward that 51% cutoff.
Capacity to sue. A severe TBI can leave someone legally unable to manage their own affairs. When that happens, Illinois probate law (755 ILCS 5/11a-3) allows a court to appoint a guardian, often a family member, to pursue the injury claim and manage any settlement on the injured person’s behalf. This step gets missed more often than it should, and it can stall a case for months if it isn’t set up early.
Underinsured motorist coverage. Severe TBI cases often exceed the at-fault driver’s policy limits. Illinois only requires $25,000 in minimum liability coverage, which doesn’t come close to covering a single ICU stay. When that happens, your own underinsured motorist coverage, if you carry it, becomes the real source of recovery, and pursuing it is a claim against your own insurer, not the other driver’s.
What a TBI Claim Is Actually Worth
Two categories make up the damages in a TBI case: economic and non-economic.
Economic damages are the countable ones, emergency care, hospitalization, surgery, every session of physical, occupational, speech, and cognitive therapy, plus lost wages and, for severe cases, lost future earning capacity if the injury limits what kind of work someone can do for the rest of their life.
Non-economic damages cover pain and suffering, loss of normal life, and the disruption to relationships that comes with a personality change or a marriage strained by months of irritability nobody saw coming. These are harder to attach a number to, and they’re where experienced representation makes the biggest difference in the final settlement.
If more than one party shares fault, a distracted driver and a municipality that left a traffic signal broken, for example, Illinois joint and several liability rules under 735 ILCS 5/2-1117 determine how the recovery gets split among the defendants found liable.
Why Insurers Dispute These Injuries
Insurance adjusters routinely downplay TBI claims, especially mild-to-moderate ones. No visible wound. A CT scan that comes back “normal.” A police report that lists the driver as “no apparent injury” at the scene, because a loss of consciousness that lasted ninety seconds isn’t always obvious to a responding officer.
That gap between “looked fine at the scene” and “can’t hold a job three months later” is exactly what adjusters exploit. They’ll point to normal imaging and argue the symptoms are unrelated, pre-existing, or exaggerated.
Neuropsychological testing closes that gap. It measures processing speed, memory, and executive function against population norms, numbers an adjuster can’t dismiss the way they dismiss a claimant’s own account of “I just don’t feel right.”
Insurers also frequently demand an independent medical examination, performed by a doctor the insurance company selects and pays for. Despite the name, an IME doctor works for the insurer, not for you, and IME reports have a well-documented pattern of finding injuries less severe than the treating physicians who’ve actually managed the case over months. You’re not required to treat an IME doctor’s conclusions as final, and a lawyer can push back on findings that don’t match the rest of the medical record.
Treatment: What a TBI Claim Has to Account For
Severe cases sometimes require surgery, a craniotomy to relieve pressure or remove a hematoma, skull fracture repair, or invasive monitoring of intracranial pressure in the ICU. These are the injuries that generate six-figure medical bills before rehabilitation even starts.
Most TBIs are managed without surgery: close observation, medication to control swelling or prevent seizures, and, this is the part that runs for months or years, rehabilitation. Physical therapy for motor function. Occupational therapy to relearn daily tasks. Speech therapy for communication and swallowing. Cognitive rehabilitation for memory and problem-solving. Psychological counseling, often structured psychotherapy, for the depression and anxiety that frequently follow.
Recovery timelines vary enormously by severity. A single concussion typically resolves within a few weeks to a few months. Moderate to severe TBIs can mean a year or more of active rehabilitation, and some deficits, particularly cognitive ones, never fully resolve. That timeline matters for a claim, because settling too early, before the real recovery trajectory is clear, routinely undervalues what the injury actually costs someone over a lifetime.
Severe TBIs also generate a cost that’s easy to miss on a medical bill: caregiving. A family member cutting back work hours to manage appointments, medication schedules, and basic supervision is a real economic loss, and Illinois law allows that kind of loss-of-services claim to be factored into a case, not just the injured person’s own lost wages.
How a Brain Injury Lawyer Builds the Claim
The first step is unglamorous: our brain injury lawyers pull every medical record, the police report, and any available scene evidence to establish what actually happened and how severe the injury really is. TBIs are notoriously underdiagnosed at the first ER visit, so early records often understate the injury compared to what shows up weeks later.
Timing matters more than most people realize. Evidence at the scene disappears fast, skid marks fade, dashcam footage gets overwritten, witnesses’ memories drift. Starting the investigation within the first few weeks, while records are still being generated and the picture of the injury is still forming, gives a lawyer far more to work with than starting six months in.
From there, the case usually turns on expert testimony. Neurologists, neuropsychologists, and vocational experts translate “I have trouble concentrating” into a documented, dollar-figure impact on someone’s ability to work, testimony insurance adjusters can’t wave away the way they can a claimant’s own description of symptoms.
Most cases settle. Negotiation with the insurer covers medical expenses, lost wages, pain and suffering, and future care costs, and a lawyer who has valued TBI cases before knows what a fair settlement number actually looks like for a given severity level. When an insurer won’t move, the alternative is filing suit and preparing for trial, depositions, expert reports, and eventually a jury if it comes to that.
Frequently Asked Questions
What counts as a severe TBI after a car accident?
Severe TBIs involve significant trauma to the brain from impact or penetration, and typically produce extended loss of consciousness, amnesia around the event, or lasting cognitive and physical impairment rather than symptoms that resolve within days.
Will a normal CT scan mean I don’t have a real brain injury?
No. Many concussions, and even some more serious TBIs, don’t show up on a standard CT scan, which is built to catch bleeding and fractures rather than the microscopic damage behind cognitive symptoms. Neuropsychological testing is often what actually documents the injury.
Can I still file a claim if I didn’t go to the hospital right after the accident?
Yes, though it’s harder. TBI symptoms are frequently delayed, and insurers use a gap between the crash and treatment to argue the injury isn’t related. Getting evaluated as soon as symptoms appear, and telling the doctor about the crash, helps close that gap.
Do I need a guardian to bring a claim if a family member can’t manage their own affairs after a TBI?
If the injury leaves someone unable to handle decisions or finances, Illinois probate court can appoint a guardian to pursue the claim and manage a settlement on their behalf under 755 ILCS 5/11a-3. It’s worth raising with a lawyer early, rather than after a settlement offer is already on the table.
How long do I have to file a claim in Illinois?
Two years from the date of the accident in most cases, under 735 ILCS 5/13-202. Minors get the clock tolled until they turn 18.
What is my TBI claim worth?
It depends on injury severity, the amount of future care needed, and your degree of lost earning capacity. There’s no fixed number, and any online calculator promising one is guessing. A case evaluation with actual medical records behind it is the only way to get a realistic figure.
Does a TBI claim include compensation for a family caregiver’s lost income?
It can. If a spouse or family member reduces work hours to provide care, that loss-of-services impact is a real economic cost that belongs in the damages calculation alongside the injured person’s own medical bills and lost wages.
If You’re Dealing With a TBI From a Chicago Car Accident
An ER visit that seemed routine, then a follow-up months later when the real extent of the injury becomes clear, is a common pattern with TBI cases. Our personal injury team builds these cases around the medical reality of the injury, not just the initial police report.
Free consultation. No fee unless we recover for you. Contact us to talk through what happened.
More Illinois Injury Guides
- Common Brain Injuries By Car Accidents
- Best Brain Injury and TBI Lawyers in Chicago
- Traumatic Brain Injury Claims in Chicago: Symptoms, Treatment, and Compensation
- Brain Injury Claims in Chicago
Attorney Advertising. This page provides general information about Illinois law and is not legal advice. Reading it does not create an attorney-client relationship. Deadlines and outcomes depend on the specific facts of your case — speak to a licensed Illinois attorney about your situation. Contingency fees cover legal fees only. Clients may remain responsible for case costs and expenses such as filing fees, expert witnesses, and medical records.
