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Traumatic Brain Injury (TBI) Claims in Illinois

A traumatic brain injury claim in Illinois requires proof of three things. You must show what happened, how severe the injury is, and what it costs to live with the consequences. Each question requires its own evidence.

Diagnostic imaging and neuropsychological testing establish severity and prognosis. Treating-physician testimony plus expert disclosures translate the medical record into causation. They also project future care needs. Forensic-economist and life-care-planner testimony convert medical projections into present-value damages numbers. The jury can adopt those numbers.

Illinois law gives you two years from the date of injury. That is the deadline to file most personal-injury claims.

What is a traumatic brain injury under Illinois law?

A traumatic brain injury is physical damage to the brain caused by external force. That force can be a blow, a jolt, penetration, or rapid acceleration-deceleration. The force disrupts normal brain function.

Illinois courts recognize TBI claims across a spectrum. Cases range from mild concussion to severe diffuse axonal injury and intracranial hemorrhage.

The legal framework is the same negligence structure that governs any personal-injury case. The elements are duty, breach, causation, and damages. The defendant owed a duty of care and breached that duty. The breach caused the injury. The plaintiff sustained compensable damages.

Illinois follows modified comparative fault with a more-than-50% bar under 735 ILCS 5/2-1116. If the jury finds the plaintiff 50% or less at fault, damages are reduced by the plaintiff’s percentage. If the plaintiff is more than 50% at fault, the plaintiff recovers nothing.

TBI cases Parker & Parker handles arise from several contexts. Motor-vehicle crashes are common, especially commercial-vehicle crashes where impact severity skews higher. Falls from height in construction or premises-liability contexts also cause TBI. Sports and recreational injuries, assault and battery, and defective product cases can result in brain injury. Medical malpractice can cause TBI through failure to diagnose stroke, anesthesia errors, or birth-injury hypoxic events.

Each context has its own liability-evidence framework. But the TBI damages presentation is similar.

How long do I have to file a TBI claim in Illinois?

Two years from the date of the injury for most personal-injury TBI claims. That deadline is set by 735 ILCS 5/13-202.

Tolling can apply for minors under 735 ILCS 5/13-211. Claims involving local public entities or employees may have a one-year period. That shorter deadline is set by 745 ILCS 10/8-101. State or federal defendants require separate analysis.

Fatal-TBI cases generally run two years from the date of death. That deadline is set by 740 ILCS 180/2(d). Medical-malpractice TBI cases run on the 735 ILCS 5/13-212 framework. That is a two-year-discovery, four-year-repose structure.

What evidence proves a traumatic brain injury in court?

The TBI evidentiary effort runs across five layers. You need imaging, neuropsychology, treating-physician testimony, expert disclosures, and lay-witness testimony. Each layer contributes a different piece.

Diagnostic imaging: CT scan is often the acute-care first-line imaging study. Clinicians use it to evaluate suspected intracranial injury. It can identify skull fractures, intracranial hemorrhage, and large contusions.

MRI is more sensitive for some diffuse axonal injuries. It also detects smaller contusions and structural findings that CT may miss.

Diffusion Tensor Imaging (DTI) and PET imaging are advanced modalities. They are sometimes used in TBI litigation to address microstructural or metabolic findings. Conventional imaging may not show those findings. Their admissibility and weight depend on the expert foundation, the case facts, and the trial court’s evidentiary rulings.

Neuropsychological testing: A formal neuropsychological battery establishes baseline cognitive function. A licensed neuropsychologist administers the battery. It tests attention, memory, executive function, processing speed, language, and visuospatial domains.

Comparison against age-and-education-adjusted norms produces a profile of impairment. Repeat testing at intervals tracks recovery or persistent deficit. Neuropsychological testimony is foundational to mild and moderate TBI cases. In those cases, imaging is often normal or equivocal.

Treating-physician records: The acute-care record from the trauma center is primary medical evidence. The longitudinal record from neurology, neuropsychology, rehabilitation medicine, and physiatry is also primary evidence.

Treating physicians testify to causation and prognosis under their treating-physician role. Depending on the case, treating physicians may also be disclosed as Rule 213(f) experts. That allows them to opine beyond pure treating observations.

Rule 213(f) expert disclosures: Plaintiff expert disclosures in a TBI case typically include several specialists. You need neurology, neuropsychology, and physiatry. In severe cases, you also need neurosurgery. You also need a forensic economist and life-care planner.

Defense disclosures usually include a defense neuropsychologist for an Independent Medical Examination. They also include a defense neurologist and economist rebuttals.

Lay-witness testimony: Family, co-workers, and friends testify to pre-injury and post-injury function. They describe what the plaintiff used to be able to do. They describe what the plaintiff can’t do now. They describe behavioral changes like irritability, fatigue, social withdrawal, and executive-function impairment. Those changes don’t show on imaging or testing.

Lay testimony is critical in mild-TBI cases where imaging is normal.

What if my brain injury didn’t show on imaging?

Imaging that comes back normal is common in mild TBI and post-concussion cases. The medical-legal effort moves to other evidence. You use neuropsychological testing, treating-physician observation, and advanced imaging where available. DTI and PET are examples of advanced imaging. You also use lay-witness testimony to functional change.

Illinois courts allow compensation for brain injury when expert testimony establishes “substantial evidence of probative value” for the injury claim. Expert testimony stating a plaintiff “probably” has a brain injury can be sufficient. Testimony that the plaintiff “possibly” could suffer future complications can also be sufficient under Illinois case law.

Courts may allow compensation for “increased likelihood of future complications” if supported by substantial evidence.

Defense arguments to anticipate in mild-TBI cases include several claims. Defense may claim lack of “objective” evidence. They may argue that unconsciousness is a prerequisite to brain injury. They may claim that short unconsciousness duration means minimal injury. They may raise “compensation neurosis” arguments for delayed symptoms.

The evidentiary response is neuropsychological testing, treating-physician testimony, and lay-witness testimony to functional change.

See the Proving Invisible Brain Injuries in Illinois page for the focused workup on cases where imaging doesn’t establish the injury.

What if a pre-existing condition contributed to my brain injury?

Illinois follows the eggshell-plaintiff doctrine. A defendant takes the plaintiff as the defendant finds the plaintiff. Pre-existing conditions don’t bar recovery. They affect comparative analysis of damages attributable to the new injury.

Documented pre-and-post functional comparison establishes the change the new injury produced. You use medical records, employment records, and family testimony.

A pre-existing brain condition that’s aggravated by trauma is compensable. You recover to the extent of the aggravation. Pre-existing concussions, prior head injuries, or developmental conditions don’t bar recovery. They affect the comparative analysis of damages attributable to the new injury.

What damages can I recover in an Illinois TBI case?

Illinois Pattern Jury Instructions for Civil Cases govern the damages presentation. The categories that typically apply in a TBI case:

  • Pain and Suffering, Past and Future (IPI 30.05)
  • Medical Expense, Past and Future (IPI 30.06) — acute care, neuropsychological testing, rehabilitation, ongoing therapy, medication, and future-medical projections supported by treating-physician testimony and life-care planning
  • Disfigurement (IPI 30.04) — visible scarring or other disfigurement where the evidence supports it
  • Disability / Loss of a Normal Life (IPI 30.04.01) — cognitive, behavioral, and functional limitations that affect daily life
  • Lost Earnings, Past and Future (IPI 30.07) — including future earning-path proof where cognitive impairment affects career trajectory
  • Reduction to Present Cash Value (IPI 34.02) — for future medical expenses and future earnings; pain and suffering, disability, loss of normal life, and disfigurement are not reduced to present cash value

Illinois does not cap non-economic damages by statute. In catastrophic TBI cases the future-damages component typically exceeds past damages by an order of magnitude. Life-care planning that projects 30-60 years of future care produces damages numbers. Those numbers anchor settlement negotiations and trial verdicts.

How is future medical care projected in a TBI case?

Through three layers. First, treating-physician projection. Your neurologist, neuropsychologist, and physiatrist project ongoing care needs.

Second, certified life-care planning. A credentialed planner aggregates treating projections into a comprehensive future-care plan. The plan includes annualized costs over 30-60 years.

Third, forensic-economist reduction to present cash value under IPI 34.02. Pain and suffering, disability, and loss-of-normal-life damages are not reduced to present cash value.

The Illinois Supreme Court in Richardson v. Chapman approved the “total offset method” for determining present cash value. The court approved it in upper-bound plaintiff-expert figures. But it did not adopt that method as preferred over other methods. This provides strategic flexibility for plaintiff economic expert testimony.

How does the evidence plan change with the cause of injury?

The evidence plan changes with the cause of injury. A truck-crash TBI may require ECM/EDR data, dashcam video, and hours-of-service records. It may also require reconstruction testimony.

A premises-liability fall may turn on surveillance, lighting, and flooring condition. Prior incidents and maintenance records may also be key.

A medical-negligence brain injury may require expert review. You may need anesthesiology, stroke-care, radiology, or obstetrical expert review.

The injury presentation can look similar across cases. But the liability proof does not. That is why the intake phase identifies both the medical pathway and the event pathway. The firm does this before ordering experts or sending preservation letters.

Illinois recognizes a duty to preserve evidence in defined circumstances. Those circumstances include agreement, contract, statute, special circumstance, or voluntary undertaking. Boyd v. Travelers Insurance Co., 166 Ill. 2d 188 (1995), is the leading preservation case.

For TBI cases arising from motor-vehicle crashes, preservation letters cover several items. They cover ECM/EDR data, dashcam, in-cabin video, and surveillance.

For premises-liability TBI cases, preservation covers incident reports and surveillance. It also covers prior-incident records, inspection records, and contractor records.

Where are TBI cases filed in central Illinois?

TBI cases Parker & Parker handles are filed in the trial courts of three judicial circuits. The Tenth Judicial Circuit covers Peoria, Tazewell, Marshall, Putnam, and Stark Counties. The Eleventh Judicial Circuit covers McLean, Woodford, Logan, Ford, and Livingston Counties. The Ninth Judicial Circuit covers Knox, Fulton, Hancock, McDonough, and Warren Counties.

Acute-care intake on serious TBI cases in central Illinois typically passes through OSF Saint Francis Medical Center in Peoria. It is the region’s Level 1 trauma center with neurosurgery. Secondary intake occurs at OSF Saint Joseph Medical Center in Bloomington and Carle BroMenn Medical Center in Normal.

Specialized neurology, neuropsychology, and brain-injury rehabilitation services are available at OSF Illinois Neurological Institute in Peoria. They are also available through Carle Health’s neurology programs.

Records workflows differ across systems. Intake addresses records requests the same week the firm opens the file.

How much is a TBI case worth in Illinois?

Outcomes are case-specific. Value depends on injury severity, prognosis, and age and earning trajectory. It also depends on family structure. In fatal cases, loss-of-services and loss-of-society matter. Available coverage and the procedural posture at settlement also affect value.

The firm does not publish dollar averages. See the Case Results page for documented brain-injury outcomes.

Does it cost anything to start a TBI case?

No. Parker & Parker works on contingency. No fee unless we recover.

Investigation costs, expert fees, deposition transcripts, and litigation expenses are advanced by the firm. Expert fees include neurology, neuropsychology, forensic economist, and life-care planner. Those costs are reimbursed only out of the recovery.

Speak With a Peoria Brain Injury Attorney

Robert Parker personally handles every brain injury case Parker & Parker accepts. Initial consultation is free. The firm works on contingency: no fee unless we recover.

Office: 300 NE Perry Avenue, Peoria, IL 61603. Main line: (309) 673-0069.

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