Brain Injury Lawyer
California

The Centers for Disease Control classifies TBI by severity using the Glasgow Coma Scale (GCS), duration of loss of consciousness (LOC), and duration of post-traumatic amnesia (PTA). Understanding the classification matters because it directly affects both the medical prognosis and the litigation strategy.

Mild TBI — Concussion

Mild TBI is the most common and the most frequently undervalued by insurance companies. Diagnostic criteria include: a GCS score of 13–15, loss of consciousness of 30 minutes or less or no loss of consciousness at all, post-traumatic amnesia of 24 hours or less, and any alteration in mental status — confusion, disorientation, feeling dazed — at the time of injury. A CT scan is normal in the vast majority of mild TBI cases, which insurance adjusters exploit to minimize the claim.

The problem: mild TBI can produce post-concussion syndrome — persistent headaches, cognitive difficulties (memory, concentration, processing speed), mood changes, sleep disturbance, sensitivity to light and noise — that lasts months to years and significantly impairs the ability to work. MRI with diffusion tensor imaging (DTI) and neuropsychological testing are more sensitive than CT for diagnosing the functional deficits of mild TBI.

Moderate TBI

Moderate TBI involves a GCS score of 9–12, loss of consciousness from 30 minutes to 24 hours, and post-traumatic amnesia of 1–7 days. Structural brain abnormalities visible on CT or MRI are common. Recovery is typically incomplete, with residual cognitive, behavioral, or physical deficits that affect work capacity and quality of life long-term.

Severe TBI

Severe TBI involves a GCS score of 3–8, loss of consciousness greater than 24 hours, and post-traumatic amnesia greater than 7 days. Structural damage is typically visible on imaging. Permanent cognitive impairment, physical disability, and the need for supervised care or institutional placement are common outcomes. These cases produce the highest damage values in California personal injury litigation — routinely in the $2 million to $20 million range when the full lifetime cost of care is properly calculated.

California imposes no cap on economic or non-economic damages in TBI cases outside of medical malpractice. Under Civil Code § 3333, the plaintiff is entitled to all damages proximately caused by the defendant's negligence. In severe TBI cases, that number is often measured in millions.

Economic Damages — The Largest Component

Past medical expenses are the baseline — every treatment, hospitalization, surgery, rehabilitation session, medication, and medical device from the date of injury through the date of settlement or verdict. Future medical expenses are where severe TBI cases generate their highest values. A life care plan — prepared by a certified life care planner working with the treating physicians — projects the comprehensive cost of all future medical treatment, therapy, medications, equipment, and supervision over the plaintiff's expected lifetime.

For a 35-year-old with severe TBI requiring 24-hour supervised care, the lifetime cost of care can exceed $5 million to $10 million depending on current and projected care costs, the plaintiff's life expectancy, and the appropriate discount rate applied to future costs. These numbers are calculated and presented by forensic economists — not estimated by the treating physician.

Lost wages and loss of future earning capacity are separate economic damage components. If TBI permanently prevents the plaintiff from returning to their prior occupation — or reduces their earning capacity — a forensic economist calculates the present value of that lost income stream over the plaintiff's expected working life, typically to age 67.

Non-Economic Damages — Uncapped

Pain and suffering, loss of enjoyment of life, emotional distress, and the loss of cognitive abilities that defined the plaintiff's identity before the injury — these non-economic damages are uncapped in California TBI cases and represent a significant portion of the total damages in moderate and severe TBI cases. Presenting these damages effectively requires medical evidence of the specific functional deficits and testimony about what the plaintiff could do before the injury and cannot do after.

Typical Value Ranges by TBI Severity

These ranges are illustrative. Actual case value depends entirely on the specific facts, evidence, expert opinions, and available insurance.

The leading causes of traumatic brain injury in California personal injury litigation include motor vehicle accidents — responsible for the largest share of severe TBI cases — as well as falls, assaults, and sports-related injuries. The cause of injury determines the defendant, the applicable legal theory, the available insurance, and the evidentiary requirements.

• Motor vehicle accidents: The leading cause of TBI in litigation. High-speed collisions, rollover accidents, pedestrian and bicycle accidents, and motorcycle crashes produce the highest-severity TBI cases. The forces involved in a 50-mph collision transmit through the skull to the brain regardless of visible head injury.
• Falls: The leading cause of TBI hospitalizations nationally. Slip-and-fall cases on commercial property, falls from heights in construction, and stairway falls in residential or commercial buildings are the most litigated.
• Workplace accidents: Construction falls, equipment accidents, and industrial explosions. Workers' compensation typically applies, but third-party liability claims against contractors, equipment manufacturers, or property owners are often available outside the workers' comp system.
• Sports and recreation: Contact sports, helmet-sport accidents, and water-related accidents. Product liability theories apply when defective helmets or protective equipment contributed to the injury.
• Medical negligence: Surgical complications, anesthesia errors, and stroke caused by delayed diagnosis can produce TBI with separate damages frameworks under MICRA's modified damages rules.

TBI litigation differs from most personal injury cases in its absolute dependence on a coordinated expert infrastructure. The complexity of the medicine, the magnitude of the future damages, and the sophistication of the insurance defense in high-value cases require experts across several disciplines.

Medical Experts

A neurologist or neurosurgeon establishes the diagnosis, links it causally to the accident mechanism, and projects the future course of the injury and treatment needs. A neuropsychologist administers standardized cognitive testing — measuring memory, attention, processing speed, executive function, and other domains — to document the functional deficits the TBI produced and distinguish them from pre-existing conditions.

Life Care Planner

A certified life care planner — typically a nurse with specialized training in catastrophic injury cost projection — works with the treating physicians to produce a comprehensive life care plan: a line-item projection of every medical service, therapy session, medication, medical equipment, home modification, and care supervision need the plaintiff will require for the rest of their life, priced at current and projected market rates.

Forensic Economist

A forensic economist takes the life care plan and the plaintiff's employment history and converts them into present-value calculations: what is the lump sum today that, invested at an appropriate rate, would cover all projected future costs and lost income over the plaintiff's lifetime? This calculation is the foundation of the economic damages presentation and the number the insurance company's actuaries will analyze when evaluating settlement.