What it is
TBI is categorized by the Glasgow Coma Scale (GCS) into three severity levels. Mild TBI / concussion (GCS 13-15) is by far the most common — typically presenting with brief loss of consciousness, confusion, headache, dizziness, and memory disturbance. Standard CT imaging is usually normal in mild TBI, which is why the injury is so often missed. Moderate TBI (GCS 9-12) involves loss of consciousness from minutes to hours, persistent confusion, and often visible imaging findings (contusions, small hemorrhages). Severe TBI (GCS 3-8) involves prolonged unconsciousness or coma, often with major imaging findings and lifelong consequences. Symptoms can be physical (headaches, dizziness, fatigue, sleep disturbance), cognitive (memory loss, attention problems, slowed processing, executive function deficits), and emotional/behavioral (depression, anxiety, irritability, personality changes). Symptoms often DEVELOP or worsen over weeks after the initial injury, which is part of why timing of treatment and documentation matters so much. Post-concussion syndrome refers to persistent symptoms lasting beyond the typical 3-6 month recovery window.
How it works in practice
A claimant who hits their head in an accident — even without losing consciousness — should be evaluated promptly by a physician for possible TBI. Standard ER workup includes a neurological exam and CT scan to rule out bleeding or skull fracture. The CT is typically normal in mild TBI; this normal finding does NOT rule out TBI. The next-level workup includes neuropsychological testing (typically 4-8 hours of cognitive testing by a licensed neuropsychologist) that can objectively document cognitive deficits, an MRI with TBI-specific protocols (DTI, susceptibility-weighted imaging) that can show damage invisible on standard MRI, and longitudinal symptom tracking over months. The treating providers can include a neurologist, neuropsychologist, vestibular therapist (for dizziness), and speech-language pathologist (for cognitive rehabilitation). Defense IMEs in TBI cases frequently attribute symptoms to "anxiety," "malingering," "pre-existing depression," or "litigation neurosis" — characterizations that experienced TBI attorneys are well-prepared to counter with neuropsychological data, longitudinal records, and qualified expert testimony.
How Traumatic Brain Injury (TBI) affects your settlement
TBI is the personal injury world's biggest "iceberg" — what shows in initial documentation is a small fraction of what's actually there, and the gap between an undiagnosed-TBI settlement and a properly diagnosed-TBI settlement is typically 5-10x or more. A car-accident claim with whiplash and "headaches" that resolves into a chronic post-concussion syndrome typically settles for $15,000-$40,000 if treated as a soft-tissue case. The same underlying injury, properly worked up with neuropsych testing demonstrating attention/memory deficits, advanced MRI showing white-matter changes, and an explicit TBI diagnosis from a neurologist, typically settles for $100,000-$500,000+. The driver is not just the medical diagnosis but the cascading damages categories it unlocks: future medical costs (ongoing neurological monitoring, cognitive rehabilitation), loss of earning capacity (especially for cognitively demanding work), loss of consortium (TBI symptoms strain marriages substantially), and significantly elevated pain-and-suffering multipliers (3-5x rather than 1.5-2.5x). Three concrete moves: (1) any claimant with head impact or loss-of-consciousness symptoms should request a referral to a neurologist or TBI specialist — do not let primary-care providers minimize "concussion" symptoms; (2) request neuropsychological testing if symptoms include memory, attention, or executive function complaints — the test results provide OBJECTIVE evidence to counter defense "malingering" arguments; (3) request MRI with TBI-specific protocols (not just standard MRI), which can show injury invisible on routine imaging. Catastrophic TBI cases routinely settle for $1-10M+ with proper life care planning.
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Related glossary terms
Informational only and not legal advice. Settlement-dollar implications described here reflect typical patterns and may differ in any specific case. Confirm the analysis for your situation with a licensed attorney.