A brain injury can change how a person thinks, works, and relates to the people closest to them, sometimes long after the incident that caused it. If another party’s negligence may have contributed to that injury, California law may allow the injured person or their family to pursue compensation through an insurance claim or a brain injury lawsuit. At Vaksman Khalfin, PC, our California personal injury attorneys handle traumatic and acquired brain injury claims from our San Mateo office and deal with the insurers so families can focus on care.
This guide explains what a brain injury lawsuit is, how it differs from an insurance claim, what must generally be proven, which filing deadlines may apply, and what categories of damages California recognizes. If you are considering a claim, you can call our San Mateo office at 650-250-0705 or the firm line at 877-780-4727 for a free consultation.
What Is a Brain Injury Lawsuit?
A brain injury lawsuit is a civil case filed by someone who suffered a traumatic or acquired brain injury, asking a court to hold another party financially responsible for that harm. In California, these are generally negligence claims, and most must be filed within two years of the injury under Code of Civil Procedure section 335.1. Shorter deadlines can apply when a public entity or a health care provider is involved.
Key Takeaways
- A brain injury lawsuit is a negligence case: it asks whether another party failed to use reasonable care and whether that failure was a substantial factor in causing the injury.
- Most California injury lawsuits must be filed within two years of the injury, but claims involving a government entity or a health care provider follow different and often much shorter timelines.
- Symptoms of a brain injury can appear or worsen after the day of the incident, which is one reason early medical documentation matters to a claim.
- California recognizes both economic and non-economic damages, and being partly at fault reduces a recovery rather than barring it.
- Vaksman Khalfin, PC handles brain injury cases on a contingency-fee basis, with a free consultation. Call 650-250-0705.
Three Things to Know Before You File a Brain Injury Lawsuit
First, the deadline is not always two years. The standard California personal injury limitations period is two years, but a claim involving a city, county, transit agency, school district, or other public entity generally has to be presented to that entity under California’s Government Claims Act on a timeline much shorter than the general two-year period, and a claim based on a health care provider’s professional negligence follows its own timeline. Which rule applies depends on who may be responsible, which is often unclear early on.
Second, proof is medical as much as legal. Brain injury cases usually turn on records, imaging, treating-provider notes, and testimony that connect a specific incident to specific cognitive, behavioral, or physical changes. Gaps in early treatment records are one of the most common arguments insurers raise, so documentation created close in time to the incident tends to carry weight.
Third, the case may involve more than one responsible party. Depending on the facts, a driver, an employer, a property owner, a product manufacturer, or a public entity may each have a role. Identifying everyone who may be responsible early affects both the available insurance coverage and which deadlines apply.
Brain Injury Insurance Claim vs. Brain Injury Lawsuit
Most brain injury matters begin as an insurance claim. A lawsuit is a separate, formal step, and many claims resolve without one. The two differ in several ways:
| Insurance Claim | Brain Injury Lawsuit |
|---|---|
| Handled with an insurer or adjuster, outside of court | Filed in civil court and governed by court rules and deadlines |
| Evidence is largely what the parties exchange voluntarily | Formal discovery can compel records, depositions, and expert opinions |
| No filing deadline set by the court, though the underlying limitations period still runs | Must be filed before the applicable limitations period expires |
| Resolves by settlement or by the insurer denying the claim | Resolves by settlement, dismissal, or a decision at trial |
| Typically faster and less costly | Typically longer, with more procedural steps |
Filing a lawsuit does not end settlement discussions. Many cases continue to negotiate after filing, and some resolve well before trial.
Who May Be Responsible in a Brain Injury Case?
Responsibility depends entirely on the facts, and it is rarely obvious at the outset. Depending on how the injury happened, the parties who may have a role can include:
- A driver, and in some cases the employer of a driver acting within the scope of employment, in a car accident, motorcycle accident, bicycle accident, or pedestrian accident
- A trucking company or its contractors in a commercial truck accident
- A rideshare driver and, in some circumstances, the platform, in an Uber or Lyft accident
- A property owner or occupier when a dangerous condition contributed to a fall, as in a slip and fall claim
- A manufacturer, distributor, or retailer when a defective product such as a helmet, restraint system, or piece of equipment may have failed
- A public entity responsible for a roadway, sidewalk, transit vehicle, or public facility
- A health care provider, where the claim is one of professional negligence
Whether any of these parties is legally responsible is a question of evidence, not assumption. A lawyer can review what happened and explain which theories the facts may support.
What a Brain Injury Claim Generally Requires
Most California brain injury lawsuits are negligence claims. In general terms, an injured person must be able to show:
- Duty: the other party owed a duty to use reasonable care
- Breach: that party failed to use reasonable care
- Causation: that failure was a substantial factor in causing the injury
- Damages: the injury produced real losses that can be documented
Causation is often the most contested element in brain injury cases, particularly where imaging is unremarkable, where the injured person had a prior head injury, or where symptoms were first documented some time after the incident. These cases frequently rely on treating providers and retained experts to explain the connection between the event and the changes the injured person and their family describe.
Traumatic vs. Acquired Brain Injury
Brain injuries are commonly grouped into two broad categories. The distinction matters legally because it shapes which parties and which theories of liability may be involved.
| Traumatic Brain Injury (TBI) | Acquired Brain Injury (ABI) |
|---|---|
| Caused by an external force, such as a blow, jolt, or penetrating injury | Caused by an internal event affecting the brain, such as oxygen deprivation |
| Often follows collisions, falls, struck-by incidents, and sports or recreation impacts | Often follows near-drowning, cardiac events, or other loss-of-oxygen incidents |
| Claims commonly involve drivers, property owners, employers, or product manufacturers | Claims commonly involve supervision, safety systems, or professional care |
The Centers for Disease Control and Prevention publishes general information on traumatic brain injury and concussion, including signs and symptoms and guidance on when to seek emergency care. Nothing on this page is medical advice, and questions about diagnosis or treatment belong with a qualified health care provider.
Why Delayed Symptoms Matter to a Brain Injury Claim
Symptoms of a brain injury are not always obvious immediately, and the CDC notes that effects can range from short-term to long-lasting depending on the injury. From a legal standpoint, that creates a practical problem: an insurer may argue that a gap between the incident and the first documented complaint means the two are unrelated.
That argument is easier to answer when there is a contemporaneous record. Medical evaluation after a head impact, notes from the people who first noticed changes in memory, mood, sleep, or concentration, and consistent follow-up care all become part of the evidence in a claim. This is a documentation point, not a medical recommendation: decisions about care are for the injured person and their providers.
Deadlines That May Apply to a California Brain Injury Lawsuit
Filing deadlines in California depend on who may be responsible. Missing one can end a claim regardless of its merits, which is why the identity of the potential defendants matters so early.
| Situation | General Rule | Source |
|---|---|---|
| Most personal injury claims against a private party | Two years from the injury | Code Civ. Proc., § 335.1 |
| Claims against a public entity | A written claim generally must be presented to the entity before any lawsuit can be filed, on a timeline much shorter than the general two-year period | California’s Government Claims Act |
| Claims based on a health care provider’s professional negligence | Three years from the injury or one year from discovery, whichever comes first, with statutory exceptions | Code Civ. Proc., § 340.5 |
| Injured person is a minor or lacks legal capacity | California’s tolling provisions may pause a limitations period in defined circumstances, though separate rules can still apply to public-entity and medical claims | Code Civ. Proc., tolling provisions |
These are general rules, and how they apply to a particular set of facts can be genuinely complicated. A lawyer can review the circumstances and explain which deadlines may govern.
Damages California Recognizes in Brain Injury Cases
There is no preset value for a brain injury claim, and no attorney can promise a figure. California recognizes economic and non-economic damages, and the categories that may be available include:
- Past and future medical expenses, including hospitalization, rehabilitation, and ongoing therapies
- Lost income and reduced future earning capacity
- Costs of assistive care, accommodations, or household help
- Pain, suffering, and loss of enjoyment of life
- Loss of consortium, in claims brought by a spouse
In cases where a brain injury is fatal, certain surviving family members may be able to bring a wrongful death claim, which follows its own rules about who may sue and what may be recovered.
How Shared Fault Affects a Brain Injury Case
California follows a pure comparative fault approach. An injured person who is found partly responsible for what happened is not barred from recovering; the recovery is reduced by that person’s share of responsibility. Because reducing a recovery this way is one of the most common defense strategies, how fault is investigated, documented, and presented can matter a great deal to the outcome.
Brain Injury Lawsuits in San Mateo and on the Peninsula
Our office at 15 North Ellsworth Avenue, Suite 105, San Mateo, CA 94401 serves injured people across the Peninsula, where injuries can arise from collisions on US-101, I-280, and El Camino Real, falls on commercial and residential property, bicycle and pedestrian injuries on city streets, and incidents involving public agencies and their vehicles or facilities.
Civil matters for this area are generally heard in the San Mateo County Superior Court. Where a public entity may be involved, whether a city, the county, a transit district, or a school district, the claim-presentation deadline can arrive long before most families are thinking about litigation, which is one reason an early conversation with a lawyer can be useful even if no claim is ever filed.
The office is open by appointment. More detail is available on our San Mateo office page, and additional plain-English explanations are collected in our California personal injury guides.
How Our California Brain Injury Lawyers Can Help
Brain injury cases tend to be evidence-intensive and slow to develop, because the full effect of the injury is not always clear in the first weeks. The brain injury attorneys at Vaksman Khalfin, PC can move early to preserve evidence, identify each party who may be responsible, work with treating providers and experts to document the injury and its effects, calculate the long-term economic impact, and handle communications with the insurers. If a fair resolution is not offered, we are prepared to litigate.
The firm’s personal injury practice is led by Alan D. Khalfin and Robert B. Vaksman. We handle brain injury cases on a contingency-fee basis: there is no upfront cost, and attorney’s fees are owed only if we recover compensation for you. To talk with a California brain injury lawyer, call 650-250-0705 or schedule a free consultation. You can also read our overview of California brain injury claims.
This page provides general information about California law and is not legal advice; reading it does not create an attorney-client relationship. Every case is different, and prior results do not guarantee a similar outcome.
Reviewed by Alan D. Khalfin, Partner and Managing Attorney, Vaksman Khalfin, PC (admitted in California). Last reviewed: 08/14/2026
