Medical emergencies come first. The CDC lists warning signs after a head injury that call for emergency care right away, including a headache that keeps getting worse, repeated vomiting, seizures, slurred speech, one pupil larger than the other, trouble recognizing people or places, growing confusion or agitation, and being unusually drowsy or hard to wake. If any of these are present, call 911. See the CDC’s page on symptoms of mild TBI and concussion.
A car accident head injury is proven a little differently from other head injuries. Medical records still matter most, but a car crash adds another source of proof: the collision itself. The vehicles, the airbag system, the 911 call, the paramedics’ notes, and the people who saw you at the scene all record what happened to your body in the first minutes. This page covers that crash-specific evidence, the “low-impact” argument insurers often make, and which auto coverages may pay for what. For the general claim process that applies to any head injury, see our guide to first steps in a California head injury claim.
Car Accident Head Injury Claims at a Glance
- The CDC says a concussion can come from a jolt or a hit to the body that makes the head move quickly back and forth, not only from a blow to the head. That matters in rear-end and side-impact crashes.
- Much of the most useful evidence in a crash case is gone within days or weeks: salvaged vehicles, overwritten video, and fading memories at the scene.
- An insurer may argue that little vehicle damage means little injury. The answer to that argument usually comes from crash details and the medical timeline, not from repair costs.
- Several different policies may be involved, and each pays under its own rules.
- A government vehicle or a dangerous public road brings a much shorter claim deadline.
How a Car Accident Causes a Head Injury
According to the CDC, a mild traumatic brain injury or concussion can be caused by a bump, blow, or jolt to the head, or by a hit to the body that makes the head and brain move quickly back and forth. That second cause describes many car accident head injuries, even when the head never strikes anything. When a car is hit from behind or from the side, the seat belt holds the torso in place while the head keeps moving.
Inside a car, a head can also hit something. It may strike the side window or door frame in a T-bone collision, the headrest in a rear-end impact, or the steering wheel, dashboard, or a deploying airbag in a frontal crash. Loose items in the cabin can hit it too. A claim does not require a bruise, cut, or bump. What matters is showing what happened to the body during the crash and what changed afterward.
The CDC also notes that a mild TBI may not show up on a CT scan or other imaging and can still be present. Some symptoms can take hours or days to appear. For how the law treats claims where imaging is normal, see our page on mild traumatic brain injury settlements.
“The Cars Barely Had a Scratch”: Low-Impact Crashes and Head Injuries
A common insurer response to a car accident head injury claim is to point to the repair estimate. The argument is simple: little metal damage, little force, no real injury. It can be persuasive to adjusters and jurors, and it deserves a real answer instead of being dismissed.
A repair bill measures what it costs to fix the car. It does not measure what happened to the people inside. Several crash details may help explain an injury despite modest vehicle damage:
- Where the occupant was looking. A head turned toward a mirror, a passenger, or a child in the back seat moves differently than one facing forward.
- Size and weight differences. A pickup or SUV hitting a small sedan can transfer more force to the smaller car than its bumper damage shows.
- Seat and headrest position. A reclined seat or a low headrest can change how the head moves on impact.
- Surprise. An occupant who did not see the impact coming has no time to brace.
None of this proves an injury on its own. It explains why the medical record, and not the repair invoice, should decide the question. The rear-end version of this dispute is covered in our guide to rear-end collisions and fault in California.
Crash Evidence That Can Support a Car Accident Head Injury Claim
This evidence tends to disappear fast. The table below lists what exists after a typical collision and why each item can matter in a car accident head injury claim.
| Evidence | What it can show | Why timing matters |
| Photos of the vehicle interior | Head contact points, such as a cracked side window, a bent headrest, a starred windshield, or a deployed curtain airbag | Once repairs start or the car is declared a total loss, the interior can’t be photographed again |
| The vehicle itself | Crush patterns and the direction of force | Total-loss vehicles are often moved to salvage and sold quickly |
| Airbag control module / event data | Speed change, braking, and seat belt use around the moment of impact, depending on the vehicle | Getting the data involves technical and legal steps, and it can be lost if the vehicle is scrapped |
| Dashcam, doorbell, traffic, or business video | How the crash happened and how the occupant moved or acted afterward | Many systems record over footage automatically |
| 911 recording and EMS run report | The first independent description of confusion, repeated questions, or loss of consciousness | Getting the records requires specific requests. What they hold can’t be recreated later. |
| Police collision report | Parties, witnesses, the reporting officer’s observations, and sometimes injury complaints at the scene | Usually available, but witness contact details should be followed up while memories are fresh |
| Witness accounts | Whether you seemed dazed, repeated yourself, or couldn’t answer basic questions | Strangers at a crash scene are hard to find again after a few weeks |
For the steps to take at the scene of any collision, including reporting duties, see what to do after a car accident in California.
Documenting a Head Injury From a Car Accident
A car accident head injury is often documented in a particular order: a paramedic’s notes, then an emergency department visit, then primary care, and sometimes a referral to neurology, neuropsychology, or therapy. Insurers read that sequence closely, and gaps or inconsistencies in it tend to become the focus of the claim.
A few practical points often affect how clear the trail is:
- Name the mechanism. Telling each provider that the injury came from a car crash, and what your head may have hit or how it moved, puts the cause into the records.
- Report every symptom, including the minor ones. Neck pain after a crash often gets all the attention. Headaches, light sensitivity, trouble sleeping, irritability, or losing your train of thought may go unmentioned unless you raise them.
- Keep a short daily log. Dated notes on symptoms and on tasks that became harder give later providers and reviewers something concrete to work from.
- Follow through on referrals. A referral that never became an appointment can be read as a sign the problem went away.
Treatment decisions belong to your doctors. This section is about how those decisions get recorded, not about what care to seek.
Insurance Calls in the First Weeks After the Crash
After a crash, the other driver’s insurer often calls quickly. It may ask for a recorded statement and a signed medical authorization. With a head injury, this raises a specific problem: the person being asked to describe the crash and their symptoms may not yet remember or understand either one well. Early statements that turn out to be incomplete can later be framed as inconsistencies.
Your own insurer is different. Your policy may require you to cooperate with your own company, and the terms vary. A lawyer can explain what each policy requires, what a broad medical authorization would allow an insurer to see, and whether it makes sense to wait until the medical picture is clearer before giving any detailed account.
Who Pays for a Car Accident Head Injury?
A car accident head injury can involve several insurance sources at once. Each one has its own rules, limits, and paperwork.
| Source | What it generally covers | Where to read more |
| At-fault driver’s liability coverage | Injury losses caused by that driver, up to the policy’s limits | Car accident settlements |
| Your uninsured / underinsured motorist coverage | Your losses when the at-fault driver has no insurance or too little, if your policy includes it | Uninsured motorist coverage |
| Medical payments coverage on your auto policy | Some medical expenses regardless of fault, if you bought it | Your policy’s declarations page |
| Health insurance | Treatment under your plan. The plan may seek repayment from any recovery. | Economic damages in a brain injury claim |
| Rideshare company policies | Depends on the app’s status at the time of the crash | Uber and Lyft accidents |
If fault is shared, California reduces a recovery by the injured person’s share of responsibility instead of barring it. See pure comparative fault.
Filing Deadlines, Including Crashes With Government Vehicles
Some crashes involve a city bus, a county truck, a state vehicle, or a roadway defect such as a missing sign or a dangerous design. In those cases, a claim usually has to be presented to the public entity before any lawsuit can be filed, under California’s Government Claims Act. The California Courts self-help guide says the deadline to file a government claim for an injury is 6 months from the injury. That is far shorter than the general deadline.
For crashes between private parties, the California Courts self-help guide lists 2 years from the date of injury as the general deadline for a personal injury lawsuit. Exceptions and extensions exist, including limited ones when the injured person lacked legal capacity. They are narrow, and they are explained on our page on whether you can sue for a brain injury. Relying on an exception without legal advice is risky.
Passengers and Family Members
A passenger who hits their head in a crash may have a claim against the other driver, against the driver of the car they were riding in, or against both, depending on who caused the crash. A claim involving the driver of your own car is usually handled by that driver’s liability insurer, not paid personally by a friend or relative. A lawyer can explain how the relationship and the policy terms may affect it.
After a head injury, the people who live or work with the injured person are often the first to notice changes the person can’t see in themselves: a shorter temper, missed appointments, repeating stories, avoiding noise or screens. Their dated, specific observations can support what the medical record shows. How those accounts are used later in a case is covered in our page on the traumatic brain injury lawsuit process.
Compensation Categories in a Car Accident Head Injury Claim
California recognizes two broad categories of loss in these claims. Economic losses include medical care, future treatment, lost income, and reduced earning capacity. Non-economic losses include physical pain, emotional distress, and loss of enjoyment of life. What a particular claim may be worth depends on the evidence, the fault allocation, and the insurance available. No general page can predict it. For more detail, see economic and non-economic damages and pain and suffering after a California car crash. When a claim is ready to present to an insurer, our page on the brain injury demand letter explains what goes into it.
Talk With a Car Accident Head Injury Lawyer at Vaksman Khalfin
Vaksman Khalfin, PC represents people injured in California car crashes, including people with a car accident head injury or brain injury. A consultation is free. The firm handles injury matters on a contingency fee, meaning attorney’s fees are a percentage of any recovery. Case costs, such as records, filing fees, and expert fees, are separate, and the written fee agreement explains how they are handled. Call (877) 780-4727 to talk through what happened. You can also start with our California brain injury practice page or the car accident practice page.
Reviewed by Alan D. Khalfin, Partner, Vaksman Khalfin, PC (admitted in California) Last reviewed: 09/24/2026
Frequently Asked Questions
Yes, according to the CDC, some symptoms of a mild TBI or concussion may not appear for hours or days after the injury. When symptoms start later, the medical record from that point forward is especially important in a car accident head injury claim. Anyone with worsening symptoms after a crash can seek medical care right away.
It can. The CDC describes concussion as something that can result from a jolt or a hit to the body that moves the head quickly back and forth, not only from a direct blow. The amount of vehicle damage is not a medical measure of what happened to the occupants. Whether a particular person was injured is a medical question for their doctors.
It can be useful evidence either way. Deployment shows the crash was severe enough to trigger the system and may itself be a point of head contact. Non-deployment does not mean there was no injury. According to NHTSA, frontal and side airbags are generally designed to deploy in moderate to severe crashes, not in every collision.
That's a decision worth making with a lawyer, especially after a head injury. Early statements may be incomplete if memory or concentration is affected, and they can be compared against later records. Your own insurer's policy may have separate cooperation requirements.
Often more than one source is involved. That may include your health insurance, medical payments coverage if your auto policy has it, the at-fault driver's liability coverage once the claim resolves, and your uninsured or underinsured motorist coverage in some situations. Health plans and other payers may seek repayment from a recovery.
It depends on who caused the crash. The claim may be against the other driver, the driver of the car you were in, or both. If you were in a rideshare vehicle, the app company's insurance may also apply depending on the app's status.
Evidence that can disappear includes interior photos showing where a head may have hit, the vehicle itself before salvage, dashcam or nearby video, the 911 recording and EMS report, and contact information for witnesses who saw how you seemed at the scene. A lawyer can explain how to preserve and request these.
Claims against public entities generally have to be presented to the entity under California's Government Claims Act before a lawsuit. The California Courts self-help guide lists 6 months from the injury as the deadline for injury claims. That is far shorter than the general deadline for suing a private party.
The California Courts self-help guide lists 2 years from the date of injury as the general deadline for personal injury lawsuits, with shorter deadlines for claims against government entities. Some exceptions exist but are narrow. A lawyer can confirm which deadline applies to your situation.
