Hit by an Uninsured Driver in California: Who Pays for Your Injuries?

You are stopped at a light in Los Angeles, someone plows into the back of your car, and then comes the second gut punch: the other driver has no insurance. Or they hand you an insurance card, but the policy is the bare state minimum, and your emergency room bill alone already blew past it. In California, this is not rare bad luck. Roughly one in five drivers on the road carries no insurance at all, and plenty more carry far too little.

When the at-fault driver cannot pay, your own coverage becomes the whole case. This guide walks through how an uninsured motorist claim in California actually works: who pays, how much, the deadlines that quietly kill these claims, and the traps that catch people who try to go it alone. The single most expensive assumption we see is that because the claim is against your own insurer, it will be handled with a friendly handshake. It will not be.

Uninsured vs. Underinsured: Two Different Problems

People lump these together as “UM/UIM,” and most policies bundle them, but they answer two different questions. Uninsured motorist (UM) coverage steps in when the at-fault driver has no insurance to reach. Underinsured motorist (UIM) coverage steps in when the driver has insurance, just not enough.

The situation	Coverage that applies	What triggers it
At-fault driver has no insurance	Uninsured (UM)	No liability policy in effect at the time of the crash
Hit-and-run, driver flees	Uninsured (UM)	Unidentified driver, subject to the physical-contact and reporting rules below
At-fault insurer denies the claim or goes insolvent	Uninsured (UM)	A policy exists on paper but pays nothing
At-fault driver is insured, but for too little	Underinsured (UIM)	Their liability limit is lower than your own UM/UIM limit

That last row hides a rule that surprises almost everyone, and we will get to it in a moment, because it is where a lot of “underinsured” claims die on arrival.

First Question: Do You Even Have This Coverage?

California does not force you to buy UM/UIM coverage. It forces insurers to offer it. Under California Insurance Code section 11580.2, every auto liability policy must include UM/UIM coverage equal to your liability limits unless you signed a written waiver to delete or reduce it.

Here is the part worth knowing. That waiver has to be in writing and it has to track the statute. Courts read these requirements strictly against the insurer. If the company cannot produce a signed, compliant waiver, the coverage exists by operation of law, whatever the declarations page happens to say. So when an adjuster tells you over the phone that your policy “doesn’t have UM,” do not take it at face value. Ask them to produce the signed waiver. If it is missing, misdated, or sloppy, the coverage is there.

How an Uninsured Motorist Claim Works in California

For a true uninsured driver, the math is simple: the at-fault driver has nothing, so your UM coverage stands in their shoes and pays your damages up to your UM limit. The fight is about the number, not the mechanics.

Underinsured claims are where the structure gets counterintuitive. Two rules do most of the damage to unwary claimants.

Rule 1: “Underinsured” is measured against your limits, not your bills

A vehicle is “underinsured” only when the at-fault driver’s liability limit is lower than your own UM/UIM limit. It has nothing to do with whether their policy covers your medical bills. This is the myth that generic legal content repeats constantly, and it is flatly wrong.

Say you carry $30,000 in UM/UIM coverage and you are hit by a driver who also carries $30,000. Even if your injuries are worth $500,000, the other driver is not underinsured under the statute, because their limit is not lower than yours. Your claim is capped at their $30,000, and your own UIM policy never opens. Equal limits, no UIM. It is a hard rule, and it is the reason we tell people to carry higher UM/UIM limits than the legal minimum.

Rule 2: California subtracts, it does not stack

When UIM does apply, California is a “difference in limits” state. Your UIM insurer does not pay on top of what you already collected from the at-fault driver. It pays the gap between your UIM limit and what the at-fault driver’s insurer paid. Here is the same claim, worked out:

Step	Amount
Your total damages	$150,000
At-fault driver’s liability limit (you collect this first)	$30,000
Your UIM limit	$100,000
Less the $30,000 already paid (the offset)	$70,000 left on your UIM policy
Total you actually recover	$100,000
Left uncompensated	$50,000

In a true “add-on” state you would keep the $30,000 and still have your full $100,000, for $130,000 total. California does not allow that. Once you understand the subtraction, you understand why UIM limits should be set high enough to matter.

The Exhaustion Trap (and the Consent Myth)

Before your UIM coverage opens, you generally have to exhaust the at-fault driver’s liability limits, meaning you collect the full amount of their policy. Settling their policy for less than its limits can defeat that requirement and put your UIM claim at risk.

Now clear up a widespread piece of misinformation: you do not need your UIM carrier’s permission to settle with the at-fault driver. The California Supreme Court settled this in Hartford Fire Insurance Co. v. Macri (1992), holding that the “consent to settle” clause that applies to uninsured claims does not apply to underinsured claims. Your insurer cannot hold your case hostage by refusing consent.

What you should do instead is practical, not permission-seeking: give your UIM carrier written notice before you finalize any settlement, share the terms, and preserve the carrier’s reimbursement and credit rights so you satisfy the exhaustion requirement cleanly. The safest move on a below-limits offer is to loop in an attorney before you sign a release, because a release signed the wrong way can cost you the UIM claim even though consent was never required.

Hit-and-Run: The Physical Contact Rule

If the driver who hit you fled and cannot be identified, they count as uninsured, and your UM coverage can apply. But California built in a fraud guard: for an unidentified “phantom” vehicle, there generally must have been actual physical contact between that vehicle and you or your car.

The practical line looks like this. If a car clips you and speeds off, or gets knocked into you by another vehicle, that is contact. If a car swerves into your lane and you veer into a barrier to avoid it without ever being touched, that usually is not, no matter how clearly it happened. Even honest eyewitnesses do not cure a pure no-contact case.

Two deadlines run on their own clocks in a hit-and-run, and missing either can sink the claim:

• Report the crash to the police or CHP within 24 hours.
• File a sworn statement with your own insurer within 30 days, stating that an unidentified driver caused your injuries.

A phone call to your agent is not the sworn statement. These are separate steps, and insurers do enforce them, so treat both as hard deadlines even while you are still getting medical care.

The Deadlines That Actually Bar These Claims

A UM/UIM claim is a contract claim against your own insurer, so it does not run on the ordinary two-year personal injury clock. It runs on its own rules, and negotiating with an adjuster does not pause them.

Uninsured (UM) claims. Under section 11580.2(i), you must do one of three specific things within two years of the crash to preserve the claim: file a lawsuit against the uninsured driver, reach a formal written settlement with your UM insurer, or formally demand arbitration in writing. Sending demand letters and medical records does not count. If two years pass without one of those three acts, the claim is gone.

Underinsured (UIM) claims. The timing here is different, and genuinely murkier. The California Supreme Court held in Quintano v. Mercury Casualty Co. (1995) that the strict two-year UM rule does not govern UIM claims, because a UIM claim cannot even accrue until the at-fault driver’s policy is exhausted, and no one can predict how long that takes. Instead, UIM arbitration has to be demanded within a reasonable time after exhaustion. “Reasonable” has no fixed number, and sitting on the claim invites defenses like waiver and laches. The takeaway is not “you have forever.” It is “the clock is unpredictable, so move quickly and get advice early.”

One protection worth knowing: if a covered claim is pending, your insurer generally must warn you in writing at least 30 days before the limitation period runs. That warning requirement does not apply once the insurer knows you are represented by an attorney, which is one more reason to have counsel in the file.

For how these interact with the broader filing deadlines after a crash, see our guide to the California statute of limitations for car accidents.

Your Dispute Goes to Arbitration, Not a Jury

If you and your own insurer cannot agree on what your UM/UIM claim is worth, you do not get a jury trial against the company. Section 11580.2(f) sends the dispute to binding arbitration. That is not the same as saying every disagreement goes to the arbitrator, though.

The arbitrator decides two things: whether you are legally entitled to recover from the uninsured or underinsured driver, and the amount of your damages. Coverage questions, such as whether you qualify as an insured under the policy or whether the physical-contact requirement was met, are for a court to decide, not the arbitrator. The California Supreme Court confirmed that division in Bouton v. USAA Casualty Insurance Co. (2008). Putting the wrong issue in front of the wrong decision-maker can get an award thrown out, so the split matters.

It Is Your Insurer, and It Is Still Adversarial

Because you are making a claim against your own carrier, you would expect cooperation. In reality the insurer steps into the shoes of the driver who hit you and defends the claim like an opponent. It does, however, owe you a duty of good faith and fair dealing that a stranger’s insurer does not.

When a UM/UIM insurer crosses the line, unreasonably denying or delaying benefits it clearly owes, running a one-sided investigation, or lowballing with no real basis, that can be insurance bad faith, and you can sue the company in court separately from the arbitration. Bad-faith damages can include emotional distress, the attorney’s fees you spent to force payment of the benefits (known in California as Brandt fees), and in serious cases punitive damages. Merely disagreeing about value and making you prove your damages is not bad faith. Unreasonable conduct is.

How Other Coverage Interacts

UM/UIM does not sit in a vacuum, and your insurer will look for offsets to keep from paying twice for the same loss.

• Medical payments (MedPay). If your policy provides for it, MedPay benefits reduce your damages, not the policy limit. In practice, when your damages far exceed your UIM limit, a MedPay offset changes nothing and the insurer still owes the full limit. This offset only applies if the reduction is actually written into your policy.
• Workers’ compensation. If you were hurt on the job, comp benefits are offset against a UM/UIM recovery, and the arbitration often waits until the comp claim resolves so the numbers are known.
• Health insurance. There is no UM/UIM offset for what your private health plan pays. But your health insurer or ERISA plan may assert a reimbursement lien against your recovery, subject to California’s lien limits and “made whole” protections. Those liens are negotiable, and handling them well is part of maximizing what you keep.

A Warning If You Were the Uninsured One

There is a catch that turns the whole analysis around. Under Proposition 213 (Civil Code sections 3333.3 and 3333.4), if you were driving uninsured when you were hurt, you are barred from recovering non-economic damages, the pain and suffering part of the case, even if the crash was entirely the other driver’s fault. You are limited to economic losses like medical bills and lost wages. The California Supreme Court has applied that bar broadly, including to claims against public entities.

The exceptions are worth knowing, because they restore the right to pain and suffering:

• The at-fault driver is convicted of DUI (an arrest is not enough, watch for the actual conviction).
• You were a passenger, not the owner or operator of the uninsured vehicle.
• Punitive damages against a malicious or drunk driver are not barred.
• Wrongful-death heirs are not barred by a deceased relative’s lack of insurance.

Will Filing a Claim Raise My Rates?

This fear stops people from using coverage they paid for. In California, it is mostly unfounded. Thanks to Proposition 103, an insurer cannot surcharge or cancel you for a not-at-fault accident, and rating is driven by your safety record, annual mileage, and years of experience. The surcharge protection applies when you are 50% or less at fault. A UM/UIM claim, by definition, requires proving that someone else caused the crash, so you are the not-at-fault party. Using your UM, UIM, or MedPay benefits will not lawfully trigger a surcharge for that accident. Filing many claims over time can still affect how an insurer views your overall risk at renewal, but a single not-at-fault claim is protected.

What to Do If an Uninsured or Underinsured Driver Hits You

• Call the police from the scene. For a hit-and-run, that report is a statutory requirement, not just good practice.
• Get medical care right away and keep it consistent. Gaps in treatment are the first thing an adjuster uses to argue your injuries were not serious or not caused by the crash.
• Notify your own insurer promptly, and for a hit-and-run, get the 30-day sworn statement in.
• Do not sign a release or settle the at-fault policy for less than its limits without understanding the effect on your UIM claim.
• Be careful with the “examination under oath.” Your policy may let the insurer put you under oath, on the record. That is not a formality, and you should be prepared for it.
• Get the deadlines calendared. The two-year UM rule and the murkier UIM timing are exactly the kind of thing that is easy to miss and impossible to fix.

For a fuller picture of how all of this feeds into the value of a case, see our pillar guide, How Much Is My Car Accident Case Worth in California?, and if your crash involved a rideshare, our breakdown of Uber and Lyft passenger injury claims, where the UM/UIM rules changed in 2026.

Frequently Asked Questions

What happens if you get hit by an uninsured driver in California?

Your own uninsured motorist (UM) coverage stands in for the at-fault driver and pays your injury damages up to your UM limit. If you waived UM coverage in writing, and the insurer can prove it, you may be limited to whatever you can collect from the driver personally, which is often nothing.

Is uninsured motorist coverage required in California?

No. Insurers must offer it equal to your liability limits, but you can reject or reduce it with a written waiver. Given that about one in five California drivers is uninsured, waiving it is a real gamble.

What is the difference between uninsured and underinsured motorist coverage?

Uninsured (UM) applies when the at-fault driver has no insurance or flees. Underinsured (UIM) applies when they have insurance but their liability limit is lower than your own UM/UIM limit. If their limit equals or exceeds yours, UIM does not apply, no matter how large your damages are.

Does uninsured motorist coverage cover a hit-and-run in California?

Yes, if there was actual physical contact between the fleeing vehicle and you or your car, and you meet the reporting deadlines: a police report within 24 hours and a sworn statement to your insurer within 30 days. A near-miss with no contact generally does not qualify.

How long do I have to file an uninsured motorist claim in California?

For a UM claim, you must file suit, reach a written settlement, or demand arbitration in writing within two years of the crash. Negotiating with the adjuster does not pause that clock. Underinsured claims run on a different, less certain timeline tied to when the at-fault policy is exhausted, so move quickly.

Will my insurance rates go up if I file an uninsured motorist claim?

Not for the accident itself. California law prohibits surcharging or canceling you for a not-at-fault claim, and a UM/UIM claim requires proving the other driver was at fault. Your rate is based on your driving record, mileage, and experience, not on using coverage you paid for.

Talk to a Lawyer Before You Talk to the Adjuster

An uninsured motorist claim in California turns on details that are easy to get wrong and hard to undo: the exhaustion requirement, the limits comparison, the physical-contact rule, and the deadlines that no one reminds you about. Every case is different, and nothing here is a promise about yours. But the earlier you have someone in your corner who handles these claims, the less likely it is that a technicality decides the outcome instead of the facts. If an uninsured or underinsured driver hurt you or someone in your family, contact Power Legal Group for a free consultation. We work on contingency, so you pay nothing unless we win.