Uninsured and Underinsured Motorist Coverage in California: What Every Driver Needs to Know

One in five California drivers has no auto insurance — 20.4% as of 2023, the eighth-highest rate in the nation, according to the Insurance Research Council’s 2025 study. A lot more carry the legal minimum, which isn’t nearly enough to cover the damages in a serious crash. If you’re hit by one of them, the only thing standing between you and paying for the crash yourself is a single line item on your own auto policy: uninsured and underinsured motorist coverage.

Most California drivers either don’t carry this coverage, don’t carry enough of it, or have been talked out of using it when they needed it most. The cost is real. A serious injury caused by an uninsured driver who has nothing to pay with becomes your problem if you haven’t protected yourself.

This page covers what uninsured and underinsured motorist coverage actually is, how it works in California, what the statutory rules say about coverage limits, why using it won’t raise your rates, and what to do when you’re injured by a driver who can’t pay for what they did.

I’ve handled uninsured and underinsured motorist cases in California since 2003. The single biggest pattern I see is injured people who assumed their own insurance would protect them, discovering at the worst possible moment that it wouldn’t — or that the coverage they thought they had was rejected years ago in writing and they never knew.

Here’s how it actually works.

What uninsured and underinsured motorist coverage does

Uninsured motorist coverage and underinsured motorist coverage — UM and UIM — are two forms of protection on your own auto insurance policy. Both cover injuries you sustain in a crash caused by another driver. The difference is what triggers each one.

UM coverage pays for your injuries when the at-fault driver has no insurance at all. It also applies in hit-and-run cases where the at-fault driver can’t be identified. In either situation, there’s no insurance on the other side to pay for what happened to you. UM coverage on your own policy fills that gap.

UIM coverage applies when the at-fault driver has insurance, but their limits aren’t enough to cover your actual damages. If the driver who hit you carries the California minimum of $30,000 in bodily injury liability and you have $200,000 in medical bills alone, their policy is going to max out long before you’re made whole. Your UIM coverage pays the difference, up to your UIM policy limits.

Both coverages exist because the alternative — leaving injured people to personally chase uncollectible judgments against at-fault drivers who have no money — doesn’t actually produce recovery. Drivers who carry no insurance often have no assets worth pursuing. The UM/UIM system is the mechanism that makes sure you have somewhere to collect from when the other side doesn’t.

Why this coverage matters so much in California

The reason UM/UIM coverage is especially important in California comes down to one number: 20.4%. That’s the percentage of California drivers who were uninsured in 2023, according to the Insurance Research Council’s 2025 study Uninsured and Underinsured Motorists: 2017–2023. California ranks eighth-highest in the nation for uninsured drivers.

One in five. That’s not a rare outlier scenario. That’s every fifth car on the road.

The national picture is also grim. The same IRC study found that 15.4% of U.S. drivers were uninsured in 2023, and one in three (33.4%) was either uninsured or underinsured — a 10-percentage-point increase in the combined rate since 2017, driven by deteriorating insurance affordability and post-pandemic economic strain.

Add to that the drivers who are insured but carry minimum limits. California’s new minimum bodily injury liability is $30,000 per person, which went into effect on January 1, 2025 under Senate Bill 1107. Before that it was $15,000 — a limit that was so inadequate for modern medical costs that the legislature finally raised it after decades. Even the new $30,000 minimum doesn’t cover a serious injury. A single ambulance ride and ER visit can burn through it. A surgery pushes the case well past the minimum before any follow-up treatment is factored in.

What that means, practically: if you’re hit by a minimum-limits driver in a serious crash, their $30,000 disappears almost immediately, and everything beyond that comes out of your own UIM coverage or out of your own pocket.

The protection against this entire picture — the uninsured drivers, the hit-and-run drivers, and the underinsured drivers with limits that can’t cover what they caused — is UM/UIM coverage on your own policy. It’s not optional protection in any practical sense. It’s the main line of defense against the actual risk profile of California roads.

The California rules that govern UM/UIM coverage

California has specific statutory rules about how UM/UIM coverage is offered and structured. The law is at Insurance Code §11580.2, and the rules matter because they shape what coverage you have, how much of it, and what options exist for increasing it.

Here’s what you need to know.

Insurance carriers are required to offer UM/UIM coverage with every auto policy. You can’t buy liability insurance in California without the carrier offering UM/UIM alongside it. This is mandatory on the carrier’s side.

You can decline UM/UIM coverage — but only in writing. A verbal decline isn’t enough. The carrier is required to document your refusal in a signed written waiver. If you don’t sign a waiver, you have UM/UIM coverage by default. This matters in practice: a lot of drivers who think they rejected UM/UIM coverage are actually covered because the waiver was never executed properly. If there’s any doubt, a personal injury attorney can request the policy file and check.

Your UM/UIM limits can’t exceed your bodily injury liability limits. This is the rule most drivers don’t know about, and it changes how you should think about coverage. Under Insurance Code §11580.2(m), UM/UIM coverage is offered at limits equal to the bodily injury liability limits of the underlying policy. You can elect lower UM/UIM limits in writing, subject to the statutory minimum. But you cannot carry UM/UIM limits that are higher than your liability limits on the same policy.

What that means in practice: if you want higher UM/UIM protection, you have to carry higher liability limits. There’s no way to buy extra UM/UIM without also increasing your liability coverage. The two are tied.

You can’t be penalized for using UM/UIM coverage. This is the other rule drivers consistently don’t know. California law prohibits insurance carriers from raising your premiums, refusing to renew your policy, or otherwise penalizing you for using UM or UIM benefits. Rate increases and non-renewals in California require that the insured was at fault in the incident. If you weren’t at fault, your carrier cannot adversely affect your coverage because you filed a UM/UIM claim.

A lot of Californians hesitate to file UM/UIM claims because they’re afraid their premiums will go up. That fear is based on a common misunderstanding of how California insurance law works. The protection against premium retaliation is real and statutory.

How much UM/UIM coverage you should carry

Given that UM/UIM limits are capped at your liability limits, the question of how much UM/UIM coverage to carry is really a question of how much liability coverage to carry — because the two are linked.

The California minimum is $30,000 per person and $60,000 per accident in bodily injury liability. That means the maximum UM/UIM coverage available at minimum limits is also $30,000 per person and $60,000 per accident.

That’s not enough. $30,000 covers a fraction of what a serious injury actually costs. A single surgery, a few nights in the hospital, and initial rehabilitation will exceed $30,000 in almost every serious case. If you’re relying on $30,000 of UM/UIM to cover a serious injury from an uninsured driver, you’re going to run out of coverage long before you’re made whole.

For most California drivers with meaningful assets to protect and a real risk of being seriously injured in a crash, reasonable liability and UM/UIM limits start at $100,000 per person / $300,000 per accident and go up from there. Drivers with higher incomes, significant assets, or families that depend on them should consider higher limits still. The cost of increasing these limits is modest compared to the cost of exhausting coverage in a serious crash.

I’m not going to tell you what specific number to carry — that’s a decision between you, your insurance agent, and your family’s financial situation. But I will tell you that the statutory minimum is dangerously low given the reality of California roads, and that most drivers who’ve been through a serious UM/UIM claim walk away wishing they’d carried more.

How UM/UIM claims work when you’re hit

When you’re injured by an uninsured or underinsured driver, the claim process looks different from a standard third-party claim. Here’s what actually happens.

Step 1: Exhaust the at-fault driver’s coverage, if any exists. If the at-fault driver has any insurance, that policy is pursued first. Their carrier pays up to its limits. What they pay becomes the baseline, and your UIM coverage fills the gap above that. If the at-fault driver is entirely uninsured or unidentified, UM coverage applies directly without a third-party policy to exhaust first.

Step 2: Notify your own carrier and file the UM/UIM claim. This is where the dynamic shifts in a way that surprises a lot of people. Your own insurance company — the one you’ve paid premiums to for years — now becomes the adversary. Its financial interest in a UM/UIM claim is exactly the same as the at-fault carrier’s interest in a standard claim: minimize the payout. The same tactics you’d see from the other side, you’ll see from your own carrier. The same pressure to give a recorded statement. The same minimizing of injuries. The same early lowball offers.

This is why legal representation is as important in a UM/UIM claim as in any other. The fact that you’re dealing with your own insurance company doesn’t mean they’re on your side in this context. They aren’t.

Step 3: Build the case. The process from here looks similar to a third-party claim. Medical records get compiled. Treatment proceeds to completion or maximum medical improvement. A demand is prepared. Negotiation begins.

Step 4: Resolve through negotiation, arbitration, or litigation. One important procedural note about UM/UIM: most California UM/UIM policies contain an arbitration clause requiring disputes to go to binding arbitration rather than court. This is standard. It’s not a bad thing — arbitration is often faster than litigation — but it changes the procedural landscape and the tactics that make sense. An attorney familiar with UM/UIM arbitration knows how to work within that structure.

The exhaustion rule that traps unrepresented claimants

This is the single most important reason every California driver in a serious crash with an underinsured at-fault driver needs an attorney. It’s a statutory rule, it’s not negotiable, and getting it wrong forfeits your right to UIM compensation entirely.

Under California Insurance Code §11580.2(p)(3), UIM coverage does not apply until the limits of every bodily injury liability policy applicable to the at-fault driver have been exhausted by payment of judgments or settlements, with proof of payment submitted to the UIM insurer. In plain language: you must collect every penny of the at-fault driver’s policy limits before you can access your own UIM coverage.

If you settle with the at-fault driver’s carrier for even one dollar less than the full policy limit, you forfeit your UIM claim. Not reduce it. Forfeit it. The UIM carrier walks away with no obligation to pay you anything, regardless of how seriously you were injured or how much your damages exceed the at-fault driver’s limit.

This trap catches unrepresented claimants regularly. The at-fault driver’s adjuster offers a settlement that’s 90 cents on the dollar of the policy limit — sometimes 95, sometimes 99. The claimant, eager to resolve and not understanding the consequences, accepts. The UIM claim, which would have paid out hundreds of thousands of additional dollars, is gone. The claimant only finds out when they try to make the UIM claim and their own carrier denies it under §11580.2(p)(3).

An attorney working a UM/UIM case knows this rule cold. The case is structured from the start to either obtain the full at-fault policy limit, or to litigate the at-fault claim through to a judgment that exhausts the limit, before the UIM claim is even opened. There are no shortcuts here, and there’s no margin for error.

BANA LAW has handled hundreds of UM and UIM claims under §11580.2 for California drivers. The exhaustion rule is one of the most common reasons we tell people they need representation in this area. The rule itself is short. The cost of getting it wrong is enormous.

What to do if the at-fault driver fled the scene

Hit-and-run crashes are a particular category of UM claim. Your UM coverage applies even though the at-fault driver can’t be identified — but California has specific rules about what you have to show to make a hit-and-run UM claim.

Generally, you need either independent corroboration of the incident (typically a witness statement, dashcam footage, or similar evidence from a source other than yourself) or physical contact between the vehicles. An unwitnessed, non-contact “phantom vehicle” claim — where a driver you didn’t see caused you to swerve and crash — faces a harder evidentiary standard under California law.

What to do at the scene of a hit-and-run:

•         Call law enforcement immediately
•         Get medical evaluation
•         Identify and get contact information from any witnesses before they leave
•         Note the time, location, and any details about the other vehicle you observed
•         Check for nearby surveillance cameras — gas stations, storefronts, residential Ring cameras
•         Preserve any physical evidence at the scene, including debris from the other vehicle

A personal injury attorney can help gather evidence from sources that aren’t obvious — traffic cameras, business surveillance, witness canvassing — and can evaluate whether the available evidence is sufficient to support a hit-and-run UM claim.

Common scenarios where UM/UIM coverage matters most

A few specific situations where UM/UIM protection either saves a claim or leaves an injured person without recovery.

The underinsured drunk driver. A driver with the California minimum $30,000 in liability causes a serious injury crash while intoxicated. The $30,000 pays a fraction of your medical bills. Without UIM coverage, you’re pursuing personal assets the driver doesn’t have. With UIM coverage, your own policy pays the balance up to your UIM limits.

The uninsured commercial driver. A driver working for a small delivery service, using their personal vehicle without commercial coverage, causes a serious crash. The driver has no personal insurance that applies, and the employer’s commercial policy may be contested. UM coverage on your own policy provides recovery while the coverage disputes are worked out.

The hit-and-run on the freeway. A driver causes a crash and flees. You never identify them. Without UM coverage, there’s no one to pursue. With UM coverage, your own policy treats the incident as if the at-fault driver were uninsured — because functionally, they are.

The out-of-state driver with minimal coverage. A driver from a state with lower minimum limits causes a crash in California. Their out-of-state policy may pay only their state’s minimum, which is sometimes substantially below even California’s old minimum. UIM coverage makes up the difference.

Every one of these scenarios is common. Every one of them depends on the injured person having carried adequate UM/UIM coverage at the time of the crash.

What to do right now

If you take one thing from this page, make it this: pull up your current auto insurance policy and look at your UM/UIM limits.

Find the section that lists your coverages. Look specifically for:

•         Whether you have UM coverage at all
•         Whether you have UIM coverage at all
•         What the limits are for each
•         Whether any waiver of UM/UIM is in your policy file

If you don’t have either coverage, or if your limits are at the California minimum, call your insurance agent or broker this week and increase them. The additional premium is modest. The additional protection is substantial.

If you’re not sure what your policy says, or if you can’t find it, request a current declarations page from your carrier. They’re required to provide it. Most will send it by email within a few hours.

If you’ve already been injured in a crash and you’re not sure what coverage applies, call us at 800-789-8840. We can evaluate both the at-fault driver’s coverage and your own UM/UIM coverage to identify every available source of recovery. Consultations are free, and we work on contingency.

Frequently Asked Questions

What is uninsured motorist coverage in California?

Uninsured motorist (UM) coverage is a part of your own auto insurance policy that pays for injuries you sustain when you’re hit by a driver who has no insurance. It also applies in hit-and-run cases where the at-fault driver can’t be identified. UM coverage exists because injured drivers need somewhere to collect from when the other side has nothing.

What’s the difference between UM and UIM coverage?

UM coverage applies when the at-fault driver has no insurance at all. UIM coverage applies when the at-fault driver has insurance but not enough to cover your damages. Both are on your own auto policy, and they work together to protect you depending on the other driver’s coverage situation.

Is UM/UIM coverage required in California?

No. California requires insurance carriers to offer UM/UIM coverage with every auto policy, but drivers can decline it in writing. If you haven’t signed a written waiver, you have UM/UIM coverage by default. Most California drivers should carry this coverage given that approximately 20.4% of California drivers are uninsured — the eighth-highest rate in the nation, according to the Insurance Research Council’s 2025 study.

Can my UM/UIM limits be higher than my bodily injury liability limits?

No. Under California Insurance Code §11580.2, UM/UIM limits are capped at your bodily injury liability limits on the same policy. If you want higher UM/UIM protection, you have to carry higher liability limits. The two are linked.

Will my insurance rates go up if I use my UM/UIM coverage?

No. California law prohibits insurance carriers from raising your premiums, refusing to renew your policy, or penalizing you for using UM or UIM benefits. Rate increases and non-renewals are only allowed when the insured was at fault. If you weren’t at fault, using the coverage you paid for is protected.

Do I need an attorney for a UM/UIM claim?

Yes, in most serious injury cases. Your own insurance company becomes the adversary in a UM/UIM claim, and it will use the same tactics the at-fault carrier would use in a standard claim. Legal representation produces better outcomes and protects you from common pitfalls — recorded statements, early lowball offers, and procedural traps.

What if the at-fault driver fled the scene?

Your UM coverage still applies in a hit-and-run, but California generally requires either independent corroboration of the incident or physical contact between the vehicles. Call law enforcement immediately, get medical evaluation, identify witnesses, and preserve any evidence. A personal injury attorney can help gather evidence that may not be obvious, including surveillance footage from nearby businesses.

How much UM/UIM coverage should I carry?

The California minimum is $30,000 per person and $60,000 per accident, which is not enough to cover a serious injury. Most drivers should consider limits starting at $100,000 per person / $300,000 per accident and higher if their assets or family situation warrants it. Because UM/UIM is capped at your liability limits, increasing UM/UIM protection requires increasing liability coverage.

What happens if I was injured but I don’t have UM/UIM coverage and the at-fault driver is uninsured?

Your options are limited but not zero. An attorney can investigate whether additional sources of recovery exist — including the at-fault driver’s personal assets, employer liability if the driver was working at the time of the crash, third-party liability theories, and available med-pay coverage on your own policy for medical expenses. None of these are substitutes for UM/UIM coverage, but they’re worth exploring.

Do I have to collect the full policy limit from the at-fault driver before I can use my UIM coverage?

Yes. Under California Insurance Code §11580.2(p)(3), UIM coverage does not apply until the at-fault driver’s bodily injury liability limits have been exhausted by payment of judgments or settlements. If you settle with the at-fault driver’s carrier for even one dollar less than the full policy limit, you forfeit your UIM claim entirely. This is one of the most consequential rules in California UM/UIM law, and one of the most common reasons unrepresented claimants lose access to coverage they’re otherwise entitled to. An attorney structures the case from the start to ensure the at-fault policy is fully exhausted before the UIM claim is opened.

Talk to a BANA LAW Attorney

Consultations are free, carry no obligation, and are conducted by a BANA LAW attorney — not a screener. We come to you when you can’t come to us: by phone, by video, in person at our Los Angeles office, by appointment in San Bernardino or Fresno, at your home, or at your bedside if you’re hospitalized.

BANA LAW operates on a contingency fee basis. No fees unless we win. No upfront fees. No costs to advance. The firm operates bilingually in English and Spanish, and every member of the team is bilingual.

Call 800-789-8840.