The Quick Answer (TL;DR)
- California requires insurers to offer underinsured motorist (UIM) coverage, but drivers may reject it in writing.
- UIM coverage pays the gap between the at-fault driver's policy payout and your actual damages, up to your own UIM limit.
- California's current minimum liability limits, raised to $30,000 per person / $60,000 per accident under Cal. Veh. Code §16056 effective January 1, 2025, are routinely too low for serious injuries.
- Before accepting any settlement from the at-fault driver's insurer, you must get your own insurer's consent or risk waiving your UIM rights.
- You typically have two years from the accident date to file a personal injury lawsuit in California under Cal. Code Civ. Proc. §335.1, but your UIM policy may impose shorter internal deadlines.
- If the other driver's coverage falls short, call (818) 794-9947 for a free case review. No fee unless we win.
If you were hurt in a car accident in California and the other driver's insurance barely covers your medical bills, you are facing one of the most common and most frustrating problems in personal injury law. The at-fault driver carries the state minimum, your bills are climbing, and you are wondering who pays the rest.
That is exactly what underinsured motorist (UIM) coverage is designed to do. This guide explains how UIM coverage works under California law, what steps you must take to protect your claim, and why your own insurer may not make the process easy.
The Difference Between Uninsured and Underinsured Motorist Coverage
California law addresses two related but distinct problems in California Insurance Code §11580.2:
Uninsured motorist (UM) coverage applies when the at-fault driver has no liability insurance at all, or when you are the victim of a hit-and-run and the other driver cannot be identified.
Underinsured motorist (UIM) coverage applies when the at-fault driver has insurance, but their policy limits are lower than your total damages. The at-fault driver is not uninsured. They just do not have enough.
Both coverages are required to be offered by every auto insurer writing policies in California. You can reject them, but only by signing a written waiver. If you did not sign a waiver, you likely have both on your policy right now.
When the Other Driver's Policy Limits Fall Short of Your Injuries
California's minimum auto liability limits were raised by SB 1107 to $30,000 per person and $60,000 per accident for bodily injury, plus $15,000 for property damage, effective January 1, 2025, under Cal. Veh. Code §16056. Those numbers sound workable until you price a real injury.
Consider a single broken leg with surgery, a short hospital stay, and six weeks of physical therapy. Medical bills alone can easily reach $60,000 to $90,000 before lost wages or pain and suffering. If the at-fault driver carries only the minimum, their insurer pays you $30,000 and closes the file. The remaining balance is your problem, unless you have UIM coverage.
For more serious injuries, the gap becomes even larger. A traumatic brain injury, a spinal injury, or multiple fractures can generate hundreds of thousands of dollars in medical costs, years of lost income, and permanent disability. A minimum-limits policy leaves an enormous shortfall.
California's current minimum auto liability limits are $30,000 per person and $60,000 per accident under Vehicle Code §16056, effective January 1, 2025.
This is the economic reality that makes UIM coverage one of the most important, and most frequently overlooked, protections you can buy.
How UIM Coverage Fills the Gap in California
Here is the basic math of a UIM claim.
Suppose you have $80,000 in documented damages (medical bills, lost wages, pain and suffering). The at-fault driver has a $30,000 per-person liability limit. Their insurer pays you $30,000. Your UIM policy has a $100,000 limit.
Your UIM insurer pays the difference: $80,000 minus $30,000 equals $50,000. Your UIM coverage has a $100,000 limit, so the full $50,000 gap is covered.
If your damages exceeded your UIM limit, you would absorb the remaining amount yourself, unless you have other sources of recovery (such as a third-party product liability claim, or a workers' compensation claim if the accident happened on the job).
One critical rule: In California, your UIM coverage limit must be higher than the at-fault driver's liability limit for UIM to apply at all. If the at-fault driver carries $100,000 per person and your UIM limit is also $100,000, you do not have a UIM claim, even if your damages are $200,000. The gap is measured between the at-fault driver's coverage and your UIM limit, not between the at-fault driver's coverage and your actual damages.
A UIM claim pays the difference between what the at-fault driver's policy covers and what your actual damages are, up to your own UIM policy limit.
The Steps and Consent Rules Before Settling With the At-Fault Driver
This is where UIM claims most often go wrong, and it is critical to understand before you sign anything.
Step 1: Document everything immediately.
Gather the police report, photographs, witness contact information, and all medical records from day one. Your UIM insurer will scrutinize every gap in your documentation.
Step 2: Notify your own insurer as soon as possible.
Most UIM policies require prompt notice of any accident that might give rise to a UIM claim. Read your policy's notice requirements. Delaying notice can give your insurer a basis to dispute coverage.
Step 3: Get your insurer's consent before settling with the at-fault driver.
This is the single most common mistake that kills a UIM claim. Under California law, if you settle with the at-fault driver and release them without first notifying your own UIM insurer and getting consent, you may lose your right to pursue the UIM claim entirely. Your insurer has the right to step into the at-fault driver's shoes (a concept called subrogation) and pursue the at-fault driver independently. If you release the at-fault driver without permission, you may eliminate your insurer's subrogation rights, which gives them grounds to deny your UIM claim.
In practice, the notice and consent process works like this: you tell your UIM insurer that the at-fault driver's insurer has offered its policy limits, you ask for consent to accept, and your UIM insurer has 30 days to either consent or advance that amount to you and then pursue the at-fault driver themselves.
Step 4: File the UIM claim with your own insurer.
Once you have accepted the at-fault driver's policy-limits settlement with your insurer's consent, you submit your UIM claim. Your insurer then evaluates your total damages and makes an offer.
Step 5: Negotiate or arbitrate if the insurer's offer is too low.
Most UIM policies include a binding arbitration clause. If you and your insurer cannot agree on the value of your claim, the dispute goes to an arbitrator rather than a jury. This changes the dynamics of the negotiation significantly.
Before settling with the at-fault driver, you must notify your own insurer and get consent, or you may lose your right to file a UIM claim.
Why Your Own Insurer May Push Back on a UIM Claim
Your own insurer steps into the at-fault driver's shoes on a UIM claim, which means the insurer has the same incentives to minimize your payout that the other driver's carrier had.
This surprises many people. You pay premiums to your own insurance company for years. You expect them to be on your side. On a UIM claim, they are not.
Your insurer is paying out of its own pocket on a UIM claim. That means it has every financial reason to:
- Dispute the extent of your injuries. The insurer may argue your treatment was excessive, your recovery period was too long, or your symptoms were pre-existing.
- Challenge the value of your pain and suffering. UIM adjusters use the same tactics as third-party adjusters, offering a lower number and hoping you will accept it.
- Invoke the arbitration clause. Many insurers prefer arbitration over litigation because arbitration awards have historically trended lower than jury verdicts in California, though results vary case by case.
- Dispute the at-fault driver's liability. Even though the at-fault driver's insurer already paid its limits, your own insurer can still argue that the accident was partially your fault, which would reduce your UIM recovery under California's comparative fault rules.
California does have protections against insurer bad faith under Cal. Ins. Code §790.03, which prohibits unfair claims settlement practices, including unreasonably delaying or denying claims. If your insurer acts in bad faith, you may have a separate legal claim for bad faith damages beyond your policy limits. But reaching that threshold is a high bar, and most disputes resolve through negotiation or arbitration without a bad-faith finding.
Having an attorney who understands the UIM process in California, and who can document and present your damages in a way that survives insurer scrutiny, makes a measurable difference in how these claims resolve.
Making Sure You Actually Have This Coverage on Your Policy
Many drivers do not know whether they have UIM coverage until they need it.
How to find out:
- Pull your declarations page (the summary sheet that comes with your policy renewal). Look for lines that say "Uninsured Motorist" and "Underinsured Motorist" with a dollar-limit next to each.
- If you do not see UIM coverage, check whether you signed a written rejection at the time you bought the policy. Under Cal. Ins. Code §11580.2, insurers must offer UM/UIM coverage and any rejection must be in writing. If you did not sign a rejection, you should have coverage.
- Call your insurance agent and ask directly: "Do I have underinsured motorist coverage, and what is the limit?"
California requires every auto insurer to offer underinsured motorist coverage, but you can reject it in writing under California Insurance Code §11580.2.
What limit should you carry?
That depends on your financial situation, your assets, and your risk tolerance. As a general principle, your UIM limit should be at least equal to your liability limit, and ideally high enough to cover a serious injury that sidelines you from work for an extended period. Given that California's minimum limits are still only $30,000 per person, a driver who hits you at a red light may only have enough to cover a fraction of a serious injury. Carrying $100,000 or $250,000 in UIM coverage costs relatively little in additional premium and can make an enormous difference if you are ever seriously hurt.
What If the Accident Happened While You Were Working?
If you were driving for work when the accident happened, whether as a delivery driver, a fleet driver, or simply running a work errand, you may have both a personal injury claim and a workers' compensation claim running simultaneously.
Workers' compensation covers your medical treatment and a portion of your lost wages under Cal. Lab. Code §3600 regardless of fault. But the workers' comp insurer will likely assert a lien against any third-party or UIM recovery you receive. Managing both claims together, and ensuring the lien does not consume your entire UIM recovery, requires coordinating the two cases carefully.
If this describes your situation, the personal injury and workers' compensation teams at Nordanyan Law handle both tracks of these cases together. The cross-claim situation is one of the highest-value scenarios we see, precisely because most attorneys only handle one side or the other.
How Nordanyan Law Handles UIM Claims
We've recovered over $150,000,000 for injured workers and accident victims in Southern California. UIM claims are not simple insurance paperwork exercises. They require full documentation of damages, a strategic approach to the consent process, and a willingness to take a lowball offer to arbitration or litigation if necessary.
We handle the consent notice to your insurer, the damage documentation, the negotiation with your own insurer's adjuster, and arbitration preparation if the claim does not resolve fairly. From the first call to the final resolution, you do not pay us anything unless we recover for you.
"Every injured worker deserves the same quality of legal representation as any corporation. That is the principle this firm was built on." That principle applies equally to accident victims facing an insurer, whether it is the other driver's carrier or their own.
If the at-fault driver's coverage is falling short of your actual damages, call (818) 794-9947 for a free consultation. No fee unless we win. Available in English and Spanish.
Frequently Asked Questions
What is underinsured motorist coverage in California?
Underinsured motorist (UIM) coverage is a type of auto insurance you buy on your own policy that pays the gap between what the at-fault driver's liability insurance covers and your actual damages, up to your UIM policy limit. California Insurance Code §11580.2 requires every insurer to offer it, but drivers may reject it in writing.
What happens if the at-fault driver's insurance isn't enough to cover my injuries?
If the at-fault driver's policy limits are lower than your total damages, you can file a UIM claim with your own insurer for the difference. You must first exhaust the at-fault driver's coverage by accepting their policy-limits settlement, with your own insurer's consent, before the UIM claim kicks in.
How do I file a UIM claim in California?
Notify your own insurer of the accident as soon as possible. Before accepting the at-fault driver's settlement, ask your insurer for consent in writing. Once you accept the at-fault driver's payment with consent, submit a UIM claim to your own insurer with all documentation of your damages, including medical records, bills, lost wage evidence, and any expert opinions on future treatment or disability.
Is underinsured motorist coverage required in California?
UIM coverage is not required, but insurers are required to offer it. If you did not sign a written rejection of UIM coverage when you purchased your policy, you likely have it. Check your declarations page or call your insurer to confirm.
Can my insurer deny my UIM claim?
Yes. Your own insurer can dispute the extent of your injuries, the value of your claim, or whether procedural requirements were met, such as the consent requirement. If the claim is wrongly denied, you may have remedies under California's bad-faith insurance laws under Cal. Ins. Code §790.03, but documenting your claim thoroughly and following the required steps is the first line of defense.
What are California's current minimum auto liability limits?
Effective January 1, 2025, California's minimum auto liability limits are $30,000 per person and $60,000 per accident for bodily injury, plus $15,000 for property damage, under Cal. Veh. Code §16056, as updated by SB 1107. These minimums are often insufficient for serious injuries, which is why UIM coverage matters.
How long do I have to file a UIM claim in California?
The California statute of limitations for personal injury lawsuits is generally two years from the accident date under Cal. Code Civ. Proc. §335.1. However, your UIM policy may impose shorter internal notice or claim-filing deadlines. Review your policy carefully, and consult an attorney promptly if you are approaching any deadline.
What if I share fault for the accident?
California uses a pure comparative fault system. If you are found partially at fault, your damages, including any UIM recovery, are reduced proportionally by your percentage of fault. Your own insurer may argue comparative fault to reduce its UIM payout, even after the at-fault driver's insurer has already paid its limits.
Does UIM coverage apply in hit-and-run accidents?
Hit-and-run accidents typically fall under uninsured motorist (UM) coverage rather than UIM coverage, because the at-fault driver is unidentified rather than underinsured. California Insurance Code §11580.2 addresses both. The specific rules for hit-and-run claims, including physical contact requirements, are worth reviewing with an attorney before assuming which coverage applies.
What if the accident happened while I was on the job?
If you were hurt in a car accident while performing work duties, you may have both a workers' compensation claim and a personal injury / UIM claim. The two claims can coexist, but the workers' compensation insurer will likely assert a lien against your UIM recovery. Coordinating both claims requires handling them together to protect your net recovery.
Reviewed by Minas Nordanyan, CA Bar No. 296806. Last legal review: July 2026. This article is for general informational purposes and does not constitute legal advice for your specific situation. Consult a licensed California attorney to evaluate your claim.