The Driver Who Hit You Had No Insurance. Your Own Policy May Be the Source of Compensation California Law Requires Your Insurer to Offer.

Uninsured and Underinsured Motorist Claims in California

California Insurance Code section 11580.2 governs uninsured motorist (UM) and underinsured motorist (UIM) coverage. Despite California's mandatory insurance law, approximately one in six California drivers is estimated to be uninsured — making UM/UIM coverage one of the most practically important provisions in any California auto policy.

When the at-fault driver has no liability insurance, the injured victim's own UM coverage steps into the position of the absent insurer. The victim's own insurer evaluates liability — whether the uninsured driver was at fault — and damages, just as an adverse insurer would in a conventional liability claim. The insurer then pays the covered damages up to the UM policy limits.

UIM coverage operates differently. It applies when the at-fault driver has some liability insurance, but those limits are insufficient to cover the full value of the claim. California UIM coverage pays the gap between what the at-fault driver's liability policy paid and the victim's UIM limits. If a victim has $100,000 UIM limits and the at-fault driver's $15,000 policy has been exhausted, UIM coverage pays up to $85,000 more.

A critical distinction from a standard liability claim: in a UM/UIM claim, the victim is dealing with their own insurer — not a stranger's. Despite this, California law is clear that the insurer's duty of good faith and fair dealing applies fully to UM/UIM claims. An insurer that unreasonably undervalues or delays a UM/UIM claim faces potential bad faith liability under Insurance Code section 790.03.

What to Do After an Accident with an Uninsured Driver

Uninsured motorist claims have specific procedural requirements — including prompt notice to your insurer and restrictions on settling with the at-fault driver without the insurer's consent. Acting correctly from the outset protects coverage.

1. 1
   Call 911 and Document the Scene

   A police report is essential — it establishes the at-fault driver's identity, confirms the lack of insurance, and creates an official record of the accident. Photograph both vehicles, the damage, the license plate, and the scene. Get witness names and contact information. Without a police report, establishing the other driver's existence and fault in a UM claim can be complicated.

2. 2
   Collect All Available Information from the At-Fault Driver

   Even if the driver is clearly uninsured, collect everything: full name, address, driver's license number, vehicle registration, license plate, and any insurance cards they carry — even expired ones. The driver's identity is necessary to file the UM claim. In hit-and-run cases with no identified driver, special UM rules apply.

3. 3
   Seek Medical Attention

   Get prompt medical treatment and document all injuries. Your own insurer will evaluate the UM claim with the same scrutiny it would apply to any liability claim — medical gaps and inconsistencies will be used to minimize claim value. Continuous, well-documented treatment is essential.

4. 4
   Notify Your Own Insurer Promptly

   Most UM/UIM policies require prompt notice of the accident as a condition of coverage. Notify your insurer as soon as possible — even if the at-fault driver's insurance status is not yet confirmed. Delayed notice can give your insurer a basis to contest coverage. Review your policy for the specific notice requirements.

5. 5
   Do Not Settle With the Uninsured Driver Without Insurer Consent

   If you settle directly with the uninsured at-fault driver and sign a release, you may release your UM claim against your own insurer. California law requires you to notify your insurer and obtain written consent before settling with an uninsured tortfeasor. Settling without consent can void UM coverage — even if the settlement amount was inadequate.

6. 6
   Understand That Disputes Go to Arbitration

   UM/UIM disputes in California are typically resolved through binding arbitration — not a trial against your insurer. Your policy specifies the arbitration process (typically a single neutral arbitrator or a three-arbitrator panel). Arbitration has its own procedures, discovery rules, and timelines. An attorney experienced in UM arbitration can present the full value of the claim in that forum.

7. 7
   Watch for Bad Faith Conduct by Your Insurer

   Your insurer owes you the same duty of good faith it owes any claimant. If your insurer unreasonably delays investigation, makes a lowball offer without adequate evaluation, or refuses to pay a valid claim, it may be acting in bad faith under California Insurance Code section 790.03. A licensed attorney can assess whether the insurer's conduct warrants a bad faith claim separate from the underlying UM dispute.

Your Legal Rights in a California Uninsured Motorist Claim

The Right to UM/UIM Coverage Unless You Rejected It in Writing

California Insurance Code section 11580.2 requires all auto liability policies issued in California to include UM bodily injury coverage at limits equal to the insured's liability limits — unless the insured rejected it in writing. If your insurer cannot produce a signed written rejection, you have UM coverage. Many insureds discover they have UM coverage they were unaware of when the need arises.

The Right to Good Faith Claims Handling

California's implied covenant of good faith and fair dealing requires your insurer to handle your UM/UIM claim fairly and promptly — the same obligation that applies to an adverse insurer handling a liability claim. Unreasonable delay, inadequate investigation, or a lowball offer without adequate basis may constitute bad faith. A successful bad faith claim can result in damages beyond the policy limits, including attorney's fees and punitive damages.

The Right to Arbitration of Disputed Claims

California Insurance Code section 11580.2(f) provides that disputes between an insured and their insurer over UM claims are resolved by arbitration. The arbitration is binding and typically covers both liability (fault) and damages. The insured and insurer each select one arbitrator, and those two select a third neutral. The majority controls the outcome.

How a UM/UIM Claim Is Evaluated

Your insurer acts as an adversary in evaluating a UM/UIM claim — even though it is your own insurer. Understanding this dynamic is essential to protecting the full value of the claim.

Liability evaluation. Your insurer determines whether the uninsured driver was at fault for the accident — applying the same negligence and comparative fault standards that would apply in a third-party liability claim. If the insurer disputes the uninsured driver's fault, that dispute goes to arbitration.

Damages evaluation. The insurer values medical expenses, lost wages, and pain and suffering using the same methodology an adverse insurer would use. Insurers frequently dispute the reasonableness and necessity of medical treatment, the extent of injury, and the causal connection between the accident and claimed conditions.

Policy limits cap. UM/UIM coverage pays up to the policy limits. If the policy limit is $100,000 and the claim value is $300,000, the UM coverage pays $100,000 — leaving the insured to pursue the uninsured driver directly for the balance (a practical challenge if the driver has no assets).

Offset for at-fault driver's coverage. In a UIM claim (where the at-fault driver had some insurance), the UIM coverage pays the gap — not the total damages. If the at-fault driver's $15,000 policy was paid, the UIM insurer pays from $15,000 up to the UIM limit, not from zero.

Insurance Considerations in Uninsured Motorist Claims

UM bodily injury coverage covers the injured victim's medical expenses, lost wages, and pain and suffering arising from injuries caused by an uninsured driver. It does not cover property damage to the vehicle.

Uninsured Motorist Property Damage (UMPD) is a separate, optional coverage that covers damage to the vehicle caused by an uninsured driver. UMPD is subject to a $250 deductible in California under Insurance Code section 11580.2(b)(3).

MedPay coverage pays medical expenses regardless of fault and can serve as a first-response payment source while the UM claim is pending. MedPay has no liability requirement — it pays regardless of who caused the accident.

Health insurance typically covers accident-related medical treatment. Health insurers may assert subrogation rights against any UM/UIM recovery — they want to be reimbursed for medical payments made. Managing lien holders is a key part of resolving UM/UIM claims.

Evidence That Matters in Uninsured Motorist Claims

The police report confirming the at-fault driver's identity and uninsured status is the foundation of the UM claim. In hit-and-run cases, the police report documenting the incident is essential for establishing the unknown-driver UM claim.

DMV records and insurance verification confirm the at-fault driver's uninsured status at the time of the accident — typically obtained through the California DMV or through the police report's insurance verification data.

Medical records and bills document the full scope of injury and treatment — your insurer will scrutinize them for causation gaps, pre-existing conditions, and treatment consistency. Thorough, continuous documentation is essential.

Wage loss documentation — pay stubs, employer letters, tax returns — establishes economic damages. UM/UIM insurers frequently require detailed documentation of lost wage claims.

Your own policy — the declarations page, UM/UIM coverage endorsement, and any rejection forms — defines the coverage available and the arbitration procedures that govern the dispute.