Uninsured motorist claims: consent to settle, arbitration and proof

A claim under your own uninsured or underinsured motorist coverage is adversarial because, in substance, your insurer steps into the shoes of the driver who hurt you. You are not asking it to pay a bill. You are asking it to pay what the other driver would owe if that driver had enough insurance, so it will test your account of fault, your medical evidence and your damages as that driver's insurer would. Most of the friction comes from five places: proof, the consent-to-settle clause, the exhaustion rule for underinsured claims, arbitration, and deadlines that can be shorter than a lawsuit's.

This article explains each step in order, with statutes and court decisions from California, Florida and Texas as worked examples of how states differ. Wording in your own policy and the law in your own state decide your claim, so treat these as maps, not rulings.

Why your own insurer is your opponent

Ordinarily you and your insurer are on the same side: you pay premiums, it pays your covered losses. Uninsured motorist (UM) and underinsured motorist (UIM) coverage is a first-party claim that works differently, because the amount it owes is defined by what another person would owe you. Florida's statute describes the coverage as protecting insureds who are "legally entitled to recover damages from owners or operators of uninsured motor vehicles because of bodily injury, sickness, or disease, including death." The Florida UM statute (2026 edition) has that wording in subsection (1).

"Legally entitled to recover" is a tort standard. It means the other driver must have been at fault, you must have been hurt, and your damages must be a number a court or arbitrator would accept. Your insurer is entitled to dispute each element. Texas is explicit about what that means. In Brainard v. Trinity Universal Insurance Co., 216 S.W.3d 809 (Tex. 2006), the state's Supreme Court held that the UIM insurer is under no contractual duty to pay benefits until the insured obtains a judgment establishing the liability and underinsured status of the other motorist, and that neither a settlement with the other driver nor that driver's admission of liability establishes UIM coverage. The court noted a jury could find the other motorist was not at fault, or award damages that do not exceed the other driver's liability insurance. The opinion is available from the Harvard Caselaw Access Project. That is Texas law specifically; other states may treat the point differently, but the posture is similar nearly everywhere.

None of this means the adjuster is acting in bad faith. It means the adjuster's job is to value the claim the way the defense would. If an insurer unreasonably delays or denies a valid claim, state unfair claims practices rules and, in some states, bad faith remedies apply. Florida's statute, for example, provides that damages recoverable from a UM carrier in a bad-faith action under section 624.155 include the total amount of the claimant's damages, including any amount above the policy limits. A licensed attorney in your state is the person to ask about that route.

What you have to prove

Every UM or UIM claim has three parts. Collect evidence for each from the first day.

The third element is easy to underestimate. In California, "uninsured motor vehicle" is defined to include a vehicle where there is no applicable bodily injury liability insurance or bond, and also one where an insurer exists but "denies coverage thereunder or refuses to admit coverage thereunder except conditionally or with reservation." (California Insurance Code 11580.2; current text is on FindLaw, updated to January 1, 2026.) So a carrier that says "we are investigating" or "we accept subject to a reservation of rights" can already put you in UM territory in that state. In another state, the same letter might not.

How common is the situation? The Insurance Research Council estimated in a 2025 study that 15.4 percent of U.S. motorists, more than one in seven, were uninsured in 2023, with state rates ranging from 5.7 percent in Maine to 28.2 percent in Mississippi (III summary of the IRC data). The IRC measures this from the ratio of UM claims to bodily injury claims, so it counts people who actually produced claims.

Proof of fault is its own challenge if you have no independent evidence. Our article on hit-and-run and phantom vehicle claims: the physical contact rule covers the situation where the other driver cannot be identified.

How a UM or UIM claim proceeds, step by step

1. Report the crash and give notice of a UM claim. Call the police and your insurer. Ask the insurer to open a UM or UIM claim in writing and note the date. Policies set notice duties, and the clock for some deadlines starts at the crash.
2. Identify the other driver's coverage. Get the other insurer's name and policy number or learn that none exists. Ask the other insurer for its coverage position in writing.
3. Treat and document. Keep every record. Gaps in treatment are the first thing an adjuster points to.
4. Cooperate with reasonable requests. Policies require you to provide medical releases, wage records and sometimes a recorded statement or an examination. California's statute, for instance, lets the insurer demand wage-loss information or medical record releases (subdivision (o)) and requires the insured to provide them within set days after request, or the arbitration can be delayed.
5. Present a demand. Your demand sets out liability, damages and the amount you seek, with exhibits.
6. Negotiate or move to the dispute stage. If you disagree on the value, your policy will provide for arbitration, litigation or both.
7. Finish with a payment and a release that deals with your UM claim only. Do not sign anything that waives other claims without understanding it.

For the typical timelines insurers must meet, the NAIC's model claims regulation (Model 902) is a useful benchmark: its text requires an insurer to acknowledge a claim within 15 days of notice and to accept or deny a first-party claim within 21 days after receiving properly executed proofs of loss, with some extensions allowed. States adopt their own versions, so check your state's rule or the NAIC model. Our guide to how fast an insurer must respond to your claim: state time limits lists them by state.

The consent-to-settle clause

Most UM/UIM endorsements say the coverage does not apply if you settle with the at-fault driver without the insurer's written consent. The reason is subrogation. After your insurer pays you, it normally has a right to recover from the at-fault driver. If you release that driver for a small sum, you may have destroyed the right.

The risk is highest in underinsured claims, where the at-fault driver has insurance. The at-fault driver's insurer offers its policy limits, you are tempted to take the money, and your own insurer has not yet agreed.

States handle this in three broad ways.

Prejudice rule. In Hernandez v. Gulf Group Lloyds, 875 S.W.2d 691 (Tex. 1994), the Texas Supreme Court held that an insurer may escape liability on a settlement-without-consent exclusion only when it is actually prejudiced by the settlement. There, the family had settled with a 19-year-old driver whose only asset was a $25,000 liability policy, and the insurer stipulated it had lost nothing because the driver had no other assets. A copy of the decision is on the Caselaw Access Project. Texas is not every state, and the court's reasoning depended on those stipulated facts.

Statutory procedure. Florida's subsection (6) sets a clock. If you agree to settle with the liability insurer and the settlement would leave an underinsured claim, you must give written notice of the proposed settlement by certified or registered mail to each UIM insurer. That insurer then has 30 days to authorize the settlement or preserve its subrogation rights. If it authorizes, or fails to respond in the 30 days, you may sign a full release without prejudice to your UIM claim. If it refuses permission, it must pay you the amount of the written offer within the 30 days, and it can then pursue the other driver for that sum. The UIM insurer gets a credit equal to the other driver's full policy limits, even if you settled for less, so a discounted settlement comes out of your pocket. The text is in the same Florida statute.

Policy-driven rules. In states without a statute, the policy language and case law control. Ask the insurer in writing for its position before you accept any offer.

California handles the UM side differently. Its statute says an insured entitled to recover under UM coverage shall be reimbursed "without being required to sign any release or waiver of rights" under other applicable insurance, and payment cannot be delayed or made contingent on decisions about liability or distribution of loss costs under other bodily injury liability insurance. For UIM claims, the statute makes the coverage inapplicable until the other driver's policy limits are exhausted by payment of judgments or settlements, and requires proof of that payment to be submitted.

A worked example of releasing too soon

Say you have $100,000 in UIM coverage and a driver with a $25,000 policy rear-ends you. Your damages are well above that. The driver's insurer sends a $25,000 check and a release. If you sign without telling your insurer, a policy with a strict consent clause may let it deny the UIM claim. If the driver has no assets, some courts would ask whether the insurer was actually prejudiced, as Texas does; others apply the clause as written. If the driver owns a house or was working at the time and had an employer who could be liable, the insurer can argue that the release destroyed a valuable recovery right.

The simple protocol: send your insurer a written request for consent, with the offer and the release attached, by a method that proves delivery. Wait for the reply, or the statutory period if your state has one. Before signing, ask a lawyer whether the release's wording also releases anyone else, such as an employer or a vehicle owner.

The exhaustion rule for underinsured claims

Underinsured claims have an extra precondition in many states: you must first collect, or at least be able to collect, from the at-fault driver's liability coverage. Two forms are common.

• Strict exhaustion. California's statute provides that UIM coverage does not apply to any bodily injury until the limits of liability policies applicable to all insured vehicles causing the injury have been exhausted by payment of judgments or settlements, and proof of the payment is submitted to the UIM insurer.
• Credit for the limits. Florida lets the UIM insurer take a credit against total damages equal to the other driver's liability limits, even if you settled for less than those limits.

The practical lesson is the same in both: settling with the at-fault insurer for less than its limits does not increase what your own insurer pays. The shortfall can come out of your recovery. Our companion article on underinsured motorist coverage: difference-in-limits vs add-on states shows how the arithmetic works under different state approaches, and underinsured motorist claims: offset vs excess and consent to settle covers the offset question in more detail.

Arbitration: how it works in practice

Many UM policies resolve disputes over fault and damages by arbitration instead of a jury. California requires it. Subdivision (f) of the statute requires the policy to provide that whether you are legally entitled to recover damages, and the amount, will be decided by agreement or, if you disagree, by arbitration before a single neutral arbitrator. An award is not conclusive in a later action between you and the uninsured motorist, which means the arbitration decides your rights against your insurer without necessarily binding the driver. If you have a workers' compensation claim, the arbitrator may not proceed until your physical condition is stationary and ratable.

In practice, an arbitrated UM claim looks like a streamlined lawsuit:

1. One side sends a written demand for arbitration.
2. The parties pick a neutral arbitrator or use the one named in the policy or by a provider organization.
3. Discovery runs on a compressed schedule, with medical records, depositions of the injured person and often a medical examination.
4. A hearing takes place with exhibits and testimony, usually less formal than court.
5. The arbitrator issues an award, which is binding or non-binding depending on the policy and state law.

Who pays the arbitrator's fees depends on the policy and the arbitration rules it names. If your policy has no arbitration clause, the dispute goes to court. Other states differ: some make arbitration optional, some bar mandatory arbitration, and some policies make it binding only if both sides agree. Our article on arbitration and mediation in auto insurance disputes compares the options.

Deadlines that can be shorter than you think

A UM claim has two clocks: the policy's own time limits, and the statute of limitations.

California's subdivision (i) shows how tight the contract clock can be. No cause of action accrues under the UM coverage unless within two years from the date of the accident one of three things happens: suit for bodily injury has been filed against the uninsured motorist, the parties have agreed on the amount due, or the insured has formally started arbitration by written notice sent to the insurer by certified mail, return receipt requested. Any arbitration started this way must generally conclude within five years. The statute includes some protection for people who do not have lawyers: subdivision (k) requires an insurer with a pending claim to notify its insured in writing of the statute of limitations at least 30 days before it expires, though not if the insurer knows the insured has an attorney.

Other states use different periods, and the date the clock starts (the crash, the tortfeasor's payment, the insurer's denial) varies. Our articles on uninsured motorist claim deadlines: when the clock starts and statutes of limitations for car accident claims give the broader picture. If you have been injured by an uninsured or underinsured driver, put the earliest possible date on your calendar and treat it as a deadline until a lawyer or your state insurance department tells you otherwise.

A documentation checklist

• Police report number and the officer's name
• Photos of vehicles, the scene, your injuries and any skid marks or signs
• Names and contact details of witnesses
• The other driver's name, license, plate, VIN and insurer if any
• Letters from any insurer confirming, denying or reserving rights on coverage
• A treatment log with dates, providers and the explanation of benefits for each
• Pay stubs or tax returns for lost wages, plus a note from your employer
• A diary of symptoms and limits on daily activities
• Every letter and email with your own insurer, and the date and summary of every call
• Your policy declarations page and endorsements, in particular the UM/UIM limits and any selection form

The after-accident checklist and information form tool covers what to gather at the scene.

Common questions

Do I need a lawyer for a UM claim?

Small, clear claims are sometimes settled directly. Once the injury is significant, liability is disputed or the insurer raises consent, arbitration or limitation issues, many people consult a licensed attorney in their state, because the policy and statute interact in ways that are easy to get wrong. Many attorneys take injury cases on contingency, but fees vary.

Can I settle with the uninsured driver myself?

You can, but a release can end your UM claim if your policy requires the insurer's consent or if the release destroys the insurer's recovery right. If the driver truly has nothing, a settlement is rarely valuable. Notify your insurer before you sign.

Does a UM payment have to be repaid to Medicare or a health plan?

It can. Federal Medicare regulations define "liability insurance" to include uninsured and underinsured motorist insurance, and Medicare may recover conditional payments from a settlement or award (42 CFR 411.50; CMS recovery overview). A health plan may also have reimbursement rights. See MedPay or health insurance: who pays first after a crash.

What if my insurer offers far less than my damages?

You can ask for a written explanation of the valuation, submit more evidence and move to arbitration or suit when the policy allows. Our article on when your own insurer lowballs an uninsured motorist claim covers negotiation. Complaints about claim handling can go to the state insurance department.

Key takeaways

• A UM or UIM claim is first-party but defended like a liability claim: you must prove the other driver's fault, your damages and the lack or shortfall of coverage.
• The consent-to-settle clause can forfeit your UIM claim if you release the at-fault driver first. Some states, such as Florida, set a written-notice procedure with a 30-day clock; Texas requires the insurer to show prejudice.
• Underinsured claims often require exhaustion of the other driver's limits or give your insurer a credit for them, so settling low costs you.
• Arbitration is mandatory in some states, such as California, and optional or absent elsewhere, so read your policy before demanding it.
• Contract deadlines can be as short as two years from the crash, and they differ by state; calendar the earliest date and check your state's rule.