What uninsured motorist insurance does

Uninsured motorist (UM) insurance pays for your injuries and vehicle damage if you are hit by a driver who has no liability insurance. It also covers hit-and-run accidents where you cannot identify the other driver. This coverage protects you when the person at fault cannot pay for the harm they caused.

The coverage works like this: you file a claim with your own insurance company, not the other driver's. Your insurer then pays your medical bills, lost wages, and pain and suffering up to the limit you chose when you bought the policy. If your vehicle is damaged, uninsured motorist property damage (UMPD) covers repairs or replacement, though this is optional in most states and not all insurers offer it.

UM insurance is different from liability coverage. Liability pays when you injure someone else. UM pays when someone else injures you and cannot cover it themselves. You are essentially insuring yourself against other people's lack of insurance.

Key Takeaways

  • Uninsured motorist insurance covers your medical bills and vehicle damage when hit by an uninsured or hit-and-run driver, using your own policy limits rather than the other driver's.
  • Most states require you to carry UM coverage unless you actively reject it in writing, though the minimum amount varies by state.
  • Your UM limit should match or exceed your liability limit, because if you are hit by an uninsured driver, only your UM coverage will pay.
  • You can file a UM claim even while the other driver is unidentified, but you will need a police report documenting the hit-and-run.
  • UM claims often require negotiation with your own insurer, and disputes over fault or injury severity may lead to arbitration or small claims court.

When UM insurance actually pays out

UM insurance pays when three conditions are met: the other driver caused the accident, that driver had no liability insurance, and you suffered injury or property damage. The accident must be a collision—UM does not cover theft, vandalism, or damage from weather.

Hit-and-run accidents are the most common UM claim. You must report the accident to police and file a report within a set time (usually 30 days, but check your policy). Your insurer will ask for the police report number and any details you remember about the other vehicle. If you cannot provide a police report, most insurers will deny the claim, even if you are certain you were hit.

UM also covers accidents where the other driver is insured but their policy limit is too low to cover your damages. Some states call this underinsured motorist (UIM) coverage, which is a separate add-on. In other states, UM and UIM are combined into one coverage type. Check your policy to see which applies to you.

State requirements and what you must carry

Most states require UM coverage as part of a standard auto insurance policy. You can reject it, but you must do so in writing—straightforward not buying it is not enough. A few states (New Hampshire and Virginia among them) do not require UM, though insurers in those states may still offer it.

The minimum UM limit varies by state. Some states tie it to your liability limit (for example, your UM limit must equal your bodily injury liability limit). Others set a flat minimum, such as $25,000 per person and $50,000 per accident. These minimums are often lower than what you actually need.

Insurance agents and state insurance department websites list the minimum for your state. However, the minimum is rarely enough. If you are seriously injured, medical bills and lost wages can exceed $25,000 quickly. Most insurance professionals recommend carrying UM limits equal to your liability limits, or higher if you have significant assets to protect.

How to file a UM claim

Contact your insurance company as soon as possible after the accident. You will need to report the accident, provide a police report number (if available), describe what happened, and list your injuries and damages. Your insurer will assign a claims adjuster.

The adjuster will investigate whether the other driver was actually uninsured. They may request medical records, repair estimates, photos of the damage, and proof of lost wages. If the other driver is later found to have had insurance, your claim will be denied and you will need to pursue the other driver's liability coverage instead.

For hit-and-run claims, the police report is essential. Without it, most insurers will deny the claim. If you did not report the accident to police when ready, report it now and explain the delay. Some insurers will still accept a delayed report if you have other evidence (witness statements, traffic camera footage, damage photos with a timestamp).

Disputes over fault and injury severity

Your own insurer may dispute whether you were at fault for the accident, or whether your injuries are as severe as you claim. Unlike a liability claim against another driver, you cannot straightforward sue your own insurer in most cases. Instead, the policy usually requires arbitration—a private hearing where a neutral third party decides the dispute.

Arbitration is faster than court but less formal. You present evidence of the accident and your injuries; your insurer presents its evidence. The arbitrator then decides how much you are owed. The decision is binding on both sides, though some policies allow you to appeal to small claims court if the amount in dispute is below a certain threshold (often $5,000).

To strengthen your claim, gather medical records showing treatment for your injuries, receipts for vehicle repairs, photos of the damage, and any witness statements. If the other driver was cited by police, that citation helps prove fault. If you were cited, that does not automatically mean you lose—fault in a UM claim is determined by the policy language and the evidence, not by who got a ticket.

UM limits and how they interact with other coverage

Your UM limit is the maximum your insurer will pay for a single accident. If you chose a $50,000 limit and your damages total $80,000, you receive $50,000 and absorb the rest yourself (unless you can recover it from the uninsured driver in court, which is often not practical).

UM coverage does not stack automatically. If you have two vehicles on the same policy, each with $50,000 UM coverage, you cannot combine them into $100,000 for a single accident. However, some policies allow stacking if you request it, and some states require it. Ask your agent whether stacking is available and whether it would increase your premium.

If you have health insurance, your health insurance may pay your medical bills first, and UM coverage pays what health insurance does not cover. Some policies require you to exhaust your health insurance before UM pays anything. Read your UM policy to understand the order of payment.

When UM insurance does not explore

UM insurance does not cover accidents where you were at fault. It does not cover damage from weather, theft, or vandalism. It does not cover injuries to passengers in the other vehicle (that is what your liability coverage is for). It does not cover accidents involving commercial vehicles in some states, or accidents that occur outside the United States.

UM also does not explore if you were injured as a pedestrian or cyclist by an uninsured driver in some states, though others do cover pedestrian and cyclist injuries. Check your policy or ask your agent whether pedestrian and cyclist injuries are covered under your UM policy.

If you were driving someone else's vehicle with permission, you may be covered under that vehicle's UM policy, or under your own policy if you have non-owner coverage. The rules vary by state and by policy. If you regularly borrow a vehicle, ask the owner's insurer whether you are covered.

Frequently Asked Questions

Do I have to carry uninsured motorist insurance?

Most states require it unless you reject it in writing. A few states do not require it at all. Check your state's insurance department website or ask your agent. Even if your state does not require it, carrying UM is usually worth the cost, because uninsured drivers are common in most areas.

What if the other driver was insured but their policy limit was too low?

That is underinsured motorist (UIM) coverage, which is separate from UM in most states. UIM pays the difference between the other driver's limit and your damages. Some states combine UM and UIM into one coverage. Check your policy to see whether you have UIM coverage and what your limit is.

Can I sue the uninsured driver after my UM claim is paid?

Yes, but your insurer may have a right of subrogation—the right to recover what it paid from the uninsured driver. If you recover money from the uninsured driver later, you may have to repay your insurer. Ask your insurer about subrogation before you settle with the uninsured driver.

What happens if I cannot prove the other driver was uninsured?

Your insurer will investigate by checking state insurance records and contacting the other driver. If the other driver claims to have insurance but cannot produce proof, your insurer may still deny the claim unless you have strong evidence. A police report stating the driver was uninsured helps, but is not always conclusive.

Does my UM coverage explore if I was hit while parked?

Yes, if you have a police report documenting the hit-and-run. If you did not see the accident happen, report it to police when ready and provide any details (time of day, location, damage pattern). Without a police report, most insurers will deny the claim.