Uninsured and underinsured motorist coverage

This article is for educational purposes only and does not constitute legal advice. Laws vary by state, and you should consult with a qualified attorney about your specific situation.

You got hit by another car, and when you tried to file a claim against their insurance, you found out they don't have any. Or worse, they do have insurance, but their coverage limits are so low they won't come close to covering your medical bills and car damage. Now you're thinking the worst: am I going to be stuck paying for this myself? Did I just get blindsided by someone else's negligence with no way to recover?

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This is one of the most common fears after an accident, and it's the moment when a lot of people start to panic. The good news is that if you saw any value in paying for uninsured motorist coverage or underinsured motorist coverage on your own policy, you're protected. And even if you didn't get that coverage, you have options. Understanding what UM and UIM coverage actually does and how it works takes a lot of the dread out of this scenario.

The Problem That UM and UIM Coverage Solves

Before we get into how these protections work, it helps to understand why they exist at all. The premise is straightforward: the law requires drivers to have liability insurance so that when they cause an accident, the other person is covered. That's the theory. The reality is messier. About one in eight drivers nationally operate without any insurance at all. In some states, the number is much higher. And even among drivers who do have insurance, many carry liability limits that are dangerously low—sometimes as little as the state minimum, which in many places means just twenty-five or thirty thousand dollars of coverage.

Now imagine you're hit by one of those uninsured or underinsured drivers. They caused the accident, they're clearly at fault, but there's no third-party insurance to claim against, or the insurance they do have won't cover your actual damages. The insurance system is supposed to protect you from this exact scenario. That's where uninsured motorist coverage and underinsured motorist coverage come in. They're not protections against someone else's insurance company. They're protections within your own policy that kick in when the other driver failed to carry adequate insurance or didn't carry any at all.

This is a distinction a lot of people miss. You're not waiting for the other driver to have insurance or hoping their insurance is adequate. You're covered by your own policy. That's the entire point.

What Uninsured Motorist Coverage Does

Uninsured motorist coverage, usually abbreviated as UM, protects you when the other driver has zero insurance—not underinsured, but completely uninsured. When you file a claim under your UM coverage, you're essentially claiming against your own policy as if the other driver had liability insurance but their insurance company was paying your claim.

Here's how it works in practice. You're hit by an uninsured driver. Your car is damaged, and you're injured. You report the accident to your insurance company just as you normally would, but you also notify them that the other driver doesn't have insurance. Your insurance company then handles your claim under your UM coverage. They investigate the accident to determine fault, just like a third-party claim would work. They establish that the other driver was at fault. They then authorize repairs to your vehicle and process your medical bills and other damages as if they were paying a liability claim on the other driver's behalf.

The mechanics of how UM coverage works are crucial to understand. You're not suing the other driver directly—though you could, and you might end up doing that anyway if they have significant assets. Instead, your insurance company is stepping into the shoes of the other driver's insurance company and providing you the coverage they should have carried. This is why UM coverage exists: to protect you from the bad decision made by someone else to drive without insurance. You've been responsible and paid your premiums for UM protection. When you need it, it's there.

One important detail: most UM claims include a deductible, just like collision coverage does. You'll typically pay that deductible out of pocket, though some policies waive it if the accident was clearly the other driver's fault. Check your specific policy to see how your deductible works with UM coverage.

Underinsured Motorist Coverage: The Coverage Gap

Underinsured motorist coverage, usually abbreviated as UIM, is slightly different. It's not for drivers with zero insurance. It's for drivers who have insurance but not enough of it. You get hit by someone whose fault is clear, their liability insurance will cover some of your damages, but not all of them. The gap between what their insurance will pay and what your damages actually total is where underinsured motorist coverage steps in.

Let's use a concrete example. The other driver is at fault. They have liability insurance with a twenty-five thousand dollar limit. Your medical bills, lost wages, pain and suffering, and car damage add up to seventy thousand dollars. Their liability insurance pays out their full twenty-five thousand dollar limit. You still have forty-five thousand dollars in uncompensated damages. If you have underinsured motorist coverage with a fifty thousand dollar limit, you file a claim with your own insurance, and your UIM coverage covers the forty-five thousand dollar gap.

This is where a lot of people's confusion comes in. They think they're being greedy or litigious by filing against their own insurance when the other driver already has insurance. They're not. That other driver's insurance covered what they were required to carry. Your underinsured motorist coverage covers the rest of what you actually need because the other driver didn't buy enough protection. It's not a windfall; it's coverage you paid for that exists precisely for this scenario.

Understanding what an insurance defense attorney looks for can help your own lawyer anticipate the strategies the other side will use.

The Key Difference: UM vs. UIM

The distinction between these two types of coverage is simple, but it matters because it determines which coverage you file under and what you're eligible to recover. Uninsured motorist coverage applies when the other driver has absolutely no liability insurance—they're driving with nothing. Underinsured motorist coverage applies when they have some insurance, but the liability limits are lower than your actual damages.

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In practice, what matters most is that you know whether you have these coverages and what your limits are. When you have your auto insurance policy, look at your declarations page—that's the summary that lists what coverages you carry and what the limits are. UM coverage will be listed as a separate line item with a limit amount, usually something like twenty-five thousand, fifty thousand, or one hundred thousand per person, and sometimes a higher limit per accident. Same with UIM. If you don't see either of these listed, you likely don't have them, which brings us to the concerning part.

Not all policies include UM and UIM coverage automatically. In some states, it's included by default, but in others, you have to request it. In a small number of states, insurance companies are allowed to offer it at a reduced benefit level unless you affirmatively request the full amount. It's worth a phone call to your insurance company to confirm what you actually have. If you don't have it, the conversation should be about why not and whether you should add it, because statistically, the chance of being hit by an uninsured or underinsured driver over the course of your driving life is not zero.

Stacking and Non-Stacking Policies

Here's where UM and UIM coverage gets a little legally technical, but it's important to understand because it affects how much coverage you actually have. Some policies allow something called stacking, and some don't.

Stacking means you can combine coverage limits across different vehicles on your policy. If you insure two cars under the same policy, and each car has fifty thousand dollars in UM coverage, stacking would allow you to claim against one hundred thousand dollars total if you're injured. Non-stacking means you can only recover up to fifty thousand dollars regardless of how many vehicles are on the policy.

Stacking can also apply across household members. If you and a family member both have separate car insurance policies, stacking might allow you to combine your UM limits. Again, this varies by state. Some states allow it, some don't. Some insurance companies offer it as an option you can elect at a higher premium.

Why does this matter? Because if you have a serious injury and your damages exceed your UM or UIM limit, having stacking available could mean the difference between having adequate coverage and coming up short. It's another reason to talk to your insurance agent about your specific policy. You want to know not just what coverage you have, but whether you can stack it.

An insurance defense attorney represents the insurance company's interests, which is why having strong legal representation on your side matters.

How to File a UM or UIM Claim

When you need to file a claim under your uninsured or underinsured motorist coverage, the process is similar to filing any other insurance claim, but there's a key psychological difference: you're filing against your own insurance company, not the other driver's. This is important to get your head around because it can feel counterintuitive.

You report the accident to your insurance company. You tell them the other driver doesn't have insurance, or that they have insurance but the liability limits won't cover your damages. Your insurance company will then open a UM or UIM claim file. The claims adjuster assigned to your case will investigate the accident to establish fault. This is essential: UM and UIM coverage requires that the other driver be at fault. If you were partially responsible for the accident, some states will reduce your recovery proportionally to your fault. Other states won't cover you at all if you're more than fifty percent at fault. This varies by state law, which is why the specifics of how the accident happened matter.

The investigation process works much like any other liability claim. The adjuster will get the police report, speak with witnesses if there are any, review photographs, and build a file showing that the other driver caused the accident. Once they've established that the other driver was at fault and the accident was covered under your policy, they'll begin processing your damages claim.

If you were injured, you'll submit medical records and bills. If you lost wages, you'll document that. If your car was damaged, you'll provide repair estimates or declare it a total loss. The adjuster will evaluate everything and make an offer. If you think the offer is too low, you can negotiate, just as you would in any insurance claim. If you have an attorney involved, they can help with that negotiation.

Hit-and-Run: A Special UM Scenario

There's one scenario where UM coverage becomes even more important: hit-and-run accidents. If you're hit by a driver who leaves the scene and you never identify them, you can't file a third-party claim against their insurance because you don't know who they are. In this situation, your UM coverage can apply—but only if you can provide some evidence that a hit-and-run actually occurred.

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This is where a police report becomes crucial. If you hit and report a hit-and-run to the police, file that report immediately. Get the report number. Provide that to your insurance company. Your insurer will then open a UM claim. The investigation will focus on whether there's credible evidence of a hit-and-run—maybe there are witnesses, maybe there's damage to your vehicle that's consistent with being hit by another car, maybe there are camera footage of the incident. You won't be able to prove who the other driver was, but UM coverage in hit-and-run cases is specifically designed to apply when you're hit by an unknown driver.

If the process becomes adversarial, your insurance attorney can handle communications with the company and protect your interests throughout the dispute.

Some states and some policies have different rules about hit-and-run claims under UM coverage. Some require independent evidence of the collision. Some have higher deductibles. It's worth discussing this with your insurance company upfront if you're in an area where hit-and-runs are common, so you know what your coverage actually includes.

When the opposing insurance defense attorney challenges your claim, your lawyer should be prepared with evidence and documentation.

What to Do If You Don't Have UM or UIM Coverage

If you get hit by an uninsured or underinsured driver and you don't have these coverages on your policy, your options are more limited, but you're not completely out of luck. The path forward is harder, but it exists.

You can pursue a claim directly against the other driver. This means filing a lawsuit or going to small claims court to try to get a judgment against them personally. The problem is that judgment and collection are two different things. You can win in court, get a judgment saying they owe you fifty thousand dollars, and then discover that they don't have fifty thousand dollars in assets, a steady job with wages you can garnish, or any real way to pay. Collecting a judgment from someone who was driving uninsured is often difficult because they likely don't have significant assets.

You might be able to recover through your own medical insurance if you were injured. Your health insurance will pay your medical bills as they're incurred. This doesn't cover your car damage or pain and suffering, but it does cover treatment. Some health insurance policies have a subrogation clause, meaning they expect you to repay them if you recover money from another source. So you'd still pursue the other driver, but some of what you recover would go to your health insurer.

The realistic answer is that if you're uninsured against UM and UIM risks and you hit an uninsured or seriously underinsured driver, you'll likely absorb at least some of the losses yourself. This is a powerful argument for having these coverages when you shop for insurance. They're not the most expensive add-ons, and the protection they provide is genuine.

The Peace of Mind Factor

Understanding UM and UIM coverage, or realizing you don't have it and adding it, is less about preparing for catastrophe and more about giving yourself options. The person who hit you made a poor decision—driving without adequate insurance. You can't control that. But you can control whether you'll be protected if it happens to you.

If you have UM and UIM coverage, you're in a position where an accident caused by an uninsured or underinsured driver is handled through a normal insurance process. It's not pleasant, it's not what you wanted, but it's manageable. Your insurance company handles the investigation, your medical bills get paid, your car gets repaired, and if there's pain and suffering, you recover for that too. You're not chasing someone down trying to collect from them personally. You're not lost in a legal maze trying to figure out how to recover damages when the other driver has nothing.

If you don't have this coverage, start there. Call your insurance company today and ask whether you have UM and UIM coverage and what your limits are. If you don't have it, ask what it would cost to add it. In most cases, the premium is surprisingly modest—sometimes it's just a few dollars a month. Given that roughly one in eight drivers don't have insurance, the math is straightforward. The cost of adding the coverage is almost certainly less than what you'd lose if you were hit by an uninsured driver and didn't have protection.

What Happens Next

If you're in the unfortunate position of having been hit by an uninsured or underinsured driver, the next step is to file a claim with your insurance company and explain that the other driver's insurance is insufficient or nonexistent. You'll be assigned a claims adjuster. They'll investigate. They'll keep you updated as the process moves forward. If you have significant injuries or if the claim is complex, this is a good time to consult with a personal injury attorney. Many attorneys will review your claim situation at no cost and advise you on whether you're being treated fairly, whether your settlement offer is reasonable, and whether you need representation to negotiate further.

The system is designed to protect you in exactly this scenario. You did the right thing by having insurance. You probably did the right thing by carrying UM and UIM coverage, even though it felt unnecessary when you signed up for it. Now that you need it, it's there. That's exactly what it's supposed to do.

Learn Injury Law is an educational resource. We do not provide legal advice and we are not a law firm. The information in this article is general in nature and may not apply to your specific situation. Laws regarding uninsured and underinsured motorist coverage, claim procedures, and coverage requirements vary significantly by state. Some states require UM/UIM coverage by default, while others make it optional. Some jurisdictions have unique rules regarding hit-and-run claims, stacking, and comparative fault that affect how these coverages apply. If you have been injured in a car accident, especially one involving an uninsured or underinsured driver, we encourage you to consult with a qualified personal injury attorney or insurance professional licensed in your jurisdiction.