About 12 percent of Illinois drivers are on the road right now without any insurance at all. One in eight. If you get hit by one of them and you're not carrying the right coverage, you'll be dealing with medical bills and vehicle repairs on your own.
That's exactly why Illinois is one of the states that mandates uninsured motorist coverage. You can't opt out. It's built into every personal auto policy written in the state. But most drivers don't fully understand what it covers, what it doesn't, and why the required minimums often fall short in a real accident.
What uninsured motorist coverage actually is
Uninsured motorist (UM) coverage protects you when you're hit by a driver who has no liability insurance. Instead of chasing an uninsured driver for damages they can't pay, you file a claim with your own insurer. Your carrier steps into the role that the at-fault driver's insurance should have played.
It covers:
- Your medical bills and those of your passengers
- Lost wages if your injuries keep you from working
- Pain and suffering damages in more serious cases
Illinois requires two types of uninsured motorist coverage on every personal auto policy.
Uninsured motorist bodily injury (UMBI). This covers injuries to you and your passengers when an uninsured driver causes an accident. The required minimum is $25,000 per person and $50,000 per accident.
Uninsured motorist property damage (UMPD). This covers damage to your vehicle when an uninsured driver hits it. The required minimum is $15,000.
You'll see it written as 25/50 for bodily injury plus $15,000 for property damage. Illinois law also requires your carrier to offer you UM limits that match your liability limits. So if you buy 100/300 liability coverage, the carrier has to offer you 100/300 UM. You can decline the higher UM limits in writing, but most drivers in the Chicago suburbs shouldn't.
Why Illinois requires it
The state requires UM coverage because the alternative leaves too many injured people with no real recourse.
If a driver with no insurance rear-ends you on I-88 and totals your car, you can sue them. But suing someone who carries no insurance often means pursuing someone who has nothing to collect. A court judgment against an uninsured driver looks good on paper and pays nothing in practice.
UM coverage closes that gap. It lets you recover against your own policy when the person responsible for your accident can't pay. The premium you're paying for UM coverage is essentially buying protection against the roughly 12 percent of Illinois drivers who never paid for coverage themselves.
What underinsured motorist coverage is (and why you need both)
Illinois doesn't require underinsured motorist (UIM) coverage. Carriers have to offer it when you buy UM coverage, and you can decline it in writing. Most people shouldn't.
UIM coverage pays when you're hit by a driver who has insurance, but not enough to cover your damages.
Say a driver carrying the Illinois minimums (25/50/20) causes an accident that sends you to the hospital. Their $25,000 per-person limit pays first. If your medical bills come to $80,000, you're left with $55,000 uncovered after their policy is exhausted. Your underinsured motorist coverage pays the gap up to your UIM limit.
About a third of Illinois drivers carry only the state minimum liability limits. The combination of UM and UIM together covers a much wider slice of the realistic accidents you might actually face. When your carrier asks whether you want UIM coverage, say yes.
The required minimums aren't enough
The 25/50 minimums for UM bodily injury look like real coverage. They aren't, not for a serious accident.
Those limits were set in 1989. Medical costs have gone up considerably since then.
An ambulance ride in the Chicago area runs $1,000 to $2,500 depending on distance and care level. An ER visit after a moderate collision, including imaging and treatment, can hit $10,000 to $20,000. Add surgery, a few days in the hospital, and physical therapy, and a single seriously injured person can have $60,000 to $100,000 in documented medical bills.
If you're hit by an uninsured driver and your UM coverage is at the $25,000 minimum, that's all you're collecting on a serious injury. The gap is yours to absorb.
That's why most insurance professionals recommend carrying UM and UIM limits that match your liability limits. If you've bought 100/300 liability because you want to protect your own assets in an at-fault accident, the same logic applies to protecting yourself when the accident isn't your fault. Bump your UM/UIM to 100/300 as well.
The cost difference isn't dramatic. Moving from the required 25/50 UM limits to 100/300 typically adds $75 to $150 per year to your premium. Given that it's the coverage that pays when you're the one in the hospital, that's a trade most suburban Illinois drivers should make.
Hit and run accidents
UM coverage in Illinois also applies to hit and run accidents, where the at-fault driver is unknown. If someone rear-ends you in a Naperville parking lot and drives off before you can get a plate number, that's handled as an uninsured motorist claim.
There are conditions. Most policies require physical contact between vehicles, so a phantom car that causes you to swerve and crash without touching you may not qualify under some policy language. And hit-and-run claims typically require a police report filed promptly.
Document everything immediately. Take photos of your vehicle, file the police report the same day, and notify your carrier as soon as possible. The more documentation you have upfront, the smoother the claim process goes.
What UM property damage covers (and its limits)
The $15,000 UM property damage requirement covers your vehicle when an uninsured driver is at fault. That's the straightforward use.
But here's what most drivers don't realize: if you're carrying collision coverage, it might make more sense to file a collision claim first and let your carrier pursue the uninsured driver afterward. Collision coverage has a deductible, typically $500 to $1,000, but it usually processes faster. If your insurer recovers from the uninsured driver, you may eventually get your deductible refunded.
For drivers who skip collision coverage on older vehicles, the $15,000 UM property damage limit might be the only way to cover vehicle damage from an uninsured driver. In that case, the limit needs to match your car's value. A $14,000 vehicle barely clears the required minimum. A $25,000 vehicle doesn't.
If your car's worth more than $15,000 and you don't carry collision, consider asking your carrier what it costs to raise your UM property damage limit. The premium difference is usually modest.
How uninsured drivers affect DuPage County and suburban commuters
The 12 percent statewide uninsured rate isn't evenly distributed across Illinois. Certain areas have significantly higher concentrations of uninsured drivers, and that risk follows the road, not the county line.
DuPage County residents who commute into Chicago or drive frequently in Cook County are regularly sharing lanes with drivers from higher uninsured-rate ZIP codes. You don't leave that exposure behind when you cross into the suburbs.
And within DuPage County itself, the risk is real. Twelve percent is the statewide average. If you're driving through Naperville, Wheaton, or Downers Grove on a typical weekday, roughly one in eight drivers around you has no liability coverage. On I-355, I-88, and Route 59 during rush hour, that math adds up fast.
UM coverage isn't theoretical protection for most suburban drivers. It's coverage many people will actually use at some point over a long enough driving career.
What happens when you don't have enough coverage
This scenario plays out across Illinois every day.
An uninsured driver runs a red light and hits your car at a busy Naperville intersection. You sustain a broken arm and a concussion. Your passenger has a broken collarbone. Total medical bills come to $45,000 between both of you.
If you're carrying UM at the state minimum (25/50), your insurer pays $25,000 per person maximum. Your $30,000 in personal medical bills gets capped at $25,000. Your passenger's $15,000 in bills is covered. You're left with $5,000 in unreimbursed costs from an accident that wasn't your fault.
If you're carrying 100/300 UM limits, both of your medical bills are covered in full. Nothing comes out of pocket on the medical side.
Your vehicle damage is a separate matter. If your car's worth $22,000 and you carry $15,000 in UM property damage without any collision coverage, you're $7,000 short on vehicle replacement.
None of this is the insurance company doing anything wrong. They paid exactly what your policy said they'd pay. The shortfall is a coverage decision made when the policy was written, often years before the accident happened.
Stacking UM coverage in Illinois
Some states allow UM coverage stacking, which lets you combine limits across multiple vehicles on the same policy. If you have two cars each with $100,000 UM coverage, stacking would give you $200,000 of UM protection per accident.
Illinois permits stacking in some circumstances but not all. Whether you can stack depends on your specific policy language. Many Illinois policies include anti-stacking clauses that cap you at the single highest per-vehicle limit even on multi-car policies. Worth asking your agent about directly if you have more than one vehicle and want to understand your actual UM exposure.
What it costs to upgrade your UM coverage
The numbers are smaller than most people expect.
For a driver in the Chicago suburbs with a clean record, moving UM and UIM coverage from the required 25/50 minimums to 100/300 typically costs $100 to $200 more per year on the full policy. Some carriers offer it for even less when it's packaged with a liability increase.
Adding UIM coverage if you currently don't have it runs $50 to $125 per year in most suburban markets, depending on the limits you choose.
Raising UM property damage from the $15,000 required minimum to $25,000 or $50,000 is usually $30 to $60 per year. If your car's worth more than the required coverage minimum, that's one of the cheapest coverage gaps to close.
Compare those numbers to what you're carrying in liability. Most suburban homeowners in Naperville or the collar counties carry 100/300 or higher on liability because they have assets worth protecting. The same logic applies to UM/UIM. The money flows both ways in an accident. Make sure both directions are covered.
Reviewing your UM coverage now
Most drivers set up an auto policy once and don't look at it again until renewal. A policy that made sense when you bought it might not be adequate today.
A few things worth checking on your current declarations page:
- **Do your UM/UIM limits match your liability limits?** They don't have to, but the logic for higher liability usually applies equally to UM/UIM protection.
- **Do you have underinsured motorist coverage at all?** It's not required in Illinois, and it's easy to have declined it years ago and forgotten. Look specifically for "UIM" or "underinsured" on your declarations page.
- **Is your UM property damage limit adequate for what your vehicle's worth?** The $15,000 required minimum falls short for most suburban households today.
- **Have your liability limits changed without a matching UM update?** If you bumped liability to 100/300 but didn't think to ask about UM, you may be carrying mismatched limits.
The premium difference between minimum UM coverage and meaningful protection is usually $100 to $200 per year. That's real money. But so is getting hit by one of the 12 percent of Illinois drivers who never paid for coverage themselves and then finding out your policy wasn't built for that moment.