Uninsured and Underinsured Motorist Coverage: What It Is and Why It Matters

Every time you pull out of your driveway, you’re sharing the road with drivers you know nothing about. Their driving record. Their financial situation. Whether they bothered to buy car insurance at all.

That last one matters more than most people realize.

According to the Insurance Information Institute, roughly 13% of drivers nationwide are uninsured. In some states, that number climbs to 20%. Do the math the next time you’re sitting at a busy intersection.

Uninsured and underinsured motorist coverage exists precisely for this scenario — and understanding it could be the difference between a bad day and a financial catastrophe.

What Uninsured and Underinsured Motorist Coverage Actually Does

Most people think of auto insurance as protection for what you might do to someone else. Uninsured and underinsured motorist coverage flips that around. It protects you when the driver who caused the accident can’t.

There are four components to know:

When the at-fault driver has no insurance:

• Uninsured Motorist Bodily Injury (UMBI) pays medical bills for you and your passengers
• Uninsured Motorist Property Damage (UMPD) pays to repair or replace your vehicle

When the at-fault driver has insurance, but not enough:

• Underinsured Motorist Bodily Injury (UIMBI) covers the gap in medical expenses for you and your passengers
• Underinsured Motorist Property Damage (UIMPD) covers the gap in vehicle damage

Whether these coverages are sold together or separately depends on your state. In Arizona, for example, they’re packaged together. Either way, most states require them — and with good reason.

The Uninsured Motorist Gap That Catches People Off Guard

Here’s a scenario worth thinking through. You’re rear-ended at a stoplight. The other driver is at fault. You get out, exchange information, and then discover they don’t have insurance.

You can still file a claim — but without uninsured motorist coverage, you’re on the hook for your collision deductible, any medical expenses beyond your personal injury protection limits, and lost wages if your injuries keep you out of work. Your only other option is to pursue the uninsured driver directly. That’s a slow, uncertain, and often fruitless process.

Hit-and-run accidents follow similar logic. Many insurers allow you to file a claim against your uninsured motorist coverage when a driver flees the scene, though some will require evidence that the driver was in fact uninsured. In nearly every case, a police report is required — so file one immediately.

“I Have Health Insurance. Do I Still Need This?”

It’s a reasonable question, but the answer is almost always yes — and here’s why.

Medicare and Medicaid typically won’t pay out until other applicable insurance has been exhausted. If you have private health insurance, review how it handles injuries from an auto accident, specifically, because many plans treat it differently than standard medical care.

Beyond that, health insurance has limitations that uninsured motorist coverage doesn’t share. UMBI and UIMBI generally carry no deductible. Health insurance usually does. Health insurance doesn’t cover lost wages. Uninsured motorist coverage often does. And perhaps most importantly — your health insurance covers you, not your passengers. If someone in your car doesn’t have their own coverage, your uninsured motorist protection is the only thing standing between them and out-of-pocket expenses caused by someone else’s negligence.

Choosing the Right Uninsured Motorist Coverage Limits

The standard guidance on limits is straightforward: match your uninsured motorist bodily injury limits to your liability limits. The logic is simple — you’re electing to protect yourself at the same level you’re protecting others.

For example, if you’ve selected bodily injury liability of $100,000 per person / $300,000 per accident, carry the same limits for uninsured motorist protection. That way, each injured occupant in your vehicle can collect up to $100,000, with the per-accident limit providing a backstop for multiple claimants.

For property damage, the math is even simpler. Select a limit that reflects what your car is actually worth. If your vehicle is valued at $40,000 and you’re not carrying collision coverage, that’s the number to work from. Don’t underinsure the asset you depend on every day.

The bottom line

The road is unpredictable. The drivers on it are too. Uninsured and underinsured motorist coverage won’t change either of those things — but it will make sure that someone else’s bad decision doesn’t become your financial problem.