Uninsured motorist coverage in Arizona: What happens if the other driver has no insurance?

The crash on I-10 left you with a broken wrist and an emergency room bill. The other driver admitted fault at the scene. A week later comes the catch: he has no insurance at all, and there’s nothing to collect.

In Arizona, that’s hardly unusual. The Insurance Research Council puts the state’s uninsured rate at 10.6%, and across the country, one in three drivers is either uninsured or underinsured. Set against 122,247 crashes in Arizona that same year, the odds of running into one are very real. This is the exact situation uninsured motorist coverage in Arizona was built for.

Understanding uninsured motorist coverage in Arizona

Uninsured motorist coverage (UM) is part of your own auto policy. It kicks in when the at-fault driver has no insurance at all, so the bill goes to your insurer instead of his. It pays for the same things his coverage would have: medical care, lost wages, and pain and suffering, the part of the loss insurers are slowest to put a number on.

UM also covers hit-and-run. If the driver took off and was never identified, your policy still responds, though Arizona requires proof that the phantom vehicle actually caused the crash (ARS § 20-259.01, subsection M). The logic is simple. You pay premiums for years for exactly this moment, when someone else is to blame and there’s no one to bill.

How does underinsured motorist coverage work

More often, the trap isn’t a total lack of insurance. It’s not enough of it. The other driver has a policy, but only the bare minimum.

Arizona’s minimum liability limits have been 25/50/15 since July 1, 2020: $25,000 for injuries to one person, $50,000 for everyone hurt in a single crash, and $15,000 for property damage (ARS § 28-4009). It sounds like protection, but after a serious injury the number is almost symbolic. Three days in the ICU at Banner University Medical Center in Phoenix can easily run $30,000, and surgery or a brain injury pushes the tab past six figures. Motorcyclists get the worst of it: 258 riders died in Arizona in 2023, and the survivors’ bills run far past the at-fault driver’s minimum limit.

So how does underinsured motorist coverage work? That gap is exactly what underinsured motorist coverage in Arizona is for. UIM pays the difference between what the at-fault driver’s minimum policy covers and what your injuries are actually worth, up to your own UIM limit. Insurers like to skip one detail quietly: stacking. If your policy covers more than one car, the Arizona Supreme Court confirmed in Franklin v. CSAA that you can stack the UIM limits across each vehicle unless the contract clearly bars it.

When a motorcyclist gets hurt this way, a sharp motorcycle injury attorney in Phoenix checks the rider’s own UM/UIM limits first. Those limits often become the main source of any recovery.

Is uninsured motorist coverage required in Arizona

No. Arizona doesn’t make drivers buy UM or UIM. What the law requires is that your insurer offer it to you in writing. That’s the Arizona uninsured motorist statute, ARS § 20-259.01.

You can turn it down, but only in writing. The decision shows up on your policy’s declarations page. If there’s no UM/UIM line there, you’ve waived it, and you can’t add it back later. By law, the amount can’t fall below the liability limits on your own policy. So it’s smarter to pull out the contract and check those lines now, not on the day you need them.

Steps to take after a crash with an uninsured or hit-and-run driver

The first few hours shape how strong your eventual UM/UIM claim will be. A few things worth doing:

• Call the police and get an official report. After a hit-and-run it’s the foundation of the case, without it, the insurer will question whether the crash even happened.
• Tell your own insurer about the wreck, but don’t give a recorded statement or agree to quick numbers until you’ve talked to a lawyer.
• Photograph everything: the vehicles, the damage, the lane markings and the road signs
• See a doctor even if you think you walked away clean. Some injuries don’t surface until the second day.
• Get contact details from any witnesses before they scatter.

Deadlines are their own story. A claim against your own insurer under UM/UIM runs on a special timetable (ARS § 12-555), not the general two-year rule for suits against the at-fault driver. The process moves in stages, and one missed date can cost you the right to collect.

Why you need an Arizona car accident attorney for a UM/UIM claim

The strange part: the company cutting your check is your own, the one you trusted for years, and it treats you like an opponent. Because the money leaves its pocket, it has just as much reason to lowball you as any stranger’s insurer.

That’s not a guess. It’s the position of the Arizona Supreme Court. In Zilisch v. State Farm (2000), the carrier valued a UIM claim first at zero, then at a few tens of thousands, brushing past the medical findings in front of it. An arbitration panel awarded the injured woman $387,500, and a separate bad-faith suit added another $460,000 in compensatory damages and $540,000 in punitives. The court put it bluntly: an insurer can’t shave a payout and stall, hoping the claimant gives up and settles for less.

A lawyer levels that game. They gather the evidence, check the policy for stacking, hold the line on the ARS § 12-555 deadlines, and force the insurer to do honest math. They also blunt the carrier’s favorite move, shifting part of the blame onto you to trim what it owes. For a motorcyclist that often turns into a fight over the helmet, and how Arizona’s helmet law actually bears on your share of fault can swing the final number more than any other argument.

Kermani LLP works across Arizona on a contingency fee: you pay nothing until we recover for you. For one client hurt by an uninsured driver, the firm secured $910,000. If the driver who hit you had no insurance or only the bare minimum, call us. We’ll go through your policy and show you what to realistically expect.