Call For A Free Consultation(602) 345-1818
Call For A Free Consultation(602) 345-1818
The Insurance Research Council’s 2021 report estimated that roughly 1 in 8 Arizona drivers were uninsured. If one of them hits you, your own auto policy is the only thing standing between you and a stack of medical bills. That’s what Arizona uninsured motorist coverage is for. This article walks through how UM coverage works under A.R.S. § 20-259.01, when UM applies versus UIM, what your own insurance company is allowed to do once you file a claim, and where most claimants get tripped up.
A quick note before we start: the moment a UM claim gets filed, your own insurer becomes the other side. They are no longer the friendly company that sends out renewal notices. They are the party writing the check, and the adjuster’s job is to write the smallest check the policy allows. That changes everything about how the claim gets handled.
Uninsured motorist coverage (UM) is first-party insurance bought from your own carrier that pays bodily injury damages when an at-fault driver either has no insurance, can’t be identified, or doesn’t have enough insurance to cover what they owe. In Arizona, UM and underinsured motorist (UIM) coverage are governed by A.R.S. § 20-259.01.
The basic mechanics:
In practice, UM claims look a lot like third-party claims. The adjuster wants medical records, wants a recorded statement, wants property damage estimates, and eventually wants to settle for as little as possible. If you want a full primer on how Arizona auto insurance claims work generally, that’s a separate read; this article focuses specifically on UM mechanics.
People (and unfortunately, some attorneys) use UM and UIM interchangeably. They are not the same.
Uninsured motorist (UM) coverage applies when the at-fault driver has no liability insurance at all, or when the at-fault driver cannot be identified (the classic hit-and-run scenario).
Underinsured motorist (UIM) coverage applies when the at-fault driver has liability insurance, but the policy limits are too low to cover your damages. Example: the other driver carries Arizona’s bare-minimum liability policy ($25,000 per person), and the medical bills alone are $80,000. You collect the $25K from their carrier, and then you turn to your own UIM coverage to make up the gap.
Which one applies determines who you sue, what notice you owe, and how quickly the clock starts running. Under A.R.S. § 20-259.01, both coverages must be offered by every Arizona insurer that sells liability coverage, but they are distinct products with distinct triggers.
Arizona’s minimum liability requirement under A.R.S. § 28-4009 is 25/50/15: $25,000 in bodily injury per person, $50,000 per accident total, and $15,000 in property damage. That is the floor. A large share of Arizona drivers carry exactly the minimum.
Here is what 25/50/15 buys in the real world: a single ER visit, a CT scan, and a couple of follow-ups will eat $25,000 fast. Surgery? Gone in a day. A herniated disc that needs injections and physical therapy? You’re looking at $40K to $80K in conservative care alone, before any wage loss.
This is why UM and UIM coverage matter even when the other driver has insurance. Their minimum policy was never designed to make a real injury victim whole. UIM is the gap-filler.
Three scenarios trigger UM coverage in Arizona:
1. The at-fault driver has no insurance. They were driving without coverage, the policy lapsed, or the policy was canceled for non-payment.
2. The at-fault driver’s policy is insufficient (UIM). Their carrier pays the limit, and the damages exceed it. UIM picks up the rest, capped at the UIM limit.
3. Hit-and-run. Under A.R.S. § 20-259.01(M), UM coverage applies when the at-fault driver flees the scene and cannot be identified. This is where UM saves people most often, especially in metro Phoenix where freeway sideswipes and parking-lot hits happen daily.
After a hit-and-run, the practical playbook (call 911, document the scene, get witness contact info, file a police report immediately) matters enormously because the UM carrier will want proof the other driver actually existed and actually caused the crash. A “phantom vehicle” claim without a police report is the easiest claim in the world for an adjuster to deny.
UM is bodily injury coverage. In Arizona it doesn’t pay for vehicle repairs, that’s collision coverage. Some policies include UMPD (uninsured motorist property damage) as an add-on, but it’s separate from standard UM. Check the declarations page.
Under A.R.S. § 20-259.01, every Arizona insurer that writes a liability policy is required to offer UM and UIM coverage in amounts equal to the liability limits the customer selected. The insurer has to make this offer, in writing, before the policy is bound.
Here is the part that surprises people: UM coverage can be rejected, but the rejection has to be in writing, and the insurer has to be able to produce that signed rejection later. If they can’t, the law generally treats the policy as if it included UM at the same limits as the liability coverage by default.
Our team has seen this come up in claims where the insured “remembers” being offered UM coverage and turning it down on the phone, but the carrier has no signed rejection form in the file. In those situations, the coverage may exist by operation of law, even though the insured was paying premiums as if it didn’t. If a carrier says “you don’t have UM,” ask them to produce the signed rejection. If they can’t, the coverage argument is alive.
Minimum UM amount: Same as the liability minimums under A.R.S. § 20-259.01(A). So a 25/50 liability policy must come with a UM offer of at least 25/50.
This is the rule almost every Phoenix PI website skips, and it surprises a lot of claimants with more than one vehicle.
Under A.R.S. § 20-259.01(H), Arizona prohibits stacking of UM and UIM coverage across policies. “Stacking” means combining the UM limits from multiple vehicles or multiple policies to create a larger pool. In some states, if you have three vehicles each insured for $50,000 in UM, you can stack them and pursue a combined limit. Not in Arizona.
What that means in practice:
This is one of the more expensive surprises in Arizona insurance law. If you’re shopping coverage, the lesson is: buy higher single limits on the vehicle you actually drive most, not modest limits across multiple vehicles thinking they’ll stack.
The process looks like this:
When the offer comes in, evaluate it carefully. Lowball offers on UM claims are the rule, not the exception, because the adjuster knows most claimants don’t understand they’re negotiating with an adversary. For more on how to recognize a lowball offer, there’s a separate breakdown of the signals.
Arizona puts hard timelines on insurance carriers under the Unfair Claims Settlement Practices regulation, A.A.C. R20-6-801 (the administrative rule that implements A.R.S. § 20-461):
These aren’t suggestions. When a carrier blows through these deadlines without explanation, that’s evidence of unfair claims handling. If a UM claim has been sitting open for 90+ days with no decision and no real communication, that timeline matters legally.
This is the part that surprises people the most. When a UM claim gets filed, the insurance company has a legal duty to handle it with the same good faith they’d owe any insured. The Arizona Supreme Court spelled this out in Noble v. National American Life Insurance Co., 128 Ariz. 188, 624 P.2d 866 (1981), and refined it in Rawlings v. Apodaca, 151 Ariz. 149, 726 P.2d 565 (1986): insurers must investigate fairly, communicate honestly, and give the insured’s interests at least equal consideration to their own. When they don’t, that’s bad faith insurance claim in Arizona territory.
What bad faith on a UM claim typically looks like:
The damages available for first-party bad faith in Arizona are significant. Under Rawlings, an insured can pursue the contract damages (what the policy should have paid), plus consequential damages (financial harm caused by the mishandling), plus punitive damages in cases where the conduct was sufficiently egregious. That last category is what makes bad faith claims meaningful, because it gives carriers a real financial reason not to mishandle UM claims.
Here’s the trap. Auto policies have a cooperation clause, which requires the insured to cooperate with the insurer’s investigation. When a UM claim gets filed, the adjuster will almost always request a recorded statement, and they will lean on the cooperation clause to get it.
Cooperation is required. Walking into a recorded statement unprepared is not.
The recorded statement on a UM claim is structurally the same as a recorded statement to the other driver’s adjuster: every word can be used to attack damages later. The adjuster will ask leading questions designed to lock in admissions about pre-existing conditions, gaps in treatment, prior accidents, and the severity of symptoms in the first few days. These are the same adjuster tactics that get used in third-party claims, just wearing your team’s jersey.
What to do:
Cooperation does not mean “answer trick questions on the spot under stress.” It means provide the information the policy requires, in a reasonable manner.
Two clocks run on a UM claim. Pay attention to both.
1. The personal injury statute of limitations. Under A.R.S. § 12-542, an injured person has two years from the date of the accident to file a personal injury lawsuit against the at-fault driver in Arizona. Arizona’s two-year statute of limitations applies to the underlying tort claim and matters because UIM claims often require the claimant to preserve the right to sue the underinsured driver (or at least exhaust their limits) before going after UIM coverage.
2. The contractual claim against your own carrier. UM/UIM claims are technically contract claims against the insurer, and policies often contain their own time-limit provisions. These can be shorter or longer than the tort statute, and they vary by carrier. Read the policy. Arizona courts have generally enforced reasonable contractual limitations periods in UM policies.
The practical rule: don’t assume two years gives you two years. File the claim early, document everything, and don’t sit on it.
When the UM offer comes, don’t sign in the moment. UM releases are typically broad, often covering not just the UM claim but other claims under the policy. Once signed, it’s done. Before accepting a settlement offer on a UM claim, get a clear picture of future medical needs, wage loss, and non-economic damages. A first offer that looks generous in month two often looks like a fraction of the claim’s true value in month nine when surgery enters the picture.
Often yes, unless a written rejection was signed. Under A.R.S. § 20-259.01, the insurer was required to offer UM/UIM coverage, and the rejection had to be in writing. If the carrier can’t produce a signed rejection, coverage generally applies by operation of law at limits equal to the liability coverage.
Yes. Identification doesn’t matter for UM purposes; what matters is whether the at-fault driver had liability coverage. Identified and uninsured triggers UM. Identified and underinsured triggers UIM after exhausting the at-fault driver’s limits.
Yes, in most standard Arizona policies. Permissive passengers in a covered vehicle are typically considered “insureds” for UM purposes. The exact definition varies by policy.
Arizona law generally prohibits insurers from raising premiums based on a UM claim where the insured was not at fault. That said, overall claims history can affect underwriting. Filing a legitimate UM claim is what the coverage exists for.
MedPay is no-fault medical payments coverage. It pays medical bills regardless of who caused the accident, up to a low limit (usually $1K to $10K). UM is liability-based, requires the other driver to be at fault, and covers all categories of bodily injury damages including pain and suffering. They can apply together within the same policy in Arizona.
Not legally. But once the insurer becomes the adversary, the dynamic is identical to litigating against any other carrier. If the injuries are significant, or if the adjuster is delaying, lowballing, or asking for a recorded statement, talking to an attorney before responding is worth a phone call.
After being hit by an uninsured or underinsured driver in Arizona, or by a hit-and-run driver who fled the scene, the next move matters. Recorded statements, signed releases, and missed deadlines are mostly irreversible.
Talk to us before talking to your insurance: (602) 345-1818. Free case review. We’ll explain how UM coverage stacks up against the actual damages, and what a carrier is allowed (and not allowed) to do next.
By Jared J. Pehrson | Impact Legal Car Accident Attorneys
We're Here To Help 24/7
(602) 345-1818