I get some version of this question almost every week from drivers in Boise who have just been hit by someone with too little coverage. They pull out their declarations page, see “uninsured motorist coverage,” and wonder whether that same policy line applies when the other driver had some insurance — just not enough. It is a fair question, and the answer matters a great deal when your bills are climbing past the at-fault driver’s policy limits.
At Kluksdal Law | Boise Personal Injury Attorney, I handle these claims regularly throughout Idaho, and I want to give you a straight answer on how this works under Idaho law in 2026.
Can Uninsured Motorist Coverage Also Cover Underinsured Accident Claims in Boise?
Yes — but only if your policy includes underinsured motorist (UIM) coverage as a separate or combined component. In Idaho, these are treated as related but legally distinct coverages.
Under Idaho Code 41-2502, every motor vehicle liability insurer doing business in Idaho must offer both uninsured motorist (UM) and underinsured motorist (UIM) coverage. The named insured has the right to reject either or both in writing or in an electronic record. If you did not reject UIM coverage, it should be part of your policy. If you did reject it — even years ago — that rejection carries forward into renewals with the same insurer or an affiliate, and you are not automatically re-offered the coverage each renewal.
So the practical answer for most Boise drivers is: check your declarations page. UM and UIM coverage are sometimes written together as a single line item. Sometimes they appear separately. Sometimes only one was purchased. The difference between a UM claim and a UIM claim is not just semantic — it determines which factual trigger applies, and how your insurer will process the claim.
A UM claim applies when the other driver had no liability insurance at all, or when they fled the scene and cannot be identified. A UIM claim applies when the at-fault driver had insurance, but their policy limits are not enough to cover your losses. These are different situations, governed by different parts of your policy, even if both coverages appear on the same declarations page.
Why People Confuse These Two Coverages?
Most drivers buy UM and UIM together because insurers typically offer them that way, often at the same limit. Because they sit side by side on the declarations page and share similar initials, people assume they function identically. They do not.
In my experience, the confusion becomes costly when a client receives a settlement offer from the at-fault driver’s insurer, accepts it without consulting an attorney, and then tries to bring a UIM claim. Depending on the policy language, accepting that payment without your own insurer’s consent can jeopardize your UIM claim entirely. Most policies include a consent-to-settle or consent-to-release provision. Ignoring it is one of the more common and preventable mistakes I see.
The Policy Language Controls More Than You Might Expect
Idaho Code 41-2502 sets the framework — the offer requirement, the rejection right, the minimum reference limits. But once coverage exists, the actual mechanics of a UIM claim depend heavily on what your specific policy says. Whether your insurer calculates UIM benefits on an excess basis, how notice must be given, and what documentation you need to provide — these vary by policy.
I always tell clients: do not assume your claim works the way a friend’s claim did. Have the policy reviewed by someone who reads these things regularly. The American Bar Association has noted that insurance policy interpretation is one of the most frequently litigated areas of contract law for exactly this reason — the language is specific, and small differences change outcomes.
Two Claims, Two Different Clocks
This is where I see people lose rights they did not know they had. A tort claim against the at-fault driver and a UM or UIM contract claim against your own insurer run on different timelines.
The deadline to file a personal injury lawsuit against the at-fault driver is generally two years under Idaho Code 5-219(4), and in Idaho the clock generally starts at the time of the occurrence, not when you discover the full extent of your injuries. That two-year period is not the deadline for your UM or UIM claim against your own insurer. That claim is a contract claim, and your policy will have its own notice requirements, cooperation obligations, and suit limitation provisions. These vary. Some policies give you less time than you might expect.
For legal context on how insurance contract deadlines interact with tort deadlines, Cornell Law School’s Legal Information Institute provides a solid primer on the distinction between first-party and third-party insurance claims.
If you have been injured and you are trying to figure out which clock is running, the safest thing you can do is speak with an attorney promptly. Deadlines and legal standards depend entirely on the specific facts of your situation.
What Injuries Look Like in These Cases?
Many of the clients I see after crashes with uninsured or underinsured drivers have injuries that are more serious than the at-fault driver’s policy can cover. Soft tissue injuries that require months of physical therapy, traumatic brain injuries from the impact, or orthopedic injuries that require surgery — these are the cases where the gap between the at-fault driver’s coverage and your actual damages is most pronounced.
The National Institutes of Health has documented that traumatic brain injuries, even mild ones, can produce symptoms and costs that extend well beyond the acute phase. If you are dealing with a serious injury, your medical expenses alone may exceed what a minimum-limits driver can pay. That is precisely the situation UIM coverage is designed to address.
What I Recommend if You Are in This Situation?
First, do not settle with the at-fault driver’s insurer without understanding how that settlement affects your UIM claim. Second, locate your declarations page and find out what UM and UIM limits you carry. Third, give your insurer timely notice that you may have a UIM claim — most policies require this even before you know the full extent of your damages.
FindLaw describes UIM claims as “first-party” claims, meaning you are dealing with your own insurer rather than an adverse party. That does not make the process simple. Insurers have their own interests, and they evaluate these claims closely.
If a wrongful death resulted from the crash, the stakes are even higher, and the process for a wrongful death claim under Idaho law involves additional considerations worth discussing with an attorney directly.
You can read what our Boise clients say about how we have handled these situations, and you can learn more about our practice to understand the background I bring to these cases.
If you were injured in a crash in Idaho and the other driver’s insurance is not enough to cover your losses, contact us to talk through your options. I am happy to review your policy and your situation with no pressure.
Kluksdal Law | Boise Personal Injury Attorney
350 N 9th St Ste 500, Boise, ID 83702
(208) 996-8180
Written by John Kluksdal. Read more about the author.
