Idaho Uninsured Motorist Insurance

What Is Idaho Uninsured Motorist Insurance?

Idaho uninsured motorist insurance is a mandatory component of every auto insurance policy sold in Idaho. It covers your medical expenses, lost income, and certain other damages when an at-fault driver has no liability insurance or flees the scene (hit-and-run).

Idaho Code § 41-2502 mandates that insurers offer UM coverage equal to your liability limits, but you can reject it in writing. If you accept the coverage, which most drivers do, the minimum required limits are:

You can purchase UM coverage with limits higher than the state minimum. Higher limits provide more protection if your medical bills exceed $25,000 after a serious accident.

Hit-and-run coverage. UM coverage in Idaho applies to accidents where the other driver cannot be identified, provided the accident is reported to law enforcement within 72 hours and you are physically struck by the vehicle. Property damage from a hit-and-run may also be covered if you carry UM property damage (UMPD), which is optional in Idaho.

Stacking rules. Idaho does not allow stacking of UM limits across multiple vehicles on the same policy. If you have two cars each with $25,000/$50,000 UM coverage, you can only recover up to the per-vehicle limit, not combine them. Per Idaho Attorney General opinions, stacking is prohibited unless your policy explicitly states otherwise, and most standard Idaho policies do not.

If you own multiple vehicles, read the policy language carefully. Some insurers offer a "no stacking" endorsement that limits recovery to the highest single-vehicle limit. Others may allow stacking through an added endorsement if the vehicle is garaged in a different state.

Filing a UM claim in Idaho follows a specific process. Understanding the steps helps you avoid delays or outright denials.

1. Report the accident. Call local law enforcement immediately. If the other driver is uninsured or flees, request a police report. Idaho requires that a hit-and-run be reported within 72 hours for UM coverage to apply.
2. File a claim with your own insurer. Contact your insurance company and provide the police report, your medical records, and wage loss documentation. You will be dealing with your own insurer's claims department.
3. Your insurer investigates. The insurance company will confirm the at-fault driver was uninsured (or that a hit-and-run occurred). They may request additional documentation.
4. Your insurer pays your losses up to your UM limit. After the investigation, your insurer will pay your medical bills and lost wages, up to your chosen per-person and per-accident limits. Payments typically take 30–60 days.
5. If you have underinsured motorist (UIM) coverage, use it. If the at-fault driver has insurance but insufficient limits (e.g., $25,000 policy but your medical bills are $100,000), your UIM coverage kicks in to cover the difference, up to your UIM limit.

Arbitration vs. lawsuit. Most Idaho UM policies include an arbitration clause. If you and your insurer disagree on the value of your injuries, you can demand binding arbitration rather than filing a lawsuit. Arbitration is generally faster and less expensive than court.

Statute of limitations. You must file a UM lawsuit in Idaho within 2 years of the accident date. If you miss this deadline, you lose the right to sue your own insurer for UM benefits.

Subrogation. After paying your claim, your insurer may pursue the uninsured driver for reimbursement (subrogation). You cannot interfere with this process.

Idaho law distinguishes between uninsured motorist (UM) and underinsured motorist (UIM) coverage, though many insurers sell them together as a single UM/UIM endorsement.

Should you buy UIM coverage? If you have assets to protect or if you regularly carry passengers, UIM is worth considering. A driver with low liability limits ($25,000 per person) may not be judgment-proof, but in Idaho, many drivers carry only the state minimum. UIM ensures you are not left paying out-of-pocket when the at-fault driver's insurance runs out.

Pricing difference. UM and UIM are usually priced together. Adding UIM typically increases your UM premium by 20–40%, depending on your insurer and the limits chosen. The additional cost is modest relative to the protection it provides.

For more on how UM/UIM interacts with personal injury protection (PIP) in other states, see our guide on whether you need .

Common Limitations

• UM coverage only applies to bodily injury, not property damage, unless you buy separate UMPD.
• Idaho does not allow stacking, so insuring multiple cars does not increase your per-accident limit.
• Arbitration clauses are common, read your policy's dispute resolution section before assuming you can sue.

Mistakes to Avoid

• Declining UM coverage to save a few dollars a month. With nearly 10% of Idaho drivers uninsured, this gamble can leave you with massive medical bills.
• Assuming your health insurance covers accident injuries, it may have high deductibles or exclude auto accident treatment.
• Failing to report a hit-and-run within 72 hours. Miss this window and your UM claim may be denied regardless of the circumstances.
• Rejecting UIM coverage when you have assets or a long commute on Idaho's highways.
• Not reviewing your policy limits annually. State minimums haven't changed in years, but medical costs have risen significantly.

Pros and Cons

👍 Pros

• Mandatory, you are automatically protected unless you opt out in writing.
• Covers hit-and-runs, which are common on rural Idaho roads.
• Relatively low cost compared to liability coverage.
• Can include lost wages and pain & suffering.

👎 Cons

• Minimum limits may be insufficient for serious accidents with high medical bills.
• Stacking not allowed, limits are per vehicle, not cumulative.
• Arbitration may favor insurers in disputed claims.
• UIM coverage is optional and often overlooked.

Expert Tips

• Consider raising your UM limits to $100,000/$300,000 if you own a home or have significant savings.
• Always report a hit-and-run to police immediately, not the next morning.
• If you have health insurance, check whether your plan covers auto accident injuries before relying solely on UM.
• Review your UM/UIM limits whenever you add or remove a vehicle from your policy.

Bottom Line

Idaho's mandatory UM coverage is a reasonable baseline for protecting yourself from uninsured drivers. The $25,000/$50,000 minimum is adequate for minor accidents, but anyone with assets or a family should consider higher limits and UIM coverage. The modest additional premium is worth the long-term security. ✅ Strong choice for all Idaho drivers. ❌ Less adequate for drivers with high net worth or long highway commutes.