“I have full coverage, so I don’t need UM/UIM.”
You’re not alone if you’ve ever had this notion. It’s one of the most widespread—and possibly the riskiest—misconceptions regarding auto insurance. The truth? What many drivers refer to as “full coverage” usually consists of comprehensive, collision, and liability insurance. However, none of those pay for your medical expenses or lost income if you are struck by an underinsured or uninsured driver.
That’s where Uninsured Motorist (UM) and Underinsured Motorist (UIM) coverage come in. In 2026, with new legislation taking effect in several states and uninsured driver rates remaining high, understanding this coverage is more critical than ever.
What Is Uninsured and Underinsured Motorist Coverage?
Uninsured and underinsured motorist coverage (often abbreviated as UM/UIM) is a type of protection that covers you when you’re in an accident caused by a driver who either has no insurance or not enough insurance to cover your damages .
The Two Components
| Coverage Type | What It Does | When It Applies |
|---|---|---|
| Uninsured Motorist (UM) | Covers your medical bills, lost wages, and sometimes property damage when the at-fault driver has no insurance | Driver has zero insurance coverage |
| Underinsured Motorist (UIM) | Covers the gap when the at-fault driver’s insurance limits are too low to cover your full damages | Driver has insurance, but their limits are insufficient |
Here’s a practical example: Suppose you’re in an accident and incur $50,000 in medical bills. The at-fault driver has only $25,000 in liability coverage—the legal minimum in many states. Without UIM coverage, you’d be responsible for the remaining $25,000 yourself. With UIM coverage, your insurance steps in to cover the difference .
Does It Cover Property Damage?
UM/UIM coverage typically focuses on bodily injury—medical bills, lost wages, and pain and suffering. Most policies do not cover property damage under standard UM/UIM . However, some states offer a separate coverage called Uninsured Motorist Property Damage (UMPD), which can help repair your vehicle if the at-fault driver is uninsured. This is often less expensive than carrying full collision coverage .
Hit-and-Run Protection
UM coverage also applies in hit-and-run cases. If the at-fault driver flees the scene and cannot be identified, your uninsured motorist coverage can step in to compensate you for your injuries and damages .
The 2026 Landscape: New Laws You Need to Know
Several states have enacted significant changes to auto insurance requirements in 2026. Understanding these updates is essential to ensuring you’re properly protected.
New Jersey: Higher Minimums Are Here
As of January 1, 2026, New Jersey raised its minimum auto insurance limits for both liability and UM/UIM coverage .
| Coverage Type | Old Minimum | New Minimum (2026) |
|---|---|---|
| Bodily Injury (per person) | $25,000 | $35,000 |
| Bodily Injury (per accident) | $50,000 | $70,000 |
| UM/UIM Coverage | $25,000/$50,000 | $35,000/$70,000 |
Property damage liability remains at $25,000. If you currently carry only the state minimum, your coverage will automatically increase at renewal, with a modest premium adjustment .
Mississippi: New UM/UIM Rules Taking Effect July 2026
Mississippi is implementing two significant changes effective July 1, 2026 :
- Mandatory UM/UIM Coverage: Insurers must now inform policyholders about the benefits of UM/UIM coverage on an approved form. Policyholders must sign if they wish to reject it .
- Default Matching Limits: Unless the insured specifically selects lower limits in writing, UM/UIM coverage limits must be identical to the policy’s bodily injury liability limits .
This means that if you carry $100,000/$300,000 in liability coverage, your UM/UIM coverage will default to the same amount unless you actively opt for less.
California: Rideshare Insurance Reform
California enacted SB 371 and AB 1340 in 2026, reforming rideshare insurance requirements. Key changes include :
- Minimum UM/UIM coverage for ride-hail trips: $60,000 per person / $300,000 per accident (down from previous $1M minimums, intended to reduce ride costs)
- Expanded UM/UIM coverage: Now applies more consistently while drivers are actively logged into the rideshare platform, not just during active rides
- Fewer coverage disputes: Injured passengers face fewer denials based on app status timing
If you use rideshare services frequently—or drive for Uber or Lyft—understanding these changes is essential.
Why This Coverage Matters: The Numbers Don’t Lie
The Uninsured Driver Problem
According to the Insurance Information Institute, approximately one in eight drivers on U.S. roads is uninsured. In states like Florida and Texas, that number rises to nearly one in four .
Even among insured drivers, many carry only the bare minimum required by law. In a serious accident, these minimum limits—often $25,000 or less—can be exhausted in the first few hours of emergency medical care .
The Financial Risk of Going Without UM/UIM
Consider this scenario: You’re involved in a serious accident caused by an uninsured driver. Your medical bills total $75,000. You’re unable to work for six months, losing $30,000 in income. Your vehicle is totaled, worth $25,000.
Without UM/UIM coverage, you’re responsible for:
- $75,000 in medical bills
- $30,000 in lost wages
- $25,000 to replace your vehicle
Total: $130,000 out of pocket. Even if you sue the at-fault driver, if they have no assets, you may never collect .
With UM/UIM coverage, your insurance company covers these costs—up to your policy limits—and handles the legal complexities of pursuing the at-fault driver .
Who Is Covered?
UM/UIM coverage typically extends beyond just the named driver. In most policies, any person in the insured’s household can make a claim, whether or not they were driving at the time .
Example: If your child is struck by an uninsured driver while crossing the street, your UM coverage can provide compensation for their injuries .
How UM/UIM Claims Work
The Claims Process
- Accident occurs with an uninsured or underinsured at-fault driver
- Report the accident to your insurance company, providing details and documentation
- Your insurance investigates and determines the other driver’s insurance status
- Your UM/UIM coverage pays for your medical bills, lost wages, and other covered damages—up to your policy limits
Important: You Must Prove the Other Driver Was Uninsured
To access UM coverage, you must establish that the at-fault driver had no insurance at the time of the accident. This is typically done by:
- Obtaining a police report indicating no insurance
- Contacting the other driver’s alleged insurer to confirm no active policy
Underinsured Claims: How Stacking Works
If the at-fault driver has insurance but insufficient limits, your UIM coverage pays the difference. For example :
- Your damages: $25,000
- At-fault driver’s limits: $15,000
- Your UIM coverage: $100,000
- You receive: $15,000 from at-fault driver + $10,000 from your UIM coverage
State-Specific Rules
States vary in how they handle UM/UIM claims. Massachusetts law, for example, includes specific provisions about:
- Coverage for hit-and-run vehicles
- Insolvency of the at-fault insurer
- “Stacking” limits from multiple vehicles or policies
Always check your state’s specific regulations.
Common Misconceptions Debunked
Myth 1: “Full coverage includes UM/UIM.”
False. “Full coverage” typically refers to liability + collision + comprehensive. UM/UIM is separate coverage that must be explicitly added to your policy .
Myth 2: “I’m a safe driver, so I’ll never need it.”
False. You can be the safest driver on the road, but you can’t control whether other drivers carry insurance. Accidents caused by uninsured drivers happen to careful drivers every day .
Myth 3: “It’s too expensive.”
False. UM/UIM coverage is remarkably affordable. For just a few extra dollars a month, you can add significant financial protection. Compared to the tens of thousands of dollars you could owe after an accident with an uninsured driver, the cost is minimal .
Myth 4: “My health insurance will cover my injuries.”
Partially true, but incomplete. Health insurance may cover your medical bills, but it won’t cover:
- Lost wages
- Pain and suffering
- Future medical needs
- Your deductible and copays
UM/UIM coverage provides comprehensive compensation that health insurance alone cannot match.
What Limits Should You Carry?
Insurance experts recommend carrying UM/UIM limits that match your liability coverage limits. In Arizona, for example, $100,000 per person / $300,000 per accident is often cited as the minimum adequate protection given the high cost of medical care and potential for income loss .
A Simple Rule of Thumb
| Your Liability Limits | Recommended UM/UIM Limits |
|---|---|
| State minimum | At least match your liability |
| $100,000/$300,000 | $100,000/$300,000 |
| $250,000/$500,000 | $250,000/$500,000 |
In states like Mississippi with new default matching rules, this alignment happens automatically unless you opt out in writing .
How to Check Your Coverage
Step 1: Find Your Declarations Page
Look for the section labeled “Uninsured Motorist” or “UM/UIM.” You’ll see limits listed, such as “$25,000/$50,000.”
Step 2: Verify They Match Your Liability Limits
If your UM/UIM limits are lower than your liability limits, consider increasing them. In most cases, the premium difference is minimal.
Step 3: Check for Property Damage Coverage
If you want coverage for vehicle repairs after an accident with an uninsured driver, ask about Uninsured Motorist Property Damage (UMPD) coverage .
Step 4: Consider an Umbrella Policy
If you have significant assets to protect, an umbrella policy can provide additional liability and UM/UIM coverage above your auto policy limits.
The Bottom Line: Protect Yourself
Uninsured and underinsured motorist coverage is one of the most valuable—and most overlooked—protections in auto insurance. In 2026, with new laws in New Jersey, Mississippi, and California reshaping the coverage landscape, it’s more important than ever to review your policy and ensure you’re adequately protected.
Key Takeaways:
- UM coverage protects you when the at-fault driver has no insurance
- UIM coverage covers the gap when their limits are too low
- One in eight drivers is uninsured—far more are underinsured
- UM/UIM is affordable—often just a few dollars a month
- 2026 laws in several states have changed coverage requirements
- Review your policy today to ensure you’re not leaving yourself exposed
As one attorney put it, skipping UM/UIM coverage “is like choosing not to buy an umbrella because it rarely rains where you live. When that unexpected storm hits, you’ll wish you had it” .
Don’t wait for the storm. Check your coverage today.