Why This Coverage Matters
Imagine you’re driving home after work.
Another driver runs a red light and crashes into your vehicle.
Fortunately, no one is seriously injured—but your car is badly damaged.
You exchange information and later discover the other driver doesn’t have auto insurance.
In another situation, the at-fault driver has insurance, but their policy limits are too low to cover all of the damage and medical expenses.
These two situations are different, and that’s where uninsured motorist (UM) and underinsured motorist (UIM) coverage may help, depending on your policy and state laws.
What Is Uninsured Motorist Coverage?
Uninsured motorist coverage is designed to help protect you if you’re involved in a covered accident caused by a driver who does not have the required auto insurance.
Depending on the policy and state, uninsured motorist coverage may help with eligible expenses such as:
- Medical bills
- Lost wages
- Pain and suffering (where applicable)
- Damage covered under the policy
- Certain hit-and-run incidents (subject to state law and policy terms)
Coverage varies by insurer and state.
What Is Underinsured Motorist Coverage?
Underinsured motorist coverage applies when the at-fault driver has insurance, but the available liability limits are not enough to cover the full amount of eligible damages.
Example:
- Your covered damages total $80,000.
- The at-fault driver’s liability insurance limit is $30,000.
Depending on your policy, underinsured motorist coverage may help with eligible remaining damages after the other driver’s policy has been exhausted.
The Biggest Difference
The simplest way to remember it is:
Uninsured Motorist (UM)
The at-fault driver has no insurance.
Underinsured Motorist (UIM)
The at-fault driver has insurance, but not enough to fully cover eligible damages.
Quick Comparison
| Feature | Uninsured Motorist (UM) | Underinsured Motorist (UIM) |
|---|---|---|
| Other driver has insurance | ❌ No | ✅ Yes |
| Other driver’s coverage is insufficient | ❌ Not Applicable | ✅ Yes |
| May help with medical expenses | ✅ | ✅ |
| May help after hit-and-run (where applicable) | Often | Usually No |
| Subject to policy limits | ✅ | ✅ |
Always review your policy and state regulations to understand available coverage.
What Does Uninsured Motorist Coverage Typically Cover?
Depending on the policy, uninsured motorist coverage may include:
Bodily Injury
May help pay eligible medical expenses if you or covered passengers are injured by an uninsured driver.
Lost Income
Some policies may provide benefits for certain lost wages related to covered injuries.
Hit-and-Run Accidents
Certain policies may treat qualifying hit-and-run incidents similarly to uninsured motorist claims, subject to state law and policy conditions.
What Does Underinsured Motorist Coverage Typically Cover?
Underinsured motorist coverage may help bridge the gap when the at-fault driver’s liability limits are insufficient.
It may assist with eligible:
- Medical expenses
- Rehabilitation costs
- Lost income
- Other covered damages
Coverage is subject to policy limits and state regulations.
Is UM/UIM Coverage Required?
Requirements vary by state.
Some states require insurers to offer UM/UIM coverage, while others require drivers to carry it unless they decline it in writing.
In other states, the coverage may be optional.
Always review your state’s insurance requirements.
Real-Life Examples
Example 1: Uninsured Driver
Alex is stopped at a traffic light.
An uninsured driver rear-ends his vehicle.
If Alex has uninsured motorist coverage and the claim qualifies, his policy may help cover eligible damages according to its terms.
Example 2: Underinsured Driver
Jessica suffers $90,000 in covered damages after another driver causes a serious accident.
The at-fault driver’s liability policy has a limit of $50,000.
If Jessica has underinsured motorist coverage, it may help with eligible remaining damages, subject to her policy limits.
Common Misunderstandings
Myth 1: Liability Insurance Protects Me From Uninsured Drivers
Not necessarily.
Your liability insurance is generally designed to protect others if you are responsible for a covered accident—not to compensate you when another uninsured driver causes the crash.
Myth 2: Every Driver Has Insurance
Although most drivers comply with insurance laws, some motorists drive without insurance or with coverage that may not fully cover serious accidents.
Myth 3: UM and UIM Are the Same
They are related but different.
UM applies when the at-fault driver has no insurance, while UIM applies when the at-fault driver’s insurance is insufficient.
How UM and UIM Claims Typically Work
Although every insurance company has its own procedures, uninsured and underinsured motorist claims generally follow a similar process.
Step 1: Report the Accident
After ensuring everyone’s safety, report the accident to local law enforcement if required by your state’s laws.
Collect important information such as:
- Driver information
- Vehicle details
- Insurance information (if available)
- Photos of the accident scene
- Witness contact information
Good documentation can make the claims process easier.
Step 2: Notify Your Insurance Company
Contact your insurer as soon as practical.
They may ask for:
- Police report
- Accident description
- Photos
- Medical records (if applicable)
- Repair estimates
Providing accurate information helps the insurer evaluate the claim.
Step 3: Claim Investigation
The insurance company reviews:
- Who was at fault
- Whether UM or UIM coverage applies
- Medical records
- Vehicle damage
- Policy limits
The claim is evaluated according to your policy terms and applicable state law.
Step 4: Claim Settlement
If the claim is covered, payment is generally determined based on:
- Policy limits
- Covered damages
- Deductibles (if applicable)
- Applicable state regulations
Coverage Limits
Like other types of insurance, UM and UIM coverage have limits.
Example:
UM bodily injury limits:
$100,000 per person
$300,000 per accident
These limits represent the maximum amount available under the policy for covered claims.
The specific limits available depend on the insurer and the policy selected.
State Laws Can Differ
Auto insurance laws vary across the United States.
Some states:
- Require UM coverage.
- Require insurers to offer UIM coverage.
- Allow drivers to reject UM/UIM coverage in writing.
- Have different minimum liability requirements.
Before purchasing coverage, review your state’s insurance requirements or consult your insurer.
Common Situations Where UM/UIM Coverage May Help
Depending on your policy, these coverages may apply in situations such as:
Uninsured Driver Causes an Accident
The at-fault driver has no insurance.
Underinsured Driver Causes Serious Injuries
The at-fault driver’s liability limits are insufficient to cover eligible damages.
Hit-and-Run Accident
Some policies provide coverage for qualifying hit-and-run accidents, subject to state law and policy conditions.
Pedestrian Accident
Depending on the policy and circumstances, UM/UIM coverage may extend to covered pedestrians injured by an uninsured or underinsured motorist.
Situations That May Not Be Covered
Coverage depends on the policy.
Examples where coverage may not apply include:
- Intentional acts
- Fraudulent claims
- Non-covered drivers
- Excluded vehicles
- Claims exceeding policy limits
Always review your insurance contract for specific exclusions.
How Much UM/UIM Coverage Should You Buy?
There is no universal answer.
Many people consider factors such as:
- Assets
- Income
- Medical expenses
- Existing health insurance
- State minimum liability limits
- Personal risk tolerance
Discussing coverage options with a licensed insurance professional can help you understand available choices.
Common Mistakes to Avoid
Rejecting UM/UIM Coverage Without Understanding It
In states where the coverage is optional, some drivers decline it without fully understanding how it works.
Review the benefits and limitations before making a decision.
Assuming Every Driver Has Adequate Insurance
Minimum liability limits may not be enough to cover serious accidents.
Forgetting to Review Policy Limits
Your coverage limits should reflect your financial needs and risk tolerance.
Review them periodically.
Not Reporting an Accident Promptly
Delays in reporting an accident may complicate the claims process.
Notify your insurer according to your policy requirements.
Expert Tips
- Review your state’s insurance requirements.
- Compare UM/UIM limits when requesting quotes.
- Keep copies of your insurance documents.
- Understand your deductibles and policy limits.
- Review your coverage annually.
- Update your policy after major life changes.
Frequently Asked Questions
Does uninsured motorist coverage pay for my medical bills?
Depending on your policy and state law, UM bodily injury coverage may help pay eligible medical expenses if an uninsured driver causes a covered accident.
Does UIM apply if the other driver has insurance?
Yes.
Underinsured motorist coverage is specifically designed for situations where the at-fault driver’s insurance is insufficient to cover eligible damages.
Is UM/UIM expensive?
The cost depends on many factors, including your insurer, coverage limits, location, and driving history.
Can UM/UIM cover passengers?
Many policies extend certain protections to covered passengers, subject to policy terms and applicable law.
Does UM/UIM cover vehicle repairs?
Some states and policies include uninsured motorist property damage coverage, while others do not.
Coverage varies significantly by state and insurer.
How to Decide Whether You Need UM/UIM Coverage
Every driver’s situation is different, but uninsured and underinsured motorist coverage may be worth considering if you want additional financial protection against drivers who have no insurance or insufficient insurance.
When evaluating this coverage, think about:
- The minimum liability insurance requirements in your state.
- Your personal savings and emergency fund.
- Your health insurance coverage.
- The value of your vehicle.
- How much financial risk you’re comfortable accepting.
Choosing appropriate coverage limits depends on your individual circumstances.
Questions to Ask Before Buying UM/UIM Coverage
Before purchasing or renewing your policy, consider asking your insurer:
- What are the available UM and UIM coverage limits?
- Does the policy include uninsured motorist property damage?
- Are hit-and-run accidents covered?
- What exclusions apply?
- How are claims handled?
- Are there discounts available if I bundle my insurance?
Having clear answers can help you compare policies more effectively.
Frequently Asked Questions
What does UM stand for?
UM stands for Uninsured Motorist coverage.
It is designed to help protect you if an at-fault driver has no auto insurance, subject to your policy terms and state law.
What does UIM stand for?
UIM stands for Underinsured Motorist coverage.
It may help when the at-fault driver’s insurance limits are not enough to cover eligible damages.
Does UM/UIM replace health insurance?
No.
UM/UIM coverage and health insurance serve different purposes.
How they interact depends on your policy, state law, and the circumstances of the claim.
Can passengers be covered?
Many policies extend certain UM/UIM protections to covered passengers, but coverage varies by insurer and policy.
Review your policy for details.
Is UM/UIM available in every state?
Availability and legal requirements vary by state.
Some states require insurers to offer the coverage, while others make it optional or have different rules.
Does UM/UIM have deductibles?
Whether a deductible applies depends on the type of coverage, your policy, and state law.
Review your policy documents for specific details.
Can I increase my UM/UIM limits?
Many insurers allow policyholders to select from different coverage limits, subject to company rules and state regulations.
What if the at-fault driver leaves the accident scene?
Certain hit-and-run incidents may qualify for uninsured motorist coverage, depending on your policy and state law.
Promptly report the incident to law enforcement and your insurer.
Should I review my UM/UIM coverage every year?
Yes.
Review your coverage annually or whenever you experience major life changes, purchase a new vehicle, or update other parts of your insurance policy.
Is UM/UIM worth considering?
Whether this coverage is appropriate depends on your personal financial situation, the insurance requirements in your state, and your tolerance for risk.
Discussing your options with your insurer or a licensed insurance professional can help you make an informed decision.
Common Mistakes to Avoid
Avoid these common misunderstandings:
- Assuming every driver has enough insurance.
- Declining UM/UIM coverage without understanding its purpose.
- Choosing coverage limits based only on the minimum requirements.
- Forgetting to review your policy after major life changes.
- Not understanding state-specific insurance rules.
- Waiting until after an accident to learn what your policy covers.
Being familiar with your policy before an accident occurs can make the claims process less stressful.
Key Takeaways
- Uninsured Motorist (UM) coverage generally applies when the at-fault driver has no insurance.
- Underinsured Motorist (UIM) coverage generally applies when the at-fault driver’s insurance is not sufficient to cover eligible damages.
- Coverage availability and requirements vary by state.
- Review policy limits, exclusions, and available options before purchasing.
- Compare quotes and coverage levels—not just premiums—when shopping for auto insurance.
Final Thoughts
Uninsured and underinsured motorist coverage can provide an additional layer of financial protection when another driver’s insurance is unavailable or insufficient. While the exact coverage depends on your policy and state laws, understanding the difference between UM and UIM can help you make more informed insurance decisions.
When comparing auto insurance policies, look beyond the monthly premium. Review available coverage limits, exclusions, deductibles, and optional protections. Periodically reviewing your policy can also help ensure your coverage continues to align with your financial goals and changing circumstances.
The best insurance decision is one based on a clear understanding of your risks, your budget, and the protection offered by your policy.