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Uninsured & Underinsured Motorist Coverage: Why It Is Essential Protection

Why carrying UM/UIM bodily injury and property damage coverage is critical, state uninsured driver percentages, and how stacking works.

By the PolicyCompass Editorial Team 8 min read

According to comprehensive data from the Insurance Research Council (IRC), roughly one out of every eight drivers operating on American roads is completely uninsured. In certain high-cost states such as Mississippi, Michigan, and Florida, the uninsured driver rate exceeds 20% to 25%.

If an uninsured or hit-and-run driver crashes into your vehicle, their lack of financial responsibility should not become your financial ruin. Uninsured and Underinsured Motorist coverage provides the safety net that insulates you and your family.

The Critical Distinction Between UM and UIM

  • Uninsured Motorist (UM): Protects you when the at-fault driver has zero insurance, or when you are the victim of a hit-and-run driver who cannot be identified.
  • Underinsured Motorist (UIM): Protects you when the at-fault driver carries liability insurance, but their policy limits are insufficient to cover your total hospital bills and medical damages.

A Realistic Underinsured Motorist Scenario

Imagine you are struck by a driver who carries state-minimum bodily injury liability of $25,000. You suffer severe injuries requiring spinal surgery and three months of rehabilitation, resulting in $95,000 in medical bills and lost earnings.

The at-fault insurer pays their policy maximum: $25,000.

You are left with a $70,000 shortfall. If you carry UIM coverage with a $100,000 limit, your own policy steps in and covers the remaining $70,000 up to your coverage threshold. Without UIM, you must attempt to collect from the at-fault driver’s personal assets — a driver who carried minimum limits and typically has few liquid funds to seize.

Uninsured Motorist Property Damage (UMPD)

In addition to medical coverage (UMBI), many states offer Uninsured Motorist Property Damage (UMPD):

  • Pays to repair your car if struck by an identified uninsured driver.
  • Often carries a lower deductible (e.g., $100 to $250) than your standard collision deductible ($500 or $1,000).
  • If your vehicle is older and you do not carry collision insurance, UMPD is the only mechanism that protects your car against uninsured motorists.

Sources

Frequently asked questions

What does uninsured motorist bodily injury (UMBI) cover?
UMBI pays for medical bills, lost wages, rehabilitation, and pain and suffering when you or your passengers are injured by an uninsured driver or a hit-and-run driver.
Is uninsured motorist coverage mandatory?
In approximately 20 states, UMBI is required by law. In other states, insurers must offer it, but drivers can decline it in writing.

About the author

Written by the PolicyCompass Editorial Team, which researches and maintains every guide on this site. Read more about our editorial standards or contact us with corrections.

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