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Written by:
Shivani Gite
Contributing Writer
Shivani Gite is a personal finance and insurance writer with a degree in journalism and mass communication. She is passionate about making insurance topics easy to understand for people and helping them make better financial decisions. When not writing, you can find her reading a book or watching anime.
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Reviewed by:
Laura Longero
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Executive Editor
Laura is an award-winning editor with experience in content and communications covering auto insurance and personal finance. She has written for several media outlets, including the USA Today Network. She most recently worked in the public sector for the Nevada Department of Transportation.

What does underinsured motorist bodily injury coverage do?

Underinsured motorist bodily injury insurance (UNDUM) covers you, the insured members of your household (resident relatives) and your passengers in your insured car for bodily/personal injuries, damages, or death caused by an at-fault driver with insufficient insurance (is underinsured).  It also covers you and others listed on your insurance policy when riding in other cars.

Underinsured motorist bodily injury coverage varies according to the terms of your policy and state laws, but in general, it pays the difference between what’s covered by the other driver’s insurance coverages, which can’t meet the cost of your damages, and the bodily injury limits listed on your policy.

Policy limits for underinsured motorist bodily injury coverage are per person and per accident and coverage is written as such.  For example, $25,000/$50,000 means that the maximum payout per person is $25,000 and the maximum payout for all people injured in one accident is $50,000.  This coverage may also be written as 25/50.

If the UNDUM limits you purchase are lower than an accident’s costs, you’ll be responsible for paying the amounts over your limits unless you’re covered by health insurance that will cover these medical expenses.

An underinsured motorist may be sold with uninsured motorist coverage or separately depending upon the state and insurance carrier.

Is underinsured motorist bodily injury coverage mandatory?

Depending upon where you live, underinsured motorist bodily injury may be mandatory.  When underinsured motorist bodily injury coverage it is required, it may be bundled together with uninsured motorist coverage and referred to uninsured/underinsured motorist coverage. 

The insurance industry recommends underinsured motorist bodily injury liability coverage of $100,000 per person and $300,000 per accident (referred to as 100/300), if you can afford these higher limits.

What happens if I don’t have underinsured motorist bodily injury coverage?

Suppose this coverage is optional in your state and you choose to go without. In that case, you may be left to pay for medical expenses arising from an accident caused by an underinsured motorist — unless the at-fault driver has the money to pay for your medical expenses that exceeded their bodily injury liability limits.

— Michelle Megna contributed to this story.

Laura Longero

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Laura Longero

Executive Editor

Laura is an award-winning editor with experience in content and communications covering auto insurance and personal finance. She has written for several media outlets, including the USA Today Network. She most recently worked in the public sector for the Nevada Department of Transportation.

John McCormick

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John McCormick

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John is the editorial director for CarInsurance.com, Insurance.com and Insure.com. Before joining QuinStreet, John was a deputy editor at The Wall Street Journal and had been an editor and reporter at a number of other media outlets where he covered insurance, personal finance, and technology.

Leslie Kasperowicz

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Leslie Kasperowicz

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Leslie Kasperowicz is an insurance educator and content creation professional with nearly two decades of experience first directly in the insurance industry at Farmers Insurance and then as a writer, researcher, and educator for insurance shoppers writing for sites like ExpertInsuranceReviews.com and InsuranceHotline.com and managing content, now at CarInsurance.com.

Nupur Gambhir

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Nupur Gambhir

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Nupur Gambhir is a content editor and licensed life, health, and disability insurance expert. She has extensive experience bringing brands to life and has built award-nominated campaigns for travel and tech. Her insurance expertise has been featured in Bloomberg News, Forbes Advisor, CNET, Fortune, Slate, Real Simple, Lifehacker, The Financial Gym, and the end-of-life planning service.

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Contributing Writer

Shivani Gite is a personal finance and insurance writer with a degree in journalism and mass communication. She is passionate about making insurance topics easy to understand for people and helping them make better financial decisions. When not writing, you can find her reading a book or watching anime.