UIM in the auto insurance field stands for Underinsured Motorist Bodily Injury.Underinsured Motorist can also be referred to as UNDUM as well by some in the insurance industry.
Underinsured Motorist is usually sold with Uninsured Motorist Bodily injury coverage (UM) so we will explain both coverages to you.UM covers you, the insured members of your household and your passengers for bodily/personal injuries, damages or death caused by an at-fault uninsured or hit-and-run driver (if the policy allows for an unknown vehicle or phantom vehicle). If you are involved in an accident where the other driver is at fault but has no insurance, your policy will cover your medical expenses, up to the limit on your policy.
If the other driver involved in an accident is uninsured, this coverage pays up to the limit you purchase. The coverage limits refer to the maximum amount that will be paid per person, per incident, respectively.
[Let CarInsurance.com help you find affordable auto insurance now.] UIM is similar but covers you, the insured members of your household and your passengers for injuries, damages or death caused by the negligence of a person with insufficient insurance, thus the person is found to be underinsured. If you have an accident with a person whose coverage cannot meet your damages, your policy will meet the difference-up to the limit of Liability listed on your policy.
If the other driver involved in an accident is underinsured, this coverage typically pays any difference between what the other driver's insurance covers and what your Bodily Injury coverage will pay. The coverage limits refer to the maximum amount that will be paid per person, per incident, respectively. If the 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.
There are other types of Underinsured and Uninsured auto insurance as well. There is Underinsured Motorist Property Damage (UNDPD) which covers when property damage is sustained by an insured and the negligent operator possesses insurance, but the limits of liability carried by the negligent driver are not sufficient to cover the damages.
Then there is Uninsured Motorist Property Damage (UMPD) which covers your auto when property damage is sustained by an insured and the negligent operator does not possess insurance.
State laws and the terms of an auto insurance policy may cause the actual coverages for UM, UIM, UNDPD and UMPD to differ so ask an insurance agent about these coverages specifically if you thinking about buying them as part of your car insurance policy. Once you have the policy you can read through the terms of it for more information on what your particular coverages are for Unisured and Underinsured Motorist.
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For more information on the various types of car insurance coverages please go to our Learning Center where you can find our Insurance Coverages explained, our Auto Insurance Glossary and many helpful articles.Types of Auto Insurance Coverages Explained is one such article you may find of help when you are looking for help on understanding auto insurance and purchasing a policy. | 
