Uninsured/underinsured Motorist coverage

Underinsured coverage, also known as UM/UIM, provides coverage if an at-fault party either does not have insurance, or does not have enough insurance. In effect, the insurance company pays the insured medical bills, then would subrogate from the at fault party. This coverage is often overlooked and very important. In Colorado for example, it was estimated in 2007 that 24% of drivers did not carry the state minimum liability limits required by law. Unfortunately, this number goes up significantly during recessions. In some areas, it is estimated that 1 out of every 3 drivers don't carry insurance. Usually the limits match the liability limits. Some insurance companies do offer UM/UIM in an umbrella policy.

In the United States, the definition of an uninsured/underinsured motorist, and corresponding coverages, are set by state laws.