INSURANCE QUOTESSTART HERE Underinsured Motorist Endorsement Definition Underinsured Motorist Endorsement covers individual’s medical cost who’s involved in an accident caused by the insured and if his/her insurance is limited. Auto Insurance Articles Uninsured Motorist Coverage Unearned Premiums Additional Interest Subrogation Accident-Year Statistics Additional Car Addendum ACV Accident Severity Accident Insurance Auto Insurance Resources Auto Insurance Definitions Auto Insurance Q&A