What Are The Largest Health Insurance Companies? 
The largest health insurance companies are UnitedHealthcare , Wellpoint , Kaiser , Aetna , Humana , HCSC , Coventry , Highmark and Independence Blue Cross . Now ... which companies offer the cheapest rates ? That 's not so easy since prices can vary , depending on where you live . By working with an experienced broker , you can easily compare the best rates from the top-rated companies . 