UnitedHealth (UNH) is among America's largest insurers and is a company that's become pretty divisive in the investing world among those who believe in the company's earnings growth potential and those who bemoan how the company earns those profits. Concerns around the company's denials program and other key issues have plagued the stock, following the murder of its former CEO. And while various practices have been put in place and the company appears to be reviewing how its operating model can best serve ...