UnitedHealth Group Incorporated (UNH) is facing a wave of challenges, with little room to catch a break. The latest blow? A criminal investigation into possible Medicare fraud was reported by the Wall Street Journal. This comes on the heels of a disappointing first-quarter performance, where the company missed both earnings and revenue estimates. Rising costs, primarily tied to Medicare Advantage plans and the Optum health services segment, and higher utilization trends, are weighing heavily on margins.In a ...