The TV celebrity and Trump nominee has pledged to divest from most of his financial interests. But they touch nearly every corner of health care, from insurance to blood pressure cuffs and vitamins, leading experts and lawmakers to doubt he could make impartial decisions.

UnitedHealth Group is facing significant challenges to its finances, operations and reputation. Here's a look back at the company's turbulent past 12 months.

UnitedHealth Group faces unconfirmed allegations of inflating risk ratings for reimbursements, causing market panic despite no DOJ confirmation or

The selloff came as more than $2.7 trillion worth of options expired, an event which typically spurs heightened volatility.