UnitedHealth Group stock was sliding again Thursday as the market took in a report in the Wall Street Journal that the U.S. Department of Justice has launched a criminal fraud investigation of Medicare billing practices,

(Reuters) -UnitedHealth Group CEO Stephen Hemsley will get an annual base salary of $1 million and a one-time $60 million equity award as he returns to the top role at a tough time for the healthcare conglomerate.

UnitedHealth Group CEO Stephen Hemsley, who replaced Andrew Witty, said he has the right strategy in place “for the era ahead.”

Stephen Hemsley ran UnitedHealth Group for more than a decade. It's a different company after four years with Andrew Witty in charge.

UnitedHealth Group faces a significant setback as its shares fall by nearly 13% following reports of a Department of Justice investigation into potential Medicare fraud. This crisis comes amid other challenges like the CEO's departure and withdrawal of forecasts,

UnitedHealth faces valuation reset amid CEO change, regulatory probes, and cost overruns. Click here for a full analysis of UNH stock.

Former CEO and current chairman Stephen Hemsley is stepping back into the top job following the abrupt resignation of Andrew Witty, UnitedHealth said.

UnitedHealthcare stock plunged again on Thursday after a new report in the WSJ said the company is facing a Medicare fraud probe.