As CEO for more than a decade, Stephen Hemsley built up UnitedHealth Group, now a $400 billion healthcare behemoth. With his return to the top job, the company will learn whether his playbook still works.

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

UnitedHealth CEO Andrew Witty is stepping down for personal reasons and the nation’s largest health insurer suspended its full-year financial outlook due to higher-than-expected medical costs. Hemsley was UnitedHealth Group CEO from 2006 to 2017. He will remain chairman of the company’s board. Witty will serve as a senior adviser to Hemsley.

UnitedHealth Group CEO Andrew Witty abruptly stepped down from the health insurance and care conglomerate on Tuesday, citing personal reasons, capping the end of a tumultuous four-year tenure that included the killing of the company’s top insurance executive .

UnitedHealth Group Chief Executive Officer Andrew Witty stepped down, effective immediately, "for personal reasons", the company said Tuesday. “Leading the people of UnitedHealth Group has been a tremendous honor as they work every day to improve the health system, and they will continue to inspire me,” Witty said in a statement shared by UHG.

Por MICHELLE CHAPMANEl director general de UnitedHealth, Andrew Witty, dejará su cargo por razones personales y la aseguradora de salud más grande del país suspendió su

Shares of UnitedHealth Group, Inc. (UNH) fell over 17% on Tuesday after the health insurance giant said CEO Andrew Witty would step down for personal reasons, with chairman and former chief executive Stephen Hemsley taking his place.

UnitedHealth Group said its Chief Executive Andrew Witty resigned as of Tuesday, and the company suspended its annual forecast due to surging medical costs, sending shares plunging nearly 18% to a four-year low.