(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.

We don't need to dwell on the lack of detail behind Andrew Witty stepping down as CEO of UnitedHealth ( UNH) for "personal reasons." There are plenty of public reasons to change course at a business that has become a political lightning rod and Wall Street letdown.

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

Stephen Hemsley is resuming duties as chief executive at health care giant UnitedHealth Group in a surprise transition as the company’s recent financial woes have intensified. Current CEO Andrew Witty stepped down for personal reasons,

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

Even UnitedHealth will struggle to overcome parasitic medical costs that Warren Buffett once called a tapeworm eating away at U.S. economic competitiveness. The $300 billion healthcare conglomerate reinstalled Chairman Stephen Hemsley as CEO and yanked its financial guidance.

UnitedHealth's stock has plunged nearly 40% year-to-date as the company has battled a series of crises. Can the healthcare giant turn it around? Seeking Alpha analysts weigh in.

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.