UnitedHealth Group shares fell nearly 6% in premarket trading on Thursday, after the Wall Street Journal reported that the U.S. Department of Justice was investigating the company for potential Medicare fraud.

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

Midday on Thursday, UnitedHealth Group's stock price had fallen more than 13%. Since a bad quarterly report, the company has seen its stock price fall by more than half, going from nearly $600 per share to $266 as of noon. The recent report is just one of a number of hardships the company has faced in recent months.

UnitedHealth Group's stock has seen a significant drop of more than 18% after a Wall Street Journal report revealed a criminal investigation by the Department of Justice.

UnitedHealth stock offers high risk/reward potential amid challenges like CEO resignation & DOJ investigation. Learn more about UNH stock here.

Another huge drop for shares of UnitedHealth Group appeared to be bleeding into shares of other major health insurers on Thursday. UnitedHealth shares were off by nearly 17% in recent trading following reports that the firm is facing a federal criminal probe into Medicare fraud.

Executives at UnitedHealth Group had egg on their faces on Tuesday morning. Just a few weeks ago, on April 17, the parent company of UnitedHealthcare released first-quarter results and downgraded its predictions for itself (or “revised its guidance,

U.S. stocks open lower, with weak UnitedHealth and Walmart shares weighing down the Dow. The Dow is down more than 100 points.

In true UnitedHealth fashion, the big health insurance stock was denying the Dow of a daily gain on Tuesday. The Dow was down 160 points, or 0.4%, but UnitedHealth stock was shaving 382 points off the index on its own with a nearly 17% drop.

Stephen Hemsley hasn’t been CEO at UnitedHealth Group in nearly a decade yet he’s never really left. Hemsley, 72, has remained chairman and a major shareholder in the health care behemoth — and now is back in the CEO suite and is expected to reinstate his brand of operational and financial discipline that turbocharged the company’s growth.