The Iowa Republican’s letter to the company cites findings from a series of Wall Street Journal articles.

UnitedHealth Group saw its share price fall on Friday after the Wall Street Journal reported that it was facing a DOJ investigation.

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The Wall Street Journal says the Justice Department in recent months has launched a new investigation into UnitedHealth Group’s billing practices as a civil fraud investigation looks at the use of diagnosis data to trigger extra payments to the company’s Medicare Advantage plans.

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

D: Noon on Feb. 21The Department of Justice is probing UnitedHealth Group's billing practices in Medicare Advantage, according to a report from the Wall Street Journal. | The Department of Justice is probing UnitedHealth Group's billing practices in Medicare Advantage,

UnitedHealth Group Inc. (NYSE: UNH) shares are trading lower Tuesday after the Wall Street Journal reported that Senator Chuck Grassley launched an inquiry into the company's Medicare billing practices.

The probe is analyzing the company’s practice of frequently logging diagnoses that trigger larger payments to its Medicare Advantage plans, according to a report.

UnitedHealth Group (UNH) had another rough day in trading ... The civil fraud investigation, first reported by the Wall Street Journal, examines how UnitedHealth records diagnoses that boost ...

UnitedHealth Group stock is sinking Friday on reports the Justice Department is investigating the health insurer. Here's what to know.

The Iowa Republican’s letter to the company cites findings from a series of Wall Street Journal articles.

The Wall Street Journal says the U.S. Justice Department in recent months has launched an investigation into UnitedHealth Group’s billing practices to see if the company fraudulently used ...