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

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Eden Prairie-based health care giant says it’s not aware of the launch of any new Justice Department activity as reported by the Wall Street Journal.

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.

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,

A top Republican in the U.S. Senate is questioning Medicare Advantage billing practices at UnitedHealth Group following a critical report last year from a federal watchdog agency and a Wall Street Journal article last week on a new investigation by the Justice Department.

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.

UnitedHealth Group had another rough day in trading Friday. Reports that the Department of Justice (DOJ) is investigating its Medicare Advantage insurance business sent the stock

The health insurance giant has called a new report from WSJ “misinformation,” but investors may not be so sure. Shares were down about 9% early Friday.

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

The Department of Justice has reportedly launched an investigation into UnitedHealth Group's Medicare billing practices, adding to the scrutiny the company is facing.