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.

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,

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 faced two new investigations from federal lawmakers. The first was a senator’s probe into its Medicare Advantage billing practices, and the second was a Congressman's investigation into a decline in care quality at Optum-owned clinics in New York.

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

UnitedHealth Group (UNH) is under fire over its Medicare billing practices. The Wall Street Journal reported Friday that the U.S. Department of Justice (DOJ) has launched a civil fraud investigation into how the company records diagnoses that lead to extra payments for its Medicare Advantage plans.

The new civil fraud investigation is examining UnitedHealth's practices for recording diagnoses that trigger extra payments to its Medicare Advantage plans, including at physician groups the insurance giant owns, the report added. DoJ and UnitedHealth did not immediately respond to a Reuters request for comment.

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.