The US Justice Department has been investigating UnitedHealth Group Inc.’s Medicare billing practices, a person familiar with the matter said. The company’s stock fell sharply. The Wall Street Journal first reported the civil fraud investigation into whether the insurance giant’s practices related to patient diagnoses force higher payments from the government’s Medicare Advantage program.

UnitedHealth shares turned lower in midday trading following reports of another probe into the nation's biggest health insurance group and its ties to government-funded healthcare programs. The Wall Street Journal reported that Sen.

Hi, it’s John in New York. I’ve spent years following a story about how whistleblowers alleged systematic fraud at private Medicare Advantage plans. A reported investigation at one of the biggest companies in that business jolted investors last week.

U.S. Senator Chuck Grassley requested detailed information on UnitedHealth's Medicare billing practices, in a letter to CEO Andrew Witty on Monday, amid reports suggesting the insurer may have leveraged billing rules to its advantage.

UnitedHealthCare is under investigation by the Department of Justice again for its Medicare Advantage billing practices. This is one of several legal battles and extraordinary mishaps the insurer has faced in recent years, including the murder of its CEO and a massive cyberattack.

As original Medicare faces funding shortfalls, Dr. Oz may shift to private insurance providers through Medicare Advantage. Here's what we know so far.

UnitedHealthcare gained the most Medicare Advantage members during annual enrollment while Humana lost the most policyholders.

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 Justice Department is probing diagnoses and practices that triggered extra payments to UnitedHealth’s Medicare Advantage plans, people familiar with the matter say.

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

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.