Sen. Chuck Grassley, chairman of the Senate Judiciary Committee, sent UnitedHealth Group CEO Andrew Witty a letter demanding detailed information on the company’s Medicare billing practices Monday. The letter—which cited findings from a series of Wall Street Journal articles published over the last year—said “the apparent fraud,

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