Feb 25 (Reuters) - U.S. Senator Chuck Grassley has sent a letter to UnitedHealth UNH.N CEO Andrew Witty on Monday demanding detailed information on the company's Medicare billing practices, the Wall Street Journal reported.
UnitedHealth did not immediately respond to a Reuters request for comment.
(Reporting by Sneha S K; Editing by Vijay Kishore)
((Sneha.SK@thomsonreuters.com;))