UnitedHealth Group shares drop 16.5% after inquiry into alleged Medicare fraud
1. UnitedHealth is under investigation for potential criminal Medicare fraud. 2. Shares fell 16.5%, and stock value has halved this year. 3. CEO Andrew Witty announced resignation amid financial outlook suspension. 4. Previous civil investigation into Medicare practices raised compliance questions. 5. UnitedHealth asserts integrity of Medicare Advantage program amidst scrutiny.