UnitedHealthcare signage is displayed on an office building in Phoenix, Arizona, on July 19, 2023. Shares of UnitedHealth Group fell more than 3% in premarket trading on Tuesday. UnitedHealth Group's report signals that elevated medical costs in Medicare Advantage plans may not ease anytime soon for the broader health insurance industry. UnitedHealthcare, the insurance arm of UnitedHealth Group, is the nation's largest provider of those privately run Medicare plans. Higher expenses in Medicare Advantage pla ...