** At least 3 brokerages cut PT on UnitedHealth Group UNH.N, but maintain "outperform" rating after a report of a DOJ criminal probe over alleged Medicare fraud

** Mizuho cuts to $350 from $515, Bernstein cuts to $377 from $594, and RBC Capital Markets cuts to $355 from $525

** Mizuho says there was "high level of uncertainty," and that the new estimates reflect the operational challenges

** Mizuho suspects negative news around UNH over last few months had "an adverse impact on physicians coding more conservatively"

** "We are encouraged that the business remains profitable, which along with stronger MA rates for 2026, should ease the lift back to target margin in 2026," says RBC Capital Markets** All 3 lowered their adj profit estimates for 2025

** As of last close, stock down 45.8% YTD

(Reporting by Siddhi Mahatole)

((siddhi.mahatole@thomsonreuters.com))