UnitedHealth dips after WSJ reports details of US Senate investigation

Shares of UnitedHealth Group UNH.N down 1.2% at $339.72 premarket after WSJ reports findings of U.S. Senate's investigation into co's Medicare Advantage practices

Senate committee alleges insurer used aggressive tactics to collect diagnoses that boost government payments under risk-adjustment rules, according to report

In Medicare Advantage, the federal government pays insurers a fixed amount per member, with extra payments for patients with costly conditions

Report makes no formal recommendations and alleges no wrongdoing

UNH did not immediately respond to Reuters request for comment

Stock fell 34.4% over the past year