Yahoo Finance

Shares of UnitedHealth Group (UNH) stumble lower in Friday's trading session after the Wall Street Journal reported that the Department of Justice (DOJ) is investigating the company's Medicare Advantage billing practices for alleged fraud. However, UnitedHealth has strongly refuted these claims, calling the allegations "outrageous" and "false."

Yahoo Finance senior health reporter Anjalee Khemlani breaks down the details.

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This post was written by Angel Smith and updated by Luke Carberry Mogan.