UnitedHealth Group Incorporated (NYSE:UNH) is in negotiations to acquire Chilean health care company Banmedica S.A. (SNSE:BANMEDICA) in a deal that could be worth more than $3 billion. In a statement, Minnetonka-based UnitedHealth confirmed it's in "non-binding exploratory" talks regarding the acquisition. he deal for Banmedica S.A. would include paying about $2.8 billion for the Chilean company plus assuming $520 million in debt, according to a research note this week form analysts at Deutsche Bank.