UnitedHealth Group, which operates under health-benefits provider United Healthcare in about two dozen states, may stop offering healthcare plans on Obamacare's marketplace exchanges beginning in 2017. This warning comes after UnitedHealth Group lowered its full-year profit expectations as a direct result of Obamacare. If United Healthcare decides to stop offering plans via Obamacare's exchanges, approximately 500,000 people will need to find new plans, and potentially new primary care physicians, in 2017. The insurer also noted that it would stop actively advertising to potential Obamacare enrollees in order to minimize its losses.