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UnitedHealth Group said Friday that Dirk C. McMahon, currently president and chief operating officer of Optum, would become CEO of its UnitedHealthcare division. McMahon replaces Steve Nelson, who is retiring from UnitedHealthcare. The nation's largest health insurer also said Daniel J. Schumacher, currently president and chief operating officer of UnitedHealthcare, was named president and chief operating officer of Optum, the company's health-services arm.