News roundup: Ray Nagin to be featured on CNBC’s American Greed … UnitedHealthcare pays $3.4M in bonuses to physicians who work with Medicaid enrollees … Cox unleashes improved Contour system in Baton Rouge

    Must-see TV: CNBC’s documentary series American Greed is featuring former New Orleans Mayor and now federal inmate Ray Nagin on its season premiere episode, scheduled to run at 9 p.m. Thursday. A sy…

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