(November 17, 2016, 10:12 AM EST) -- ST. PAUL, Minn. — UnitedHealth Group Inc., United Healthcare Services Inc., UnitedHealthcare Inc., Optum Inc. and OptumRx Inc. are engaging in a “clawback” billing scheme that results in their customers overpaying for their prescription medications, one customer alleges in a class complaint filed Nov. 15 in the U.S. District Court for the District of Minnesota (Kathy L. Fellgren, et al. v. UnitedHealth Group Incorporated, et al., No. 16-3914, D. Minn.)....