Ingenix, the UnitedHealth Group subsidiary that faced scrutiny over its databases used by insurers to set reimbursement rates for out-of-network care, said it has acquired a Franklin, TN-based healthcare information technology company. The acquisition of AIM Healthcare Services Inc., which helps payors and hospitals to manage claims, expands Ingenix's business of ensuring accuracy of payments at a time when eliminating unnecessary paperwork is seen as a key part of any reform of the nation's healthcare system, according to The Tennessean.