Catamaran Corporation (formerly SXC Health Solutions) is a Schaumburg, Illinois based pharmacy benefit management company that sells services related to pharmacy benefit management and medical record keeping to businesses in the United States. Working independently of the government and insurance companies allows it to operate as a third party verifier; the RxCLAIM online claim processing system allows for prescription drug claims to be processed online if the customer lives in and fills his/her prescription in the United States. The system has no way of accommodating customers who live/work in foreign countries but have health care/prescription drug insurance through a retirement system such as the Michigan Public School Employees Retirement System. SXC has three separate but interrelated business segments which deal with prescription drug programs. For 2013 23% of company revenue came from Cigna Corporation.