InHospital acquisitions were popular among private equity firms from 2000 to 2012. But many firms struggled to make money from those acquisitions and have turned their attention to more profitable slices of the health care economy. In particular, private equity has been gobbling up staffing service for emergency rooms and then taking the doctors out of the hospital’s insurance network. As a result, many people return home from the emergency room with massive bills they thought would be covered by their insurance company. This phenomenon is known as “surprise billing.” Today, two companies owned by private equity firms, Envision Healthcare and TeamHealth, have “a 30 percent share of the market for outsourced emergency room doctors.Read about