Editing Preferred provider organization (section)

== PPO ==
Other features of a preferred provider organization generally include utilization review, where representatives of the insurer or administrator review the records of treatments provided to verify that they are appropriate for the condition being treated rather being largely, or solely, being performed to increase the number of people due. Another near-universal feature is a pre-certification requirement, in which scheduled (non-emergency) hospital admissions, and in some instances, outpatient surgery, must have the prior approval of the insurer and must often undergo "utilization review" in advance.<ref>{{Cite book|last=Haas|first=Marjorie Segel|url=https://books.google.com/books?id=bBa07Z9sFdAC&q=%22Preferred+provider+organization%22+-wikipedia|title=Preferred Provider Organization|date=1991|publisher=U.S. Department of Labor, Bureau of Labor-Management Relations and Cooperative Programs|language=en}}</ref>