Envision Healthcare Holdings, Inc. is a provider of physician-led, outsourced medical services in the United States. The Company offers a range of clinically-based and coordinated care solutions across the patient continuum from medical transportation to hospital encounters to comprehensive care alternatives in various settings. The Company conducts its business primarily through two operating subsidiaries, EmCare Holdings, Inc. (EmCare) and American Medical Response, Inc. (AMR). The Company markets its services primarily under the EmCare and AMR brands. EmCareis a provider of integrated facility-based physician services, including emergency, anesthesiology, hospitalist/inpatient care, radiology, tele-radiology and surgery. EmCare also offers physician-led care management solutions outside the hospital. In March 2014, the Company announced that American Medical Response (AMR) subsidiary of the Company acquires Life Line Ambulance in Prescott, Arizona and MedStat EMS, Inc.