1. In a medical center facility, doctor that is asked to do final decision-making in complicated or difficult cases by evaluating appropriateness of admission, judging efficiency of services for level of care and place of service, and in seeking appropriate care alternatives for selected patients. Additionally, a PA can act as a negotiator and educator with practicing physicians and as liaison between the utilization management company and the provider community in understanding and shaping more efficient and cost-effective medical practice. 2. Individual hired to improve the revenue cycle. Also called business consultant. 3. Individual who assists patients in selecting medical insurance and in choosing a physician.