Overview Responsible for providing a variety of patient care activities under the supervision of a physician, physician extender, or registered nurse in accordance with established guidelines and standards. Duty assignments vary and include, but are not limited to front office and back office functions. Responsibilities Responsible for providing a variety of patient care activities under the supervision of a physician, physician extender, or registered nurse in accordance with established guidelines and standards. Duty assignments vary and include, but are not limited to front office and back office functions.