The Chief Medical Officer is responsible for the physical health of the entire crew, but does more than patch up injured crew members. His/her function is to ensure that they do not get sick or injured to begin with, and to this end monitors their health and conditioning with regular check ups. If necessary, the Chief Medical Officer can remove anyone from duty, even a Commanding Officer. Besides this s/he is available to provide medical advice to any individual who requests it.
Additionally the Chief is also responsible for all aspect of the medical deck, such as the Medical labs, Surgical suites and Dentistry labs.
S/he also is a department head and a member of the Senior Staff and responsible for all the crew members in her/his department and duty rosters.