(a) Subject to the rules and regulations established by the department, under the supervision of the hospital director, the hospital administrator shall be responsible for the planning, development, direction, management and supervision of all administrative and supportive services in the hospital facility. These services include, but are not limited to, all of the following:

1. (1) All administrative functions, such as personnel, accounting, budgeting, and patients’ accounts.
2. (2) All life-support functions, such as food services, facility maintenance and patient supplies.
3. (3) All other business functions.