“Skilled nursing facility” means a health facility which provides the following basic services: skilled nursing care and supportive care to patients whose primary need is for availability of skilled nursing care on an extended basis. It provides 24-hour inpatient care and, as a minimum, includes medical, nursing, dietary, pharmaceutical services and an activity program. The facility shall have effective arrangements, confirmed in writing, through which services required by the patients, but not regularly provided within the facility, can be obtained promptly when needed.