Hospitals use the Hospital Incident Command System (HICS) to respond to emergencies. It provides a standardized response framework that hospitals and health care organizations can use to mitigate the effect of emergencies or other incidents. The HICS system supports emergency management planning, and allows for quick response and recovery.
Additional information can be found here: https://emsa.ca.gov/disaster-medical-services-division-hospital-incident-command-system-resources/