While there is no global standard for Emergency Codes used by hospitals, most countries have their own set of hospital codes they follow -
Australia - Australian Standard 4083
Canada - British Columbia Ministry of Health
US - Hospital Association of Southern California (HASC),
Oregon Association of Hospitals & Health Systems, Florida Hospital Association etc
These codes are often displayed at placards throughout the hospital for easy reference. In case of an emergency, they help notify the doctors and hospital staff with minimal confusion, thus preventing panic among patients and visitors at the hospital.
Here are the most commonly used codes in Hospitals by color and the emergencies they represent -