According to the American Anthropological Association, code 99 is any medical emergency where the patient is not breathing and/or has no heart rate.
When "Code 99" is announced over the hospital loudspeakers, this is the signal for a team of doctors, nurses, and technicians to assemble in order to make strenuous attempts to resuscitate the dying patient.
Many institutions use colors to identify specific types of emergencies. Code Red and Code Blue are both terms that are often used to refer to a cardiopulmonary arrest, but other types of emergencies may be given code designations, too. Colors, numbers, or other designations may follow a code announcement to identify the type of emergency that is occurring. Learn more at WebMD.
Check out some tips that will help you prepare for a medical emergency at AARP.org
Speaking of hospital emergency, the opening shots of Code Black, Ryan McGarry's riveting, you-are-there documentary about life and death in the emergency room of Los Angeles County/USC Medical Center, look like total chaos. Read more at philly.com.