Code 55 is a hospital emergency alert used in some facilities to signal a psychiatric or behavioral emergency, typically when a patient or visitor becomes aggressive, combative, or poses an immediate safety threat. It is not a universal code. Hospitals across the United States use different numbering systems, and Code 55 can mean different things depending on the facility. In most hospitals that use it, though, it calls a specialized response team to de-escalate a dangerous situation without resorting to physical force whenever possible.
What Triggers a Code 55
A Code 55 is typically called when someone in the hospital, usually a patient, becomes physically aggressive, threatens staff or other patients, or behaves in a way that creates an immediate risk of harm. This can happen in emergency departments, psychiatric units, or general medical floors. The situations that lead to a Code 55 vary widely: a patient experiencing a psychotic episode, someone in severe pain or confusion lashing out, a visitor becoming threatening, or a patient attempting to harm themselves.
Any staff member who witnesses the situation can activate the code, usually by calling the hospital operator or pressing an alert button. Once called, it brings a trained response team to the location quickly.
Who Responds and What Happens
When a Code 55 is announced overhead or through the hospital’s alert system, a designated behavioral emergency team responds. This team often includes security personnel, nurses, a charge nurse or supervisor, and sometimes a psychiatrist or mental health professional. The size and makeup of the team depend on the hospital.
The first priority is verbal de-escalation. Team members are trained to use calm, non-threatening communication to reduce the person’s agitation. This includes maintaining a safe distance, speaking in a low and steady voice, avoiding commands or confrontational language, and giving the person space to express what they’re feeling. The goal is to resolve the situation without physical intervention.
If verbal techniques don’t work and the person remains a danger to themselves or others, the team may use physical restraint or, in some cases, medication to sedate the person. These are considered last-resort measures. Hospitals have strict protocols around when and how restraints can be applied, and patients placed in restraints must be monitored continuously.
Why Hospital Codes Aren’t Standardized
One reason this code is confusing to search for is that there is no single national standard for hospital emergency codes in the United States. A Code 55 at one hospital might be called a Code Gray, Code Silver, or Code Green at another. Some hospitals use color-based systems, others use numbers, and some use a mix of both.
This inconsistency has been a recognized safety concern for years. Healthcare workers who move between facilities may not know what a particular code means, and visitors or patients hearing an unfamiliar code overhead have no way to understand it. The Washington State Hospital Association developed guidance recommending that hospitals shift to plain-language announcements instead of coded alerts. Under this framework, rather than announcing “Code 55,” a hospital would say something like “Alert: Behavioral Emergency, Third Floor, Room 312.” The format follows a structure of alert type, event, location, and description. This approach is designed to increase safety for patients, visitors, and staff by making the situation immediately clear to everyone who hears it.
Some hospitals have adopted plain-language systems. Many others still use traditional codes, including numbered ones like Code 55. If you’re in a hospital and hear an unfamiliar code, the nursing staff at the nearest station can tell you whether it affects your area.
Other Common Hospital Codes
Because the person searching for Code 55 may also encounter other codes during a hospital visit, here are some of the more widely used ones:
- Code Blue: A patient is in cardiac or respiratory arrest and needs immediate resuscitation.
- Code Red: A fire has been reported in the building.
- Code Pink: An infant or child abduction is suspected.
- Code Gray: Used in many hospitals for the same purpose as Code 55, a combative or aggressive person.
- Code Silver: An active shooter or person with a weapon on the premises.
- Code Orange: A hazardous material spill or exposure.
Again, these vary by hospital. Code Gray at one facility could mean something entirely different at another. The color or number itself matters less than the hospital’s internal training and response plan behind it.
What It Means If You Hear One
If you’re a patient or visitor and hear a Code 55 announced overhead, it typically does not require you to do anything unless hospital staff give you specific instructions. The response team is heading to a particular location to manage a specific situation. Stay where you are, keep your door closed if you’re in a patient room, and follow any directions from staff. These situations are generally resolved within minutes, and the team is trained to contain the event to the area where it’s happening.