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Hospital Emergency Codes Code Grey Hospital . Yes, this code is used the same as code white. It might indicate that there is a dangerous person in a public area, that a person is missing, or that there. What is a code gray in a hospital? Speeli from www.speeli.com Code black typically means there is a bomb. Code red indicates fire or smoke in the hospital. A code gray is a hospital emergency in which the patient's condition is unknown or uncertain.