Here are a sampling of the ones we have:
Code 8 (the regular code blue in most places but like Braden said named after a number so as not to scare the patients)
Code Mr. Green (severely agitated patient or visitor)
Code PCI (primary angioplasty)
Code Adam (lost or kidnapped pedi patient)
Code Orange (I think this is a bomb threat)
Code 123 Red (fire)
I think that's it for the actual "codes". Now to move on to the initials:
MET called overheard along with the floor and room # means medical emergency team or rapid response team in some places
BAT called again along with the floor means the acute stroke team
Ok I think that's it on the alpha-numeric soup!!
I checked the back of my badge after I got to work and not surprisingly I got a few of these wrong!! The bomb threat is actually a Code Grey. And I skipped one: Code 911 (nope not the one where a patient is actually coding!!) which is an external disaster during which the phone tree should be activated to get as much staff as possible in the building. This would be something like a major accident or chemical spill involving mass casualties etc.