Some common codes-At least from one NY Hospital.

Code Blue: crashing patient, send in the code team (respiratory therapist, MD, critical care nurses, IV Team nurse) for resuscitation
Code P: pediatric code blue
Code C: hospital at capacity, means overflow patients, if you have a 44 bed unit, you'll put people in the halls to have a suddenly 48 or 50 bed unit. The ER will hold patients as admits (called ERAs, emergency room admits)
Code Pink: Missing baby or kid. Hospital goes on lock down
Code Red: Fire. Code Red D: fire drill
Calling Dr Strong to Room XXXX: Uncontrollable patient, security and big people go in to handle it, lol.
Code Yellow: Chemical spill
Code D: disaster
Code DC: hospital is on disaster alert, to recieve patients involved in a disaster
Go-To: pre code. patient isn't coding yet, but might, so send in the code team before you have to code them.