Code Blue is a security status used by the Space Pirates. It was mentioned on the Pirate Data entry "Fall of Zebes", located on the Frigate Orpheon in Metroid Prime. Code Blue is enforced when no signs of pursuit from Samus Aran are shown.

Later in the game, a scan in the Phendrana Drifts Map Station says that "East Quarantine Cave is restricted to Blue-level security. Authorized personnel permitted entry only after bio-scan."