Sega Sports NBA 2K3 Cheat Codes for Playstation 2

Unlock Bonus Teams
Enter the options menu and select "Gameplay". Hold D-pad Left + Left Analog-stick Right and press Start. The "Codes" selection will now be unlocked at the options menu.
Enter MEGASTARS as a case-sensitive code to unlock the Sega Sports, Visual Concepts, and Team 2K2 in exhibition and street modes.