Hmmm, cheat codes... I´ve never heard of any! The cheats in the game originates froms smaller "bugs" such as the endless gold trick. If you feel you need more hitpoints I´d suggest letting all your characters become barbarians. I usually do that with all my chars, for instance wizard(stone)-->bard(moon)-->barbarian-->samurai(sun)-->warlock(fiend). This one´s my favourite since you get awesome weapon-, magic- and miscellanous skills! And btw, welcome to the board!
A dancing mummy just for you, lol...