Doc's Code (医術の心得, Ijutsu no Kokoroe?, lit. Medicinal Knowledge), also known as Doctor's Code, is a recurring item in the series, either appearing as an item or accessory. It generally increases the potency of items, similar to the ability Item Lore.
Doc's Code is an item that teaches any GF the ability Med Data. It can be obtained by refining 10 Elixirs into one Doc's Code or one Leviathan card into 3 Doc's Codes. One Doc's Code can be refined into one Megalixir via Forbid Med-RF.