Abstract: A method of expediting medical diagnosis code selection by executing computer-executable instructions stored on a non-transitory computer-readable medium provides a means for healthcare providers to quickly and efficiently select appropriate medical diagnosis codes by providing electronic cheat sheets within a computer program environment. An electronic cheat sheet, or customized reference sheet, contains elements that function as pointers to elements in a database of medical diagnosis codes which has a branching hierarchal structure and can be graphically navigated.