Having a lot of appointment types actually increases total delay in the system because each appointment type creates its own differential delay and queue. For example, if a physician only takes physicals on Tuesday afternoons, a patient needing a physical may have to wait several weeks until a Tuesday afternoon slot is available. In addition, each appointment type creates its own inclusion and exclusion criteria (who gets in and who doesn't). The more criteria, the more time it takes to put people in the line.