I would echo David's comment regarding an average followup visit being a 99214. It's been hard for me to change my ways considering a 99213 an average visit, but if you actually study the coding guidelines, 99214 is your average followup visit if the patient has any complexity at all. This is a huge difference on an annual basis.
If you want to learn more about coding I would suggest
http://www.codinggrowthstrategies.com/This guy probably "pushes it" but I learned some good tips.
Disclosure: I have no financial ties to this website.
