Help! I need to educate a group of providers (general medicine, gynecology and neurology) on the "rules" governing billing for injections with an E/M. I am looking for documentation that details WHEN to bill the injection code and WHEN NOT to bill the injection code. For example, if a patient presents for an est visit and receives an injection for b12 deficiency using his/her OWN medication. I need a "brush up" on the guidelines governing what is inclusive of a visit and what constitutes billing the E/M with a 25...etc. Any help is greatly appreciated!