Question: Answer: For the E/M, you should bill 99212 (Office or other outpatient visit for the evaluation and management of an established patient which requires at least 2 of these 3 key components: a problem focused history; a problem focused examination, and straightforward medical decision making; Significant, separately identifiable evaluation and management service by the same physician on the same day of the procedure or other service). Straightforward medical decision making (MDM), with an expanded problem focused history/exam and a problem focused history/exam makes the MDM the driving factor in meeting an established patient's 2 of 3 key components' requirement for 99212.