Which of the following statements best explains the need for an appended modifier in this case?

a. A separately identifiable E/M service was performed by the same physician on the same day as the other procedure or service
b. An unrelated E/M service was performed by the same physician during the postoperative period
c. An E/M service has been mandated by an outside agency
d. A decision for surgery has been made by the physician performing the E/M service

b) An unrelated E/M service was performed by the same physician during the postoperative period