Question: Nevada Subscriber Answer: If a tube change has been done as a separate procedure in the operating room under general anesthesia in a patient with an established fistula tract, then the procedure can be reported using 31899 (Unlisted procedure, trachea, bronchi). However, in most circumstances, a tracheostomy tube change is considered a part of the E/M and is just billed as a component of the E/M that is being reported for the visit. But, under some appropriately documented circumstances, the change of a tracheostomy tube may change the level of the E/M to a higher level due to the increase in the level of decision making from your pulmonologist. If your pulmonologist goes in for a tracheostomy tube change in the 90-day global period of an unrelated procedure that he (or a same-specialty group member) also performed, then a separate E/M can be billed. However, you have to add a modifier 24 (Unrelated evaluation and management service by the same physician during a postoperative period) to the E/M to make it known that it is an evaluation and management for an unrelated issue.