The Approach External is identified by letter "X" and occupies the 5th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to 0B21X
Change Endotracheal Airway in Trachea, External Approach
Change Tracheostomy Device in Trachea, External Approach
Change Other Device in Trachea, External Approach
Change Drainage Device in Trachea, External Approach