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 0PQSX
Repair Left Thumb Phalanx, Percutaneous Approach
Repair Left Thumb Phalanx, Percutaneous Endoscopic Approach
Repair Left Thumb Phalanx, Open Approach
Repair Left Thumb Phalanx, External Approach