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 0PQ4X
Repair Thoracic Vertebra, Open Approach
Repair Thoracic Vertebra, Percutaneous Endoscopic Approach
Repair Thoracic Vertebra, External Approach
Repair Thoracic Vertebra, Percutaneous Approach