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 0QQ0X
Repair Lumbar Vertebra, Open Approach
Repair Lumbar Vertebra, External Approach
Repair Lumbar Vertebra, Percutaneous Approach
Repair Lumbar Vertebra, Percutaneous Endoscopic Approach