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 0SQ3X
Repair Lumbosacral Joint, Percutaneous Endoscopic Approach
Repair Lumbosacral Joint, Open Approach
Repair Lumbosacral Joint, External Approach
Repair Lumbosacral Joint, Percutaneous Approach