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 0SQ4X
Repair Lumbosacral Disc, Percutaneous Endoscopic Approach
Repair Lumbosacral Disc, Percutaneous Approach
Repair Lumbosacral Disc, Open Approach
Repair Lumbosacral Disc, External Approach