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 0SJ8X
Inspection of Left Sacroiliac Joint, Percutaneous Approach
Inspection of Left Sacroiliac Joint, Open Approach
Inspection of Left Sacroiliac Joint, External Approach
Inspection of Left Sacroiliac Joint, Perc Endo Approach