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 0RJ9X
Inspection of Thoracic Vertebral Disc, External Approach
Inspection of Thoracic Vertebral Disc, Open Approach
Inspection of Thoracic Vertebral Disc, Percutaneous Approach
Inspection of Thoracic Vertebral Disc, Perc Endo Approach