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 0WJ4X
Inspection of Upper Jaw, External Approach
Inspection of Upper Jaw, Percutaneous Approach
Inspection of Upper Jaw, Open Approach
Inspection of Upper Jaw, Percutaneous Endoscopic Approach