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 0KJXX
Inspection of Upper Muscle, Open Approach
Inspection of Upper Muscle, Percutaneous Endoscopic Approach
Inspection of Upper Muscle, Percutaneous Approach
Inspection of Upper Muscle, External Approach