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 0XJ5X
Inspection of Left Axilla, Open Approach
Inspection of Left Axilla, Percutaneous Endoscopic Approach
Inspection of Left Axilla, External Approach
Inspection of Left Axilla, Percutaneous Approach