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 0KNGX
Release Left Trunk Muscle, External Approach
Release Left Trunk Muscle, Open Approach
Release Left Trunk Muscle, Percutaneous Approach
Release Left Trunk Muscle, Percutaneous Endoscopic Approach