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 0KN1X
Release Facial Muscle, Open Approach
Release Facial Muscle, Percutaneous Approach
Release Facial Muscle, Percutaneous Endoscopic Approach
Release Facial Muscle, External Approach