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 0KNDX
Release Left Hand Muscle, External Approach
Release Left Hand Muscle, Percutaneous Endoscopic Approach
Release Left Hand Muscle, Open Approach
Release Left Hand Muscle, Percutaneous Approach