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 0LNBX
Release Left Trunk Tendon, Percutaneous Approach
Release Left Trunk Tendon, External Approach
Release Left Trunk Tendon, Percutaneous Endoscopic Approach
Release Left Trunk Tendon, Open Approach