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 0LNDX
Release Left Thorax Tendon, Open Approach
Release Left Thorax Tendon, Percutaneous Approach
Release Left Thorax Tendon, External Approach
Release Left Thorax Tendon, Percutaneous Endoscopic Approach