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 0CC1X
Extirpation of Matter from Lower Lip, Open Approach
Extirpation of Matter from Lower Lip, Percutaneous Approach
Extirpation of Matter from Lower Lip, External Approach