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 0CC0X
Extirpation of Matter from Upper Lip, Percutaneous Approach
Extirpation of Matter from Upper Lip, External Approach
Extirpation of Matter from Upper Lip, Open Approach