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 0WC3X
Extirpation of Matter from Oral Cav & Throat, Perc Approach
Extirpate of Matter from Oral Cav & Throat, Extern Approach
Extirpate matter from Oral Cav & Throat, Perc Endo
Extirpation of Matter from Oral Cav & Throat, Open Approach