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 0CCPX
Extirpation of Matter from Tonsils, Open Approach
Extirpation of Matter from Tonsils, External Approach
Extirpation of Matter from Tonsils, Percutaneous Approach