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 0CC5X
Extirpation of Matter from Upper Gingiva, Open Approach
Extirpation of Matter from Upper Gingiva, Perc Approach
Extirpation of Matter from Upper Gingiva, External Approach