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 09C1X
Extirpation of Matter from L Ext Ear, Perc Endo Approach
Extirpation of Matter from Left External Ear, Perc Approach
Extirpation of Matter from L Ext Ear, Extern Approach
Extirpation of Matter from Left External Ear, Open Approach