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 09C4X
Extirpate of Matter from L Ext Auditory Canal, Open Approach
Extirpate of Matter from L Ext Auditory Canal, Perc Approach
Extirpate matter from L Ext Auditory Canal, Extern
Extirpation of Matter from L Ext Auditory Canal, Via Opening
Extirpate matter from L Ext Auditory Canal, Perc Endo
Extirpation of Matter from L Ext Auditory Canal, Endo