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 09U1X
Supplement Left External Ear with Synth Sub, Extern Approach
Supplement Left External Ear with Nonaut Sub, Open Approach
Supplement Left External Ear with Autol Sub, Open Approach
Supplement L Ext Ear with Nonaut Sub, Extern Approach
Supplement Left External Ear with Synth Sub, Open Approach
Supplement Left External Ear with Autol Sub, Extern Approach