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 08R6X
Replacement of Right Sclera with Autol Sub, Extern Approach
Replacement of Right Sclera with Synth Sub, Extern Approach
Replacement of Right Sclera with Nonaut Sub, Extern Approach