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 08R7X
Replacement of Left Sclera with Autol Sub, Extern Approach
Replacement of Left Sclera with Nonaut Sub, Extern Approach
Replacement of Left Sclera with Synth Sub, Extern Approach