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 3E1CX
Irrigation of Eye using Irrigating Substance, Perc Approach
Irrigation of Eye using Irrigat, Perc Approach, Diagn
Irrigation of Eye using Irrigating Substance, Diagnostic
Irrigation of Eye using Irrigating Substance