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 0C5XX
Destruction of Lower Tooth, Single, External Approach
Destruction of Lower Tooth, Single, Open Approach
Destruction of Lower Tooth, All, External Approach
Destruction of Lower Tooth, Multiple, External Approach
Destruction of Lower Tooth, All, Open Approach
Destruction of Lower Tooth, Multiple, Open Approach