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 0CH7X
Insertion of Radioactive Element into Tongue, Perc Approach
Insertion of Radioact Elem into Tongue, Extern Approach
Insertion of Radioactive Element into Tongue, Open Approach