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 0C90X
Drainage of Upper Lip, External Approach, Diagnostic
Drainage of Upper Lip, Percutaneous Approach
Drainage of Upper Lip with Drainage Device, Perc Approach
Drainage of Upper Lip, Percutaneous Approach, Diagnostic
Drainage of Upper Lip, Open Approach, Diagnostic
Drainage of Upper Lip with Drainage Device, Open Approach
Drainage of Upper Lip, External Approach
Drainage of Upper Lip, Open Approach
Drainage of Upper Lip with Drainage Device, Extern Approach