The Approach Open is identified by number "0" and occupies the 5th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to 09TT0
Resection of Left Frontal Sinus, Endo
Resection of Left Frontal Sinus, Perc Endo Approach
Resection of Left Frontal Sinus, Open Approach