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 09TC0
Resection of Left Mastoid Sinus, Endo
Resection of Left Mastoid Sinus, Perc Endo Approach
Resection of Left Mastoid Sinus, Open Approach