The Body Part Atrial Septum is identified by number "5" and occupies the 4th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to 0255
Destruction of Atrial Septum, Open Approach
Destruction of Atrial Septum, Percutaneous Approach
Destruction of Atrial Septum, Perc Endo Approach