I need some clarification on the proper billing of CPT 61154 - Burr hole(s) with evacuation and/or drainage of hematoma, extradural or subdural. Based on the description it appears that this one code covers one or more burr holes. Yet it says for bilateral to use the 50 modifier. I had a case where there was a burr hole created in the frontal and parietal occipital. The code was billed twice and Medicare paid. I have been told that this code should only be billed once. I am confused. Any insight into the proper billing of this code is greatly appreciated. Also does anyone know of any neurosurgery classes out there?