Ask Dr. Z

According to your reference and previously asked questions, codes 47805 and 74305 are reported for a cholecystostomy tube check. I'm coding for a "follow-up of post gallbladder drainage" in which "scans are obtained through upper abdomen without contrast and after injection of the drainage catheter. After injection there is filling of the gallbladder." The impression was "after injection of contrast through the drain there is a small amount of leakage into the pericholecystic region." So I am told by the IR coder that in this case code 74150 should be used. However, could code 47505 also be used for the injection into the catheter? Or is code 47505 only to be used for a specific check of the tube functioning?