Ask Dr. Z

When performing a duplex scan of arterial inflow and venous outflow for preoperative vessel assessment prior to creation of hemodialysis access (93985/93986), if you were to perform a duplex scan on the entire radial and ulnar artery as well as the palmar arch, would you be able to bill for the additional studies (e.g.,  93930/ 93931)?

In know code 93930 is a column 2 code for 93985, but you may use an NCCI-associated modifier to override the edit under appropriate circumstances, so I just wanted to check whether the use of a modifier would be appropriate.