Ask Dr. Z

In an earlier question, you recommended using code 37242 for embolization of the GDA or right hepatic if performed at a separate session to prevent errant embolization with particles into normal structures during the Y90 embolization a week or two later - rather than 37243. What embolization code should be used for a patient who has bleeding, but the source of the bleed cannot be found, and so vessel(s) are embolized prophylactically - 37244 or 37242?