I'm not all that good at this so I thought I should ask before making the decision. Patient has a dual ICD. Doctor wants to do a revision of the RV lead. I see a couple codes I can choose from. 33218 is repair of a single lead but that's for a single chamber. 33220 is repair of two leads for a dual chamber. But if he's only going to revise 1 lead, what do I look at??