Sorry, didn't mean to imply you hadn't searched first, it's just that I thought I'd recalled this bilateral vs. unilateral discussion coming up a number of times in the past. Well, to answer your question, since the procedure involves both bladder and ureters, I wouldn't agree that is correct to say that it is one or the other, but I'll defer to the sources cited. Regarding the use of the LT/RT modifier, in my opinion and based on my own experience with payers, these modifiers are informational and don't affect payment other than to distinguish the procedure from others that might have been billed on the contralateral side. So I don't see anything wrong with adding it and since there is a ureteral component it seems self-evident what the modifier would signify. However, from the forum discussion I have noticed that a lot of coders seem to have had different experience than I have, in that some payers appear to be more strict about the use of these modifiers and may or may not allow or require them. But the bottom line is that it shouldn't really matter - as the AUA points out, the RVUs for this code have been set to account for the fact that the procedure is sometimes performed on one side and sometimes on both, so it should not be necessary to indicate this unless the a payer is requiring it for some other reason. Hope that helps some.