Wiki Coding Help - I have coded a cysto w/right double-J

[willoughbyclan]

I have coded a cysto w/right double-J stent exchange (removal and replacement) as 52332 with no modifier. However, a Humana Medicare replacement plan has denied with code 4 (procedure is inconsistent with modifier used or a required modifier is missing) and code N657 (This should be billed with the appropriate code for these services).

Any ideas or help?

Thanks in advance.