Wiki Colonoscopy Screening turned Sigmoidoscopy

[mikaylalynn9127]

I just have a question on the modifier usage. A normal colonoscopy screening would get a 33 mod, but when the scope only advances to the sigmoid, we would bill a sigmoidoscopy. Do you all still append modifier 33 or are you removing it and leaving the Z12.11 diagnosis to give the hint to payors that it was meant to be a screening? I feel like I've done it both ways unintentionally and would like to make sure I am billing out correctly.

Thank you for your help!