Under audit for GI. I am having trouble determining when the indexed anastomosis code 569.49 is to be used, and when to use the V45.3. Colonscopy op reports states that procedure was performed to the anastomosis, but does not state where the anastomosis is within the colon, nor does it state if anastomosis is a new condition or old. I have been using the indexed anastomosis code of 569.49, but getting it wrong, stating I need to use the V45.3. So, when do you use the 569.49 code?