I bill the both colonoscopy through the stoma (in the small intestine and stomal cpt section) - a 44388, for example - AND bill a colonoscopy or flexible sigmoidoscopy through the rectum (a 45378 or 45330, for example) - together with a -59 modifier on the lowest RVU procedure, because they're separate procedures.
You will need to know how far/to what anatomical point the physician inserts the scope through the rectum.....up to 60cm or 70cm, it's considered a flexible sigmoidoscopy.... beyond 60cm or 70cm - past the splenic flexure, it's considered a colonoscopy.
If denied, appeal with operative notes. The colon was divided into 2 parts and the physician did BOTH procedures - and should get reimbursed for both.
Hope this helps.
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