Adenomatous polyp usually is indicated in the pathology report. If the pathology is ready at the time of coding, I would like to code it instead of polyp. If not, code it as K63.5. When patient was for screening colonoscopy but also had polypectomy at the same encounter. The final diagnoses should be Z12.11 ( as primary), secondary is whatever the finding + history code if indicated. CPT from screening colonoscopy changed to whatever diagnostic procedure was done with modifier " PT" for medicare or " 33" for Commerical insurances to indicated that patient was originally encountered for screening colonoscopy, but turned out diagnostic procedure.