If you are getting a colonoscopy sooner than 10 years, even if it is just for preventative reasons such as personal or family history of colon cancer, your insurance company may not cover the full amount of your procedure and might put some, or all, of the procedure cost towards your deductible. If you have Medicare and have a screening colonoscopy, but we find a polyp (a small clump of cells that may or may not be cancerous) or take a biopsy during the procedure, Medicare considers the procedure to be diagnostic and will cover everything except for 20% of the procedure cost, which will then go towards your deductible.