. >> reporter: congressman daniel payne jr. has been trying to fix the issues. his father died of colon cancer in 2012. >> unfortunately my father would not get checked. and subsequently succumbed to the disease. there's no reason he shouldn't be here now other than he wasn't screened. >> reporter: payne sponsored legislation to close the billing loophole for medicare patients so if polyps are removed, that part of the colonoscopy will also be paid for. >> people should not have to be worried when they go to sleep for a procedure, what the bill is going to be on the other side. >> reporter: bill passed congress last week but doesn't apply to private insurance patients, many of whom told us they received bills for colonoscopies they thought were covered. despite fact that department of health and human services said it should be covered even if polyps are removed. is this the way you wanted it to work? >> no. that patient who goes into office for screening colonoscopy should not have to pay anything when they wake up. >> reporter: university of michigan, helped w