Medicare covers screening colonoscopies once every 24 months if you’re at high risk for colorectal cancer. If you aren’t at high risk, Medicare covers the test once every 120 months, or 48 months after a previous flexible sigmoidoscopy. There’s no minimum age requirement.
If your doctor or other qualified health care provider accepts assignment , you pay nothing for this test. However, if your doctor finds and removes a polyp or other tissue during the colonoscopy, you may pay 20% of the Medicare-Approved Amount of your doctor’s services and a separate facility copayment in a hospital outpatient setting. The Part B deductible doesn't apply.