Medicare covers colonoscopy at no cost to you when it is used for screening, and covers most of the cost when polyps or other problems are found and treated during the procedure.
If your doctor orders a screening colonoscopy and you have Part B, Medicare pays for the entire procedure — you pay nothing, not even your deductible. If the doctor finds and removes polyps or treats a condition during that same visit, you still pay nothing for the colonoscopy itself, though you may owe a copay or coinsurance for any biopsies or additional treatment. The coverage applies once every 10 years for people at average risk, or more often if your doctor documents that you have a higher risk.
The key distinction is between screening (looking for problems when you have no symptoms) and diagnostic (investigating symptoms or abnormal results). Medicare treats these differently, and the difference affects what you pay.
Key Takeaways
- Screening colonoscopy is fully covered by Medicare Part B with no deductible or copay, once every 10 years for people at average risk.
- If polyps are found and removed during a screening colonoscopy, you still pay nothing for the procedure itself.
- A diagnostic colonoscopy — ordered because of symptoms or abnormal test results — requires you to pay your Part B deductible and 20 percent coinsurance after that.
- You must use a doctor or facility that accepts Medicare assignment, or you may owe more than the standard cost-sharing amounts.
- Tell your doctor before the procedure whether it is being ordered for screening or for a specific symptom, because this determines your out-of-pocket cost.
How Medicare Defines Screening vs. Diagnostic Colonoscopy
A screening colonoscopy is performed on someone with no symptoms, no family history of colorectal cancer, and no prior abnormal results. Medicare covers this once every 10 years at no cost to you. If your doctor finds polyps during a screening colonoscopy and removes them, Medicare still covers the entire procedure as screening — you pay nothing.
A diagnostic colonoscopy is ordered because you have symptoms (blood in stool, abdominal pain, changes in bowel habits), a family history of colorectal cancer, or an abnormal result from a prior screening test like a stool test or CT scan. For a diagnostic colonoscopy, you pay your Part B deductible (currently $240 per year) plus 20 percent of the Medicare-approved cost for the procedure itself. You also pay 20 percent coinsurance for any biopsies or polyp removal.
The distinction matters because it changes your cost from zero to potentially several hundred dollars. Before your procedure, confirm with your doctor's office whether Medicare will classify it as screening or diagnostic — this depends on your medical history and the reason your doctor ordered it.
What You Pay for a Screening Colonoscopy
If Medicare covers your colonoscopy as a screening procedure, you pay nothing. This includes the doctor's fee, the facility fee, and the cost of anesthesia. You do not pay your deductible. You do not pay a copay. Medicare pays the provider directly at the Medicare-approved rate, and that is the end of your financial obligation for the procedure itself.
The only exception is if the doctor discovers something during the screening that requires additional treatment — for example, a large polyp that needs to be sent to a lab for analysis, or a biopsy of an abnormal area. In those cases, you may owe 20 percent coinsurance for the biopsy or additional procedure, but not for the colonoscopy screening itself.
If you have a Medigap or Medicare Advantage plan, your supplemental coverage may also cover some or all of the coinsurance for biopsies or treatment. Check your plan documents or call your plan to confirm.
What You Pay for a Diagnostic Colonoscopy
If your colonoscopy is classified as diagnostic, you are responsible for your Part B deductible ($240 in 2024, though this amount changes yearly) if you have not met it yet that year. After your deductible is met, you pay 20 percent of the Medicare-approved cost for the procedure. For a diagnostic colonoscopy, the total out-of-pocket cost typically ranges from $300 to $600 depending on your deductible status and the complexity of the procedure, but this varies by region and facility.
If the doctor performs a biopsy or removes a polyp during a diagnostic colonoscopy, you also pay 20 percent coinsurance for those services. If you have a Medigap plan, it may cover your deductible and coinsurance. If you have a Medicare Advantage plan, your cost-sharing depends on your specific plan — some Advantage plans cover diagnostic colonoscopy with no copay, while others charge a copay similar to an office visit.
How to Confirm Your Coverage Before the Procedure
Call your doctor's office at least one week before your scheduled colonoscopy and ask them to confirm with Medicare whether the procedure will be classified as screening or diagnostic. Provide them with your Medicare number. The office staff can contact Medicare or check their billing system to verify the classification and tell you what you will owe.
Also confirm that your doctor and the facility where the procedure will take place both accept Medicare assignment. This means they agree to accept the Medicare-approved amount as payment in full. If they do not accept assignment, you may owe more than the standard cost-sharing amounts. You can verify this by calling your doctor's office or by searching the Medicare provider directory at Medicare.gov.
If you have a Medigap or Medicare Advantage plan, call that plan's customer service line and tell them the procedure is scheduled. They can tell you whether your plan covers any additional costs beyond what Original Medicare covers.
Age and Risk Factors That Affect Coverage
Medicare covers screening colonoscopy once every 10 years for people age 50 and older who are at average risk for colorectal cancer. If you are younger than 50, Medicare does not cover screening colonoscopy unless you have a family history of colorectal cancer or other risk factors — in that case, your doctor can order it as a diagnostic procedure, and you would pay the diagnostic cost-sharing amounts.
If you have a personal or family history of colorectal cancer, polyps, or inflammatory bowel disease, your doctor may recommend colonoscopy more often than every 10 years. Medicare will cover these more frequent procedures as screening (at no cost to you) if your doctor documents the medical reason. The documentation in your medical record is what Medicare uses to determine coverage, not your word or your doctor's verbal statement.
If you have never had a colonoscopy and are 50 or older, you are covered for one screening colonoscopy. If you have had a prior colonoscopy, Medicare tracks the date and will cover the next one 10 years later, or sooner if your doctor documents a medical reason.
What Happens if You Have a Medicare Advantage Plan
Medicare Advantage plans must cover screening colonoscopy at no cost to you, just as Original Medicare does. However, the facility or doctor you use must be in your plan's network. If you go out of network, you may owe more or the procedure may not be covered at all.
For diagnostic colonoscopy, your Advantage plan's cost-sharing may differ from Original Medicare. Some plans charge a copay (for example, $150 for a specialist procedure), while others charge coinsurance. Check your plan's summary of benefits or call customer service before your procedure to find out what you will owe.
If you are switching between Original Medicare and a Medicare Advantage plan, or if you recently enrolled in Medicare, tell your doctor's office which coverage you have so they bill the correct plan.
Frequently Asked Questions
Do I have to pay anything out of pocket for a screening colonoscopy?
No. If Medicare classifies your colonoscopy as screening, you pay nothing — not your deductible, not a copay, not coinsurance. Medicare covers the full cost. The only exception is if the doctor performs a biopsy or additional treatment during the procedure, in which case you may owe 20 percent coinsurance for that specific service.
How do I know if my colonoscopy will be screening or diagnostic?
Call your doctor's office before the procedure and ask them to confirm the classification with Medicare. Your medical history — whether you have symptoms, prior abnormal results, or risk factors — determines the classification. The office can check this in their billing system or by contacting Medicare directly.
What if I have both Original Medicare and a Medigap plan?
Your Medigap plan covers your deductible and coinsurance for a diagnostic colonoscopy, so you typically pay nothing out of pocket. For a screening colonoscopy, you pay nothing with either plan. Call your Medigap plan to confirm, as coverage varies by plan type.
Can I get a colonoscopy more often than every 10 years and still have it covered as screening?
Yes, if your doctor documents a medical reason — such as a family history of colorectal cancer, a prior polyp, or inflammatory bowel disease. Medicare will cover more frequent colonoscopies as screening (at no cost to you) when your doctor's notes support the medical necessity.
What if my doctor's office is out of network for my Medicare Advantage plan?
You may owe more than the standard cost-sharing amount, or the procedure may not be covered at all. Before scheduling, confirm with your Advantage plan that both your doctor and the facility are in network. If they are not, ask your plan whether you can get an out-of-network referral or whether you should find an in-network provider.