Medicare Covers Colonoscopy for Screening at No Cost to You
Yes, Medicare Part B covers colonoscopy as a screening test for colorectal cancer. If your doctor orders the procedure for screening purposes — meaning you have no symptoms and no prior diagnosis of colorectal cancer — you pay nothing. Medicare pays the full cost, including the facility fee, the doctor's fee, and anesthesia.
The catch is timing. Medicare covers screening colonoscopy once every 10 years if the results are normal, or more often if your doctor finds polyps or other abnormalities. If you have had a colonoscopy within the past 10 years and the results were normal, a new screening colonoscopy will not be covered as a preventive service — though your doctor can still order one and you would pay out-of-pocket or under a different coverage rule.
If your colonoscopy is diagnostic — meaning your doctor ordered it because you have symptoms like bleeding, abdominal pain, or a change in bowel habits — Medicare covers it differently. You will owe your Part B deductible (currently $240 per year) and 20 percent of the cost after that. The distinction between screening and diagnostic matters, so confirm with your doctor's office which category your procedure falls into before the appointment.
Key Takeaways
- Screening colonoscopy (no symptoms, normal prior results) is covered at 100 percent with no out-of-pocket cost under Medicare Part B.
- You are covered for screening colonoscopy once every 10 years if results were normal, or sooner if polyps or abnormalities were found.
- Diagnostic colonoscopy (ordered because of symptoms) requires you to pay your Part B deductible plus 20 percent coinsurance.
- If polyps are removed during a screening colonoscopy, you may owe coinsurance because the procedure becomes therapeutic, not purely preventive.
- Confirm with your doctor's office whether your procedure is coded as screening or diagnostic before your appointment.
What Happens If Polyps Are Found and Removed
If your colonoscopy starts as a screening procedure but your doctor finds and removes polyps, the billing changes. The screening portion remains covered at 100 percent, but the removal of polyps is considered treatment. You will owe your Part B deductible and 20 percent coinsurance on the polyp removal portion of the bill.
This is one of the most common surprises in colonoscopy billing. A patient arrives expecting free screening and leaves with a bill for several hundred dollars. The amount depends on how many polyps were removed, whether they required advanced removal techniques, and whether biopsies were taken. Ask your doctor before the procedure what the likely out-of-pocket cost will be if polyps are found.
Medicare Part B Deductible and Coinsurance Explained
For any colonoscopy that is not purely preventive screening, you are responsible for two costs: the deductible and coinsurance.
The Part B deductible is a fixed amount you pay once per calendar year before Medicare starts paying its share. For 2024, this is $240. Once you have paid $240 toward Medicare Part B services in a year, your deductible is met for the rest of that year. If you have already met your deductible earlier in the year (for example, through an office visit or lab work), you will not owe it again for your colonoscopy.
Coinsurance is 20 percent of the Medicare-approved amount for the service. If the approved amount is $1,000, you owe 20 percent of that ($200) after your deductible is met. Medicare pays the remaining 80 percent. The actual bill from the facility may be higher than the Medicare-approved amount, but you are only responsible for 20 percent of what Medicare approves — the facility must write off the rest.
If you have a Medigap or Medicare Advantage plan, that plan may cover some or all of your deductible and coinsurance. Check your plan documents or call your plan's customer service line to confirm what you will owe.
How to Confirm Coverage Before Your Appointment
Contact your doctor's office at least one week before your scheduled colonoscopy and ask them to confirm the procedure code with Medicare. The code determines whether Medicare treats it as screening (covered at 100 percent) or diagnostic (subject to deductible and coinsurance). Your doctor's office can call Medicare or check online to verify.
You can also call Medicare directly at 1-800-MEDICARE (1-800-633-4227) and provide your Medicare number and the date of your procedure. Have your doctor's name and the facility name ready. Medicare can tell you what your out-of-pocket responsibility will be based on your specific coverage.
If you have a Medigap or Medicare Advantage plan, call that plan's customer service number — it is on your insurance card — and ask what you will owe for a colonoscopy at your chosen facility. Some plans cover the full deductible and coinsurance; others cover part of it. Knowing this in advance prevents billing surprises.
Colonoscopy at an Outpatient Surgery Center Versus a Hospital
Where your colonoscopy takes place affects the facility fee, which is part of your total cost. Outpatient surgery centers and hospital outpatient departments both perform colonoscopies, but they bill differently.
At an outpatient surgery center, the facility fee is usually lower, and Medicare's approved amount is smaller. Your 20 percent coinsurance will be lower as a result. At a hospital outpatient department, the facility fee is typically higher, and so is your potential coinsurance.
If you have a choice, ask your doctor whether the procedure can be done at an outpatient surgery center instead of a hospital. The medical outcome is the same, but your out-of-pocket cost may be noticeably lower. Some insurance plans also have different cost-sharing rules for hospital versus surgery center procedures, so check your plan documents.
What to Do If You Receive an Unexpected Bill
If you receive a bill that seems wrong — for example, you were told screening colonoscopy is free but you received a bill for coinsurance — do not ignore it. Contact the facility's billing department and ask them to explain the procedure code used. Request an itemized bill that shows what was done and how each service was coded.
If the facility coded a screening colonoscopy as diagnostic without a clear reason, ask them to resubmit the claim to Medicare with the correct code. If they refuse or if you believe the coding is wrong, you can file a complaint with Medicare. Call 1-800-MEDICARE and ask how to report billing issues, or visit Medicare.gov and search for "file a complaint."
Keep all paperwork: your appointment confirmation, the bill, the explanation of benefits from Medicare, and any correspondence with the facility. If you have a Medigap or Medicare Advantage plan, also contact that plan's customer service to report the issue — they may help you dispute the bill.
Age and Frequency Rules for Screening Colonoscopy
Medicare covers screening colonoscopy starting at age 50 for people at average risk of colorectal cancer. If you are younger than 50, Medicare will not cover screening colonoscopy unless you have symptoms or a family history that your doctor documents.
The frequency depends on your prior results. If your last colonoscopy was normal, Medicare covers the next screening colonoscopy 10 years later. If polyps were found and removed, your doctor will recommend a follow-up colonoscopy sooner — typically in 3, 5, or 10 years depending on the type and number of polyps. Medicare will cover that sooner follow-up as a screening procedure if your doctor orders it based on your prior results.
If you have a family history of colorectal cancer or a personal history of inflammatory bowel disease, your doctor may recommend more frequent screening. Medicare will cover these more frequent procedures if your doctor documents the medical reason.
Frequently Asked Questions
Do I have to pay anything if my colonoscopy is normal and no polyps are found?
No. If your colonoscopy is coded as screening and no polyps or abnormalities are found, Medicare covers 100 percent of the cost. You pay nothing — no deductible, no coinsurance, no facility fee.
What if I have a Medicare Advantage plan instead of Original Medicare?
Medicare Advantage plans must cover screening colonoscopy at no cost, just like Original Medicare. However, they may have different rules about which facilities you can use and may require prior authorization. Call your plan before scheduling to confirm the procedure is covered and whether you need approval first.
Can I get a colonoscopy more often than every 10 years if I want to?
Yes, but Medicare will not cover it as a screening procedure. If you want a colonoscopy sooner than your doctor recommends, you can have one, but you will pay out-of-pocket or it will be coded as diagnostic and subject to your deductible and coinsurance. Talk to your doctor about whether more frequent screening is medically necessary for you.
What if my doctor finds cancer during the colonoscopy?
If cancer is found, the colonoscopy is no longer a screening procedure — it becomes diagnostic and therapeutic. Medicare covers the procedure, but you will owe your Part B deductible and 20 percent coinsurance. Any follow-up treatment (surgery, chemotherapy, radiation) is covered under your Medicare plan's rules for cancer treatment.
Do I need to pay for the prep kit or the anesthesia separately?
No. For a covered screening colonoscopy, Medicare includes the cost of anesthesia and sedation in the procedure. The facility provides the prep solution or kit, and that cost is included in the facility fee that Medicare covers. You do not receive a separate bill for these items.