Medicare covers colonoscopy at no cost to you when it's used for screening, and pays most of the cost when polyps or other problems are found and treated during the procedure

If you have Original Medicare (Part A and Part B), colonoscopy for cancer screening is covered with zero out-of-pocket cost — no copay, coinsurance, or deductible. This applies once every 10 years if the results are normal, or more often if your doctor finds polyps or other abnormalities. Medicare pays the full approved amount to the facility and the doctor.

The coverage changes if your doctor removes a polyp, takes a biopsy, or treats something else during the same visit. In that case, the procedure shifts from "screening" to "diagnostic," and you may owe coinsurance (typically 20 percent of the Medicare-approved amount) after you've met your Part B deductible for the year. The facility itself is covered under Part A, so there's no separate facility fee.

If you have a Medicare Advantage plan (Part C), your coverage depends on your specific plan. Most plans cover screening colonoscopy with no cost, but diagnostic colonoscopy may have a copay or coinsurance. Check your plan documents or call the plan directly to confirm what you'll owe.

Key Takeaways

  • Original Medicare covers screening colonoscopy with no cost to you when performed for cancer prevention on a normal schedule.
  • If a polyp is removed or a biopsy is taken during the same visit, you may owe 20 percent coinsurance after meeting your Part B deductible.
  • Medicare Advantage plans vary in their colonoscopy coverage, so you should contact your plan before the procedure to learn your exact costs.
  • The facility cost is covered under Part A, and the doctor's fee is covered under Part B, so you won't receive separate bills for each.
  • You must use a Medicare-enrolled provider for the procedure to receive full coverage.

Screening colonoscopy versus diagnostic colonoscopy

Medicare makes a distinction between two types of colonoscopy, and the distinction determines what you pay. A screening colonoscopy is performed when you have no symptoms and no known problems — it's a preventive check for colorectal cancer. Medicare covers this with no cost to you. The procedure itself, the anesthesia, and the facility are all included.

A diagnostic colonoscopy is performed because you have symptoms (like bleeding or abdominal pain), a family history of colorectal cancer, or because a screening colonoscopy found something abnormal. It's also diagnostic if your doctor removes a polyp, takes tissue samples, or performs any treatment during the procedure. In these cases, you owe coinsurance — usually 20 percent of the Medicare-approved amount — after you've met your annual Part B deductible ($240 in 2024, though this amount changes yearly).

The same physical procedure can be either screening or diagnostic depending on what the doctor finds and does. If you go in for a routine screening and the doctor removes a polyp, Medicare will bill the diagnostic rate for coinsurance purposes. This is why it's important to understand your deductible status before the procedure.

What happens if a polyp is removed

When a polyp is found and removed during a colonoscopy, the procedure is reclassified as diagnostic. You will owe coinsurance on the doctor's fee and the facility cost. The amount depends on whether you've already met your Part B deductible for the year.

If you haven't met your $240 deductible, you pay that full amount first. After the deductible is met, you pay 20 percent of the Medicare-approved amount for the rest of the procedure. For example, if the total approved amount is $1,000 and you haven't met your deductible, you'd pay $240 (deductible) plus 20 percent of the remaining $760, which is $152, for a total of $392.

The facility (hospital or outpatient center) bills separately under Part A. You typically owe a copay for an outpatient facility, which varies but is often $250 to $500 depending on the facility and your plan. Ask the facility in advance what their copay is for an outpatient colonoscopy.

Medicare Advantage plan coverage

If you're enrolled in a Medicare Advantage plan, your colonoscopy coverage is determined by your specific plan, not by Original Medicare rules. Most Medicare Advantage plans cover screening colonoscopy with no cost, matching Original Medicare's benefit. However, diagnostic colonoscopy coverage varies widely — some plans charge a copay (often $0 to $250), others charge coinsurance, and some cover it fully.

Your plan documents should list colonoscopy coverage under preventive services (for screening) and diagnostic services. If you can't find this information, call the customer service number on your insurance card. It's worth calling before your procedure to confirm whether the doctor will code it as screening or diagnostic, because that determines your cost.

Some Medicare Advantage plans also have network restrictions, meaning you must use a doctor or facility in their network to receive the covered benefit. Using an out-of-network provider may result in higher costs or no coverage at all. Confirm that your gastroenterologist and the facility where the procedure will take place are in your plan's network.

How to prepare financially before your colonoscopy

Before your procedure, contact your gastroenterologist's office and ask them to estimate the cost. Provide your Medicare information and ask whether they expect the procedure to be coded as screening or diagnostic. If you have a Medicare Advantage plan, also call your plan to confirm your copay or coinsurance amount.

Check your Part B deductible status. You can find this on your Medicare Summary Notice (the annual statement Medicare sends you) or by logging into your Medicare account at Medicare.gov. If you haven't met your deductible and expect a diagnostic procedure, you'll owe the deductible plus coinsurance.

Ask the facility directly what their copay is for an outpatient colonoscopy. This is separate from the doctor's fee and the deductible. Some facilities will let you pay this in advance or set up a payment plan if the cost is high.

What Medicare does not cover

Medicare does not cover colonoscopy more often than once every 10 years if results are normal. If you want screening more frequently than that without a medical reason, you'll pay out of pocket. However, if you have a personal or family history of colorectal cancer, polyps, or inflammatory bowel disease, your doctor may recommend more frequent screening, and Medicare will cover it as medically necessary.

Medicare also does not cover colonoscopy performed at certain types of facilities if they're not Medicare-enrolled. Make sure your procedure is scheduled at a Medicare-approved hospital or outpatient center. If you're unsure, ask your doctor's office whether the facility accepts Medicare.

Certain add-on services or advanced imaging techniques may not be fully covered. For example, if your doctor uses specialized imaging to detect polyps more effectively, Medicare may not cover the full cost of that technology. Ask your doctor in advance if any special techniques will be used and whether they're covered.

Frequently Asked Questions

Do I have to pay anything if my colonoscopy is normal and nothing is removed?

No. If your colonoscopy is performed for screening purposes and the doctor finds nothing abnormal, Medicare covers the entire cost with no copay, coinsurance, or deductible. You pay nothing out of pocket.

What if my doctor finds something but doesn't remove it during the procedure?

If your doctor biopsies tissue or performs any treatment, the procedure is coded as diagnostic and you owe coinsurance. However, if the doctor straightforward observes something and schedules a follow-up procedure to address it later, the initial procedure may still be coded as screening. Ask your doctor's office how they plan to code the procedure.

Can I use my Medigap or Medicaid to cover the coinsurance I owe?

If you have a Medigap (supplemental insurance) plan, it may cover some or all of your coinsurance, depending on your plan. If you have both Medicare and Medicaid, Medicaid may help cover costs. Contact your supplemental insurance or Medicaid office to confirm what they cover for colonoscopy.

What if the doctor's office bills me more than Medicare's approved amount?

Medicare-enrolled providers are required to accept Medicare's approved amount as payment in full. If you're billed more, contact Medicare at 1-800-MEDICARE to report the overcharge. Keep copies of all bills you receive.

Does Medicare cover colonoscopy if I have symptoms like bleeding or abdominal pain?

Yes. If your doctor orders colonoscopy because you have symptoms or a medical condition that requires investigation, Medicare covers it as a diagnostic procedure. You'll owe coinsurance after meeting your deductible, but the procedure itself is covered.