Medicare covers one colonoscopy every 10 years if the results are normal, with no out-of-pocket cost to you

Medicare Part B pays for a screening colonoscopy at no charge when your doctor orders it for colorectal cancer prevention — meaning you pay nothing for the procedure itself, the anesthesia, or the pathology work. The catch is timing: if your last colonoscopy was normal, Medicare will not pay for another one until 10 years have passed. If polyps were found and removed, the interval changes based on what was found, and your doctor will tell you when to schedule the next one.

This coverage applies only to people 50 and older. If you are under 50, Medicare does not cover screening colonoscopy unless you have symptoms or a family history that your doctor documents as a medical reason.

Key Takeaways

  • Medicare covers one screening colonoscopy every 10 years at no cost if results are normal.
  • If polyps are removed, your next colonoscopy may be due sooner — usually 3, 5, or 7 years depending on what was found.
  • You must be 50 or older, and your doctor must order it for cancer screening, not for symptoms.
  • If you have symptoms like bleeding or changes in bowel habits, a colonoscopy is covered as a diagnostic test, not a screening, and the 10-year rule does not explore.

The 10-year interval for normal results

When a colonoscopy finds no polyps and no abnormalities, Medicare's rule is straightforward: your next screening colonoscopy is covered 10 years later. Your doctor's office should note the date in your medical record so you and they both know when you are due again.

This 10-year window is based on the evidence that a normal colonoscopy means your colorectal cancer risk is low for that period. If you schedule one sooner — say, at 8 years — Medicare will likely deny the claim because it does not meet the coverage rule. You would then owe the full cost yourself, which can range from $1,000 to $3,000 depending on the facility.

Shorter intervals when polyps are found

If your doctor finds and removes polyps, the next colonoscopy is usually due sooner. The exact timing depends on the type, size, and number of polyps removed:

  • Small polyps with low-risk features: next colonoscopy in 7 to 10 years.
  • Intermediate-risk polyps: next colonoscopy in 3 to 5 years.
  • High-risk polyps or multiple polyps: next colonoscopy in 1 to 3 years.

Your gastroenterologist will tell you the recommended interval before you leave the procedure or in a follow-up letter. Write this date down or ask your doctor's office to send you a reminder when you are approaching the due date. Medicare will cover the next colonoscopy on that schedule, even if it is sooner than 10 years.

Colonoscopy for symptoms versus screening

If you have symptoms — blood in stool, persistent diarrhea, abdominal pain, or changes in bowel habits — your doctor may order a colonoscopy as a diagnostic test, not a screening. In this case, the 10-year rule does not explore. Medicare covers it because there is a medical reason, and you can have another one sooner if symptoms return or your doctor thinks it is medically necessary.

The difference matters because a diagnostic colonoscopy is covered based on medical need, not on a schedule. If you had a normal screening colonoscopy 3 years ago but now have bleeding, a new colonoscopy is covered because the indication is different.

What Medicare does and does not pay for

Medicare Part B covers the colonoscopy procedure itself, sedation, and the pathologist's reading of any tissue samples — all at no cost to you. You do not pay a copay, coinsurance, or deductible for a covered screening colonoscopy.

What Medicare does not cover: if your doctor finds something that requires follow-up imaging (like a CT scan) or additional procedures, those are billed separately and may have out-of-pocket costs depending on your coverage. If a polyp is large or complex and cannot be removed during the colonoscopy, a second procedure may be needed, and you should ask your doctor whether Medicare will cover it before it happens.

How to track your colonoscopy due date

After your colonoscopy, ask your doctor's office for a written summary that includes the date of the procedure and the recommended date for your next one. Keep this in your personal health records — a folder, a photo on your phone, or a note in your calendar.

Some medical practices send reminder letters or calls when you are due. If yours does not, mark your calendar 9 years after a normal colonoscopy so you have time to schedule before the 10-year window closes. If you switch doctors or health systems, bring this summary with you so your new doctor knows your history and does not order a colonoscopy too soon.

If you are under 50 or have risk factors

Medicare does not cover screening colonoscopy before age 50 unless you have a documented risk factor — a family history of colorectal cancer, a personal history of polyps or inflammatory bowel disease, or genetic syndromes like Lynch syndrome. If you have one of these, talk to your doctor about whether screening is recommended for you and whether Medicare will cover it. Your doctor will need to document the medical reason in your chart.

If you are under 50 and want screening without a documented risk factor, you would pay out of pocket. Some community health centers or hospital financial information programs offer reduced-cost colonoscopies; ask your doctor or call your local health department for options in your area.

Frequently Asked Questions

What if I had a colonoscopy at a different health system — will Medicare know?

Medicare has a record of colonoscopies it paid for, but not all of them. If you had one at a hospital or clinic that billed Medicare, it is in the system. If you paid out of pocket or used a different insurance, Medicare may not have the record. Always bring your own documentation — the procedure report or summary letter — to your new doctor so they can see the actual findings and know when you are due.

Can I get a colonoscopy more often than the recommended interval?

You can have one, but Medicare will not pay for it if it is sooner than recommended. You would owe the full cost. The only exception is if your doctor has a medical reason — new symptoms or a change in your health — that makes it medically necessary. Your doctor would need to document this reason for Medicare to cover it.

What happens if I miss my due date?

If you are past due for a colonoscopy, Medicare will still cover it. There is no penalty or expiration date. However, the longer you wait past a normal result, the higher your colorectal cancer risk becomes, so it is worth scheduling as soon as you realize you are overdue.

Does Medicare Advantage cover colonoscopy the same way?

Most Medicare Advantage plans cover screening colonoscopy at no cost, following the same 10-year interval for normal results. However, some plans may have different rules about which facilities you can use or may require prior authorization. Check your plan's coverage details or call the member services number on your card before scheduling.

If a polyp is found but not removed, when is my next colonoscopy?

If your doctor sees a polyp but decides not to remove it — because it is too large, in a difficult location, or for another clinical reason — they will recommend a follow-up colonoscopy sooner than 10 years, usually within 3 to 6 months. Medicare will cover it based on your doctor's recommendation. Ask your doctor to explain why the polyp was not removed and when you should return.