Your out-of-pocket cost for a colonoscopy depends on whether it's screening or diagnostic, and which part of Medicare covers it

If your doctor orders a colonoscopy to screen for colorectal cancer and you have no symptoms, Medicare Part B covers the full cost with no copay, coinsurance, or deductible. If the colonoscopy is diagnostic — meaning your doctor is investigating symptoms like bleeding or abdominal pain — you typically pay 20 percent of the Medicare-approved amount after you meet your Part B deductible, which is $240 in 2024. If your doctor removes polyps or takes a biopsy during the procedure, Medicare may reclassify it as therapeutic rather than screening, which also triggers the 20 percent coinsurance.

The actual dollar amount you pay depends on what your gastroenterologist's office charges and what Medicare allows in your area. Medicare sets a standard reimbursement rate, but the provider's bill may be higher. If your doctor is in-network (accepts Medicare assignment), they can only charge you what Medicare allows. Out-of-pocket costs typically range from $0 for a screening colonoscopy to $300–$500 for a diagnostic one, though this varies by region and facility.

Key Takeaways

  • Screening colonoscopies (no symptoms, routine cancer prevention) are covered at 100 percent with no out-of-pocket cost under Medicare Part B.
  • Diagnostic colonoscopies (investigating symptoms) require you to pay 20 percent of the Medicare-approved amount after your $240 Part B deductible.
  • If polyps are removed or a biopsy is taken, the procedure may be reclassified as therapeutic, triggering the 20 percent coinsurance even if it started as screening.
  • Your actual cost depends on your gastroenterologist's location and whether they accept Medicare assignment; ask the office for an estimate before the procedure.

The difference between screening and diagnostic colonoscopies

Medicare distinguishes between two types of colonoscopy based on the reason your doctor orders it. A screening colonoscopy is performed on people with no symptoms as a routine cancer-prevention measure, usually starting at age 45 or 50 depending on your risk factors. Medicare covers this at 100 percent, meaning you pay nothing — no deductible, no copay, no coinsurance.

A diagnostic colonoscopy is ordered when you have symptoms such as rectal bleeding, persistent abdominal pain, changes in bowel habits, or anemia that your doctor wants to investigate. For this type, you pay 20 percent coinsurance after meeting your Part B deductible. The distinction matters because it determines your cost, so it's worth asking your doctor at the time of referral whether the procedure is being ordered for screening or diagnosis.

What happens if your doctor finds and removes polyps

If your doctor discovers polyps during a screening colonoscopy and removes them, Medicare may reclassify the entire procedure as therapeutic rather than screening. This reclassification means you become responsible for 20 percent coinsurance after your deductible, even though the procedure started as a screening exam. This is one of the most common surprises in colonoscopy billing.

The reclassification depends on the specific code your doctor's office uses when submitting the claim to Medicare. Some offices code it as a screening with a therapeutic component (which may keep it at 100 percent coverage), while others code it as a therapeutic procedure from the start. Before your colonoscopy, ask your gastroenterologist's office how they typically code the procedure if polyps are found, so you know what to expect on your bill.

How to find out your actual cost before the procedure

The best way to know what you'll pay is to contact your gastroenterologist's office and ask for an estimate. Tell them whether the procedure is screening or diagnostic, and ask them to look up the Medicare-approved amount for your area. They can then calculate your share based on whether you've already met your Part B deductible for the year.

You can also call Medicare directly at 1-800-MEDICARE to ask what the approved amount is in your region for a colonoscopy. Have your doctor's name and location ready. If you use a Medigap or Medicare Advantage plan, contact that plan's customer service — they may cover some or all of your coinsurance, depending on your specific policy.

Medicare Advantage plans and colonoscopy costs

If you have a Medicare Advantage plan (Part C) instead of Original Medicare, your colonoscopy costs work differently. Most Medicare Advantage plans cover screening colonoscopies at no cost, just like Original Medicare. However, copays and coinsurance for diagnostic colonoscopies vary by plan — some plans charge a copay (typically $0–$250), while others charge coinsurance.

Check your plan's summary of benefits or call the plan's customer service line to find out your specific cost. If your plan requires a referral from your primary care doctor before you see a gastroenterologist, make sure you have that in place before scheduling, because some plans won't cover the procedure without it.

Medigap coverage for colonoscopy costs

If you have Original Medicare plus a Medigap policy, your Medigap plan may cover some or all of your coinsurance for a diagnostic colonoscopy. Medigap Plan G, for example, covers 100 percent of your Part B coinsurance after you meet the deductible. Plans C, D, F, and M also cover coinsurance, though the details vary.

Check your Medigap policy documents or call your Medigap insurer to confirm what they cover for colonoscopy. If you don't have Medigap and are facing a diagnostic colonoscopy with significant out-of-pocket cost, ask your gastroenterologist's office whether they offer a payment plan or discount for uninsured or underinsured patients.

What to do if you receive an unexpected bill

If you receive a bill that seems higher than expected, first check that the procedure was coded correctly. Request an itemized bill from your gastroenterologist's office and compare it to the Medicare Summary Notice (MSN) you'll receive from Medicare, which shows what Medicare paid and what you owe. If the office billed you for something Medicare should have covered, contact the office's billing department and ask them to resubmit the claim with the correct code.

If you believe the bill is incorrect or you disagree with how the procedure was classified, you can file an appeal with Medicare. You have 120 days from the date on your MSN to request an appeal. Contact Medicare at 1-800-MEDICARE or visit Medicare.gov to learn how to file.

Frequently Asked Questions

Do I have to pay anything for a screening colonoscopy?

No. If your doctor orders the colonoscopy for routine cancer screening and you have no symptoms, Medicare Part B covers 100 percent of the cost. You pay nothing — no deductible, copay, or coinsurance. This applies whether you have Original Medicare or a Medicare Advantage plan.

Why did I get charged for a screening colonoscopy when I thought it was free?

The most common reason is that your doctor found and removed polyps during the procedure, which caused the office to reclassify it as therapeutic. Ask your gastroenterologist's office to review the billing code they submitted to Medicare. If the code is wrong, ask them to resubmit with the correct one. If the code is correct but you disagree with the reclassification, you can appeal to Medicare.

How much does a colonoscopy cost if I don't have Medicare?

Without insurance, a colonoscopy typically costs $1,500 to $3,000 depending on the facility and region. Many gastroenterology offices offer discounts for uninsured patients who pay out of pocket. Call ahead and ask whether the office has a cash-pay discount or payment plan available.

Will my Medicare Advantage plan cover a colonoscopy the same way Original Medicare does?

Most Medicare Advantage plans cover screening colonoscopies at no cost, like Original Medicare. However, costs for diagnostic colonoscopies vary by plan. Check your plan's summary of benefits or call customer service to find out your specific copay or coinsurance. Some plans also require a referral from your primary care doctor before you see a gastroenterologist.

What if I haven't met my Part B deductible yet?

If you have a diagnostic colonoscopy and haven't met your $240 Part B deductible, you'll pay the full deductible first, then 20 percent coinsurance on the remaining amount. If you have a Medigap plan, it may cover your deductible and coinsurance. Check your Medigap policy or call your insurer to confirm.