Does Medicare cover a colonoscopy?

Short answer

Medicare Part B covers screening colonoscopy at $0 cost-sharing when the provider accepts assignment. Frequency is every 24 months for high-risk beneficiaries and every 120 months for average-risk. If a polyp is found and removed, the patient pays 15 percent of the Medicare-approved amount for the provider’s services.

The screening coverage rule

Per the Medicare.gov coverage page for colonoscopies:

• Every 24 months for high-risk beneficiaries. “Once every 24 months if you’re at high risk for colorectal cancer.”
• Every 120 months for average-risk beneficiaries. “Once every 120 months, or 48 months after a previous flexible sigmoidoscopy.”
• No minimum age requirement. “There’s no minimum age requirement to get a screening.”

Cost-sharing — the $0 case

“If your doctor or other health care provider accepts assignment, you pay nothing for the screening test(s).”

Two conditions have to hold for the zero-dollar benefit:

1. The colonoscopy is billed as a screening (preventive) service.
2. The provider accepts Medicare assignment.

Both conditions typically hold at most gastroenterologists and endoscopy centers, but they are worth confirming before the procedure.

The polyp-removal transition

Here is where beneficiaries often get surprised.

Per the same Medicare.gov page: “If your health care provider finds and removes a polyp or other tissue during the colonoscopy, you pay 15% of the Medicare-approved amount for your provider’s services.”

The colonoscopy procedure transitions from preventive to diagnostic the moment tissue is removed. The 15 percent coinsurance applies to the provider’s fee for the removal. Cost-sharing does not apply to the facility fee for a covered screening under the ACA/Medicare preventive-services rules.

What this looks like in practice: a beneficiary schedules a screening colonoscopy expecting $0 cost. During the procedure the gastroenterologist removes a 5mm polyp. The bill shows a small charge — typically $50-$150 out of pocket — for the polyp-removal component of the physician’s fee.

Medigap plans typically cover this 15 percent coinsurance. Medicare Advantage plans set their own copay structure.

What “high risk” means

High-risk indicators that trigger the 24-month frequency:

• Personal history of colorectal cancer, adenomas, or inflammatory bowel disease.
• Family history of colorectal cancer or adenomas in a first-degree relative.
• Positive stool test (FIT or FOBT) result within the prior year.
• Genetic syndromes associated with colorectal cancer (Lynch syndrome, FAP).

A primary care physician determines whether a beneficiary qualifies as high risk based on personal and family history.

Related screening options Medicare covers

Colonoscopy is one of several colorectal cancer screening methods Medicare covers:

• Fecal Immunochemical Test (FIT): annually.
• Fecal Occult Blood Test (gFOBT): annually.
• Multi-target stool DNA test (Cologuard): every 3 years for average-risk beneficiaries.
• Flexible sigmoidoscopy: every 48 months (with different frequency for follow-up colonoscopy).
• Blood-based colorectal cancer screening (Shield): approved by Medicare in 2024 for average-risk beneficiaries.

A primary care physician can advise on which test is right based on risk profile, personal preference, and prior screening history.

When Medicare denies coverage

• The colonoscopy is diagnostic from the start (evaluating symptoms — bleeding, changes in bowel habit, unexplained weight loss). This is billed as diagnostic and the standard 20 percent coinsurance applies (not the preventive $0 rate).
• Frequency exceeds the covered interval. A follow-up colonoscopy sooner than 120 months in an average-risk beneficiary requires medical necessity documentation.
• The provider does not accept assignment. In that case, standard 20 percent coinsurance applies plus any excess charges the provider assesses.

When a patient advocate helps

• Reviewing the pre-procedure estimate. An advocate can confirm the procedure is being scheduled as a screening, verify provider assignment status, and identify any risk of unexpected charges.
• Reviewing the post-procedure bill. If charges appear larger than expected after a screening colonoscopy — for facility fees, for anesthesia, for polyp removal — an advocate can review whether the billing matches Medicare’s rules.
• Coordinating with the primary care physician. For beneficiaries with risk factors that could justify high-risk designation (thereby every-24-months frequency), documentation from the PCP is important.

Contact Baba Care if a colonoscopy is scheduled and the paperwork raises questions.

Frequently asked questions

How much does a Medicare-covered screening colonoscopy cost? Zero, if the provider accepts assignment and no polyps are removed. If polyps are removed, 15 percent of the provider’s services (typically $50-$150).

How often can I get a screening colonoscopy? Every 24 months if high risk; every 120 months if average risk.

Does Medicare cover the anesthesia during a colonoscopy? Yes, when medically necessary. Anesthesia during a screening colonoscopy is covered at $0 if the anesthesiologist accepts assignment.

What if I need a follow-up colonoscopy sooner than the interval? It can be covered if medically necessary — for instance, follow-up on a removed polyp or evaluation of new symptoms. This becomes diagnostic and standard cost-sharing applies.

Does Medicare Advantage cover screening colonoscopy at $0? MA plans must cover screening at least at Original Medicare’s level. Some plans set specific copays; check the plan’s Evidence of Coverage.

About Baba Care. Baba Care is a patient advocacy service supporting families navigating Medicare and complex care decisions.

Medical / financial disclaimer. This article is educational and does not constitute medical, financial, or legal advice.