Does Medicare Cover Cologuard (At-Home Colon Screening)? (2026)

Direct Answer: Yes, Medicare Covers Cologuard at No Cost (With Conditions)

Yes. Medicare Part B covers Cologuard at no cost for average-risk beneficiaries age 45 and older who have no colorectal symptoms. The test must be ordered by a physician or other qualified health care professional, and the claim must use CPT 81528 (the Medicare billing code for multi-target stool DNA testing). Colorectal cancer screening is an ACA Essential Health Benefit, and under the ACA preventive services framework, Medicare pays 100% with no deductible and no copay.

What 'Average-Risk' Means for Medicare Cologuard Coverage

Medicare defines average-risk for colorectal cancer screening as a beneficiary who has no personal history of adenomatous polyps, no personal history of colorectal cancer, no family history of colorectal cancer in a first-degree relative (parent, sibling, or child), no inflammatory bowel disease (Crohn's disease or ulcerative colitis), and no current symptoms of colorectal disease. Current symptoms that disqualify you from the preventive rate include rectal bleeding, a change in bowel habits lasting more than a few weeks, unexplained weight loss, abdominal pain or cramping, or anemia without a clear cause.

If any of these risk factors exist, a colonoscopy (not Cologuard) is typically the appropriate screening tool, and Medicare uses different coverage rules for high-risk patients. High-risk patients may get a colonoscopy covered every 2 years under Medicare rather than every 10 years, but Cologuard itself is not the recommended tool for high-risk surveillance.

The Billing Trap: Preventive vs. Diagnostic and How to Avoid It

The most common source of unexpected bills for Cologuard on Medicare is a billing error or a change in clinical classification. Three scenarios convert the test from a zero-cost preventive screening to a cost-sharing diagnostic test.

• Wrong billing code used: If the lab or ordering physician does not use CPT 81528 (the Medicare billing code for multi-target stool DNA testing, active since January 1, 2016), Medicare will not apply the preventive benefit. Ask your physician's office to confirm CPT 81528 is on the order before it is submitted.
• Patient has symptoms: If the patient reports or the physician documents any colorectal symptom at the time of ordering, the test is automatically classified as diagnostic. The 2026 Part B deductible of $283 and 20% coinsurance would apply, and the patient would owe approximately $163 to $200 on a $600 to $700 test.
• Too early since last test: If a Cologuard is ordered before 3 years have elapsed since the previous one billed to Medicare, Medicare will deny the claim as a frequency limit violation. The patient would owe the full retail cost.

What Original Medicare and Medicare Advantage Each Cover

Original Medicare (Part A and Part B) covers Cologuard under Part B as a preventive benefit. The federal mandate comes from CMS National Coverage Determination (NCD) 210.3, which classifies colorectal cancer screening using multi-target stool DNA tests as a covered preventive service. Medicare Advantage plans (Part C) are required by law to cover all benefits that Original Medicare covers, including this preventive colorectal screening. In practice, most Medicare Advantage plans cover Cologuard at $0 cost-sharing for in-network providers, but the exact plan terms appear in each plan's Evidence of Coverage document.

Medigap (Medicare Supplement) plans do not add a separate Cologuard benefit because Original Medicare already pays 100% for this preventive screening. There is no cost-sharing for Medigap to supplement. Part D (prescription drug coverage) does not apply here because Cologuard is a diagnostic test kit, not a drug.

Cost Without Medicare Coverage in 2026

Without Medicare or any other insurance, the self-pay price for Cologuard is $600 to $700 in 2026, based on Exact Sciences' list price. Some patients negotiate directly with Exact Sciences' patient assistance program, which offers reduced pricing for uninsured patients below certain income thresholds. The Exact Sciences financial assistance program is available at exactsciences.com. For comparison, an out-of-pocket colonoscopy in 2026 runs $1,250 to $4,800 depending on facility, geographic market, and whether anesthesia is billed separately.

Cologuard vs. Colonoscopy: Which Does Medicare Cover Better?

Medicare covers both Cologuard and colonoscopy as colorectal cancer screening tools, with different frequency rules. Colonoscopy is covered every 10 years for average-risk patients and every 2 years for high-risk patients, with no out-of-pocket cost when performed as a preventive screening. If the colonoscopist removes a polyp during a preventive colonoscopy, the procedure converts to a diagnostic service and cost-sharing may apply, although many Medicare Advantage plans have eliminated this 'biopsy trap' by waiving the cost-sharing even when polyps are removed.

The core trade-off between Cologuard and colonoscopy for average-risk Medicare patients: Cologuard requires no bowel prep, no sedation, no ride home, and is done at home every 3 years. A colonoscopy requires full bowel prep, sedation, a driver, and happens every 10 years. However, Cologuard does not remove polyps; if Cologuard returns a positive result, a follow-up diagnostic colonoscopy is required. Medicare Part B covers that follow-up diagnostic colonoscopy, but standard diagnostic cost-sharing (2026 Part B deductible of $283 plus 20% coinsurance) may apply.

How to Get Cologuard Covered by Medicare: Step by Step

Getting Cologuard covered by Medicare with no out-of-pocket cost requires a few specific steps.

• Step 1: Ask your primary care physician or other Medicare provider to order Cologuard as a colorectal cancer screening at your annual wellness visit or any office visit. Confirm that you have no current colorectal symptoms before the order is placed.
• Step 2: Confirm that the order specifies CPT 81528 (the Medicare billing code for multi-target stool DNA testing). This is the code that triggers zero cost-sharing for the preventive benefit.
• Step 3: Exact Sciences ships the Cologuard kit directly to your home. Collect the stool sample per the instructions and mail it back in the prepaid return box.
• Step 4: Results are sent to your physician, typically within 10 to 14 days. If the result is positive (abnormal), your physician will schedule a follow-up diagnostic colonoscopy.
• Step 5: Check your Medicare Summary Notice (MSN) when it arrives. If you see any out-of-pocket charge for a Cologuard preventive screening, call 1-800-MEDICARE (1-800-633-4227) and ask for a claims review. Most billing errors can be corrected.

Dual-Eligible (Medicare and Medicaid): What Changes?

About 12 million Americans qualify for both Medicare and Medicaid (dual-eligible beneficiaries). For Cologuard, dual-eligible patients typically pay nothing because Original Medicare covers 100% of the preventive screening and Medicaid fills any remaining cost-sharing. Dual-eligible beneficiaries enrolled in a Dual Eligible Special Needs Plan (D-SNP) through Medicare Advantage receive the same preventive Cologuard benefit as other Medicare beneficiaries, often with additional care coordination to ensure the test gets ordered and processed correctly.

Does Original Medicare cover Cologuard in 2026?

Yes. Original Medicare Part B covers Cologuard every 3 years for average-risk patients age 45 and older with no colorectal symptoms. The claim must be billed using CPT 81528. When properly billed as a preventive screening, there is no copay and the 2026 Part B deductible of $283 does not apply.

Does Medicare Advantage cover Cologuard?

Yes. Medicare Advantage plans (Part C) are legally required to cover all Original Medicare benefits, including preventive Cologuard screening. Most Medicare Advantage plans cover the test at $0 cost-sharing for in-network orders. Check your plan's 2026 Evidence of Coverage or call the plan's member services line to confirm network and cost details.

What is CPT 81528 and why does it matter for Medicare Cologuard coverage?

CPT 81528 is the Medicare billing code for multi-target stool DNA testing (Cologuard). Using CPT 81528 triggers Medicare's preventive screening benefit, meaning $0 cost to the patient. The older HCPCS code G0464 was deleted effective December 31, 2015. Claims billed with an incorrect or outdated code may not be recognized for the preventive benefit and the patient may receive an unexpected bill.

What does Cologuard cost without Medicare in 2026?

Without Medicare or other insurance, Cologuard costs $600 to $700 in 2026 based on Exact Sciences' list price. Exact Sciences offers a patient assistance program with reduced pricing for uninsured patients who meet income criteria. For comparison, an uninsured colonoscopy runs $1,250 to $4,800 in 2026, depending on facility and market.

How often does Medicare cover Cologuard?

Medicare covers Cologuard every 3 years for average-risk patients. Ordering the test before 3 years have passed since the previous Medicare-covered Cologuard will result in a claim denial, and the patient would owe the full out-of-pocket cost. The 3-year frequency is set by CMS National Coverage Determination 210.3.

Can I choose Cologuard over a colonoscopy on Medicare?

Yes, for average-risk patients age 45 and older. Both are covered by Medicare Part B at no cost when properly ordered as preventive screenings. Cologuard is done at home every 3 years with no bowel prep or sedation. Colonoscopy is done in a facility every 10 years (or 2 years for high-risk patients) and can remove polyps directly. A positive Cologuard result requires a follow-up diagnostic colonoscopy.

What happens if my Cologuard result is positive?

A positive Cologuard result does not mean you have cancer; it means abnormal cells or DNA were detected and further investigation is needed. Medicare Part B will cover a follow-up diagnostic colonoscopy, but since it is classified as diagnostic rather than preventive, the 2026 Part B deductible of $283 and 20% coinsurance may apply. Many Medicare Advantage plans waive this cost-sharing. Check your plan's details before the colonoscopy.

Does Medicare cover Cologuard for patients under 65?

Yes, if they qualify for Medicare on the basis of disability or end-stage renal disease (ESRD). Medicare eligibility is not limited to age 65. Any Medicare Part B enrollee who is age 45 or older and meets the average-risk criteria may receive covered Cologuard. Patients under 45 who are on Medicare due to disability are not covered for Cologuard under the preventive screening benefit, as the age threshold is 45.