One of the most valuable aspects of Medicare is its coverage of preventive services at no cost to you. These screenings, tests, and vaccinations are designed to catch health problems early or prevent them entirely. Yet many beneficiaries do not take advantage of them, either because they do not know what is available or because they worry about the cost.
The good news: under Medicare Part B, dozens of preventive services are covered with $0 out-of-pocket cost, as long as you meet the eligibility criteria and your provider accepts Medicare assignment.
What Makes a Service "Preventive"?
This is a critical distinction that trips up many Medicare beneficiaries. A preventive service is one that is performed to screen for a condition you do not yet have symptoms of. It is routine, scheduled care intended to detect problems before they become serious.
A diagnostic service, on the other hand, is ordered because you already have symptoms, a complaint, or a known condition that needs further investigation. Even if the test itself is identical, how and why it is ordered determines whether Medicare treats it as preventive (free) or diagnostic (subject to cost-sharing).
For example, a colonoscopy performed as a routine screening is free. But if polyps are found and removed during the procedure, the claim may be reclassified as diagnostic, and you could owe coinsurance. This billing nuance catches many people off guard.
Cancer Screenings
Medicare covers several cancer screenings at no cost:
- Mammograms (breast cancer): Covered once every 12 months for women age 40 and older. A baseline mammogram is also available for women ages 35 to 39.
- Colorectal cancer screening: Several options are covered, including a colonoscopy every 10 years (or every 2 years for high-risk individuals), a fecal occult blood test every 12 months, and stool DNA tests every 3 years.
- Cervical and vaginal cancer screening: Pap tests and pelvic exams are covered every 24 months, or every 12 months for women at high risk.
- Prostate cancer screening (PSA test): A digital rectal exam and PSA blood test are covered once every 12 months for men age 50 and older.
- Lung cancer screening: A low-dose CT scan is covered annually for adults ages 50 to 77 with a significant smoking history who currently smoke or quit within the past 15 years.
Cardiovascular Screenings
Heart disease is a leading cause of death among older adults, and Medicare covers several related tests:
- Cardiovascular disease screening: Blood tests to check cholesterol, lipid, and triglyceride levels are covered every 5 years.
- Abdominal aortic aneurysm screening: A one-time ultrasound is available for men ages 65 to 75 who have ever smoked.
- Cardiovascular disease behavioral therapy: An annual visit with your primary care doctor to discuss aspirin use, blood pressure management, and healthy habits.
Diabetes-Related Services
- Diabetes screening tests: Covered up to twice per year if you have certain risk factors, such as high blood pressure, obesity, or a history of abnormal blood sugar.
- Diabetes self-management training: Group or individual sessions to help you manage diabetes, including nutrition counseling.
- Medical nutrition therapy: Available for people with diabetes or kidney disease, this includes sessions with a registered dietitian.
Behavioral Health Screenings
- Depression screening: Covered once per year in a primary care setting. The visit must include follow-up planning if screening results are positive.
- Alcohol misuse screening and counseling: Annual screening and up to 4 brief counseling sessions per year for those who screen positive.
- Tobacco cessation counseling: Medicare covers up to 8 counseling sessions in a 12-month period to help you quit smoking.
Vaccines Covered by Medicare
Vaccines are split between Part B and Part D:
- Flu shots: Covered once per flu season under Part B at no cost.
- Pneumonia (pneumococcal) vaccine: Covered under Part B with no copay.
- Hepatitis B vaccine: Covered under Part B if you are at medium to high risk.
- COVID-19 vaccines: Covered under Part B with no out-of-pocket cost.
- Shingles, Tdap, and other vaccines: These fall under Part D and are subject to your plan's cost-sharing rules.
Other Preventive Services Worth Knowing About
Medicare covers a number of additional preventive services that many beneficiaries overlook:
- Bone mass measurement (DEXA scan): Covered every 24 months for those at risk of osteoporosis.
- Glaucoma tests: Covered once every 12 months for people at high risk, including those with diabetes, a family history, or African Americans age 50 and older.
- HIV screening: Covered annually for all beneficiaries, or up to 3 times during pregnancy.
- Hepatitis C screening: A one-time test for adults born between 1945 and 1965, plus annual screening for those at high risk.
- Sexually transmitted infection screening and counseling: Covered for those at increased risk, with up to 2 individual counseling sessions per year.
- Obesity screening and counseling: For beneficiaries with a BMI of 30 or higher, Medicare covers intensive behavioral therapy sessions with a primary care provider.
How to Get Your Preventive Services at No Cost
To ensure your preventive care is truly free, follow these guidelines:
- Use a provider who accepts Medicare assignment. If your doctor does not accept assignment, you may owe additional charges.
- Confirm the visit is coded as preventive. Ask your provider to bill the service as a screening, not a diagnostic test.
- Do not combine preventive visits with other complaints. If you bring up new symptoms during a preventive screening, the visit may be partially billed as an office visit, triggering cost-sharing.
- Track your screening schedule. Medicare has specific intervals for each service. Getting a test too early could mean you owe the full cost.
Final Thoughts
Medicare's preventive benefits are among the most generous of any health insurance program, covering everything from cancer screenings to behavioral health counseling at no cost to you. Taking advantage of these services is one of the smartest things you can do for your long-term health. Talk to your doctor about which screenings are due and make sure they are billed correctly to avoid surprise charges. For details on what your annual wellness visit includes, see our dedicated guide.