Dear Savvy Senior: How does Medicare cover preventive health screenings? I’m due to get a physical and a colonoscopy this year, but I want to find out what I’ll have to pay for before I go in. — Just Turned 65

Dear Turned 65: You’ll be happy to know that Medicare covers a wide array of preventive and screening services to help you stay healthy, but not all services are completely covered. Here’s what you should know.

Free preventive benefits

Most of Medicare’s preventive services are available to all beneficiaries (through Part B) completely free with no copays or deductibles, as long as you meet basic eligibility standards. Mammograms; colonoscopies; shots against flu, pneumonia, COVID-19 and hepatitis B; screenings for diabetes, depression, osteoporosis, HIV, various cancers and cardiovascular disease; and counseling to combat obesity, alcohol abuse and smoking are just some of Medicare’s lengthy list of covered services. But to get these services for free, you need to go to a doctor who accepts Medicare “on assignment,” which means he or she has agreed to accept the Medicare-approved rate as full payment.

Also, the tests are free only if they’re used at specified intervals. For example, cardiovascular screening blood tests once every five years; or colonoscopy, once every 10 years, or every two years if you’re at high risk.

Medicare also offers a free “Welcome to Medicare” exam with your doctor in your first year, along with annual “wellness” visits thereafter. But don’t confuse these with full physical examinations. These are prevention-focused visits that provide only an overview of your health and medical risk factors and serve as a baseline for future care.

Cost-sharing services

There are, however, a few Medicare preventive services that do require some out-of-pocket cost sharing. With these tests, you’ll have to pay 20% of the cost of the service after you’ve met your $226 Part B yearly deductible. The services that fall under this category include glaucoma tests, diabetes self-management trainings, barium enemas to detect colon cancer, and digital rectal exams to detect prostate cancer.

For a complete list of services along with their eligibility requirements, visit 808ne.ws/preventiveservices.

If you’re enrolled in a Medicare Advantage (Part C) plan, your plan is also required to cover the same preventive services as original Medicare, as long as you see in-network providers.

Hidden costs

You also need to know that while most of the previously listed Medicare services are free, you can be charged for certain diagnostic services or additional tests or procedures related to the preventive service. For example, if your doctor finds and removes a polyp during your preventive care colonoscopy screening, you will pay 15% of the doctor’s service fee. Or, if during your annual wellness visit, your doctor needs to investigate or treat a new or existing problem, you will probably be charged for that as well.

You may also have to pay a facility fee depending on where you receive the service. Certain hospitals, for example, will often charge separate facilities fees when you are receiving a preventive service. And you can also be charged for a doctor’s visit if you meet with a physician before or after the service.

To eliminate billing surprises, talk to your doctor before any preventive service procedure to find out if you may be subject to a charge and what it would be.

Jim Miller is a contributor to NBC-TV’s “Today” program and author of “The Savvy Senior.” Send your questions to Savvy Senior, P.O. Box 5443, Norman, OK 73070; or visit savvysenior.org.