Medicare Part B Coverage: What’s Included and What Isn’t

When people ask what Medicare Part B covers, they usually want one thing: to know which everyday medical costs they can expect Medicare to pay for—and which will still come out of their own pocket. Understanding this helps you avoid surprise bills and decide whether you need extra coverage.

The Core of Part B: Medically Necessary Services

Medicare Part B helps pay for medically necessary services and supplies needed to diagnose or treat a condition. In practice, that typically includes:

• Doctor visits: Office visits with primary care doctors and specialists, whether in a clinic, hospital outpatient department, or telehealth (for covered services).
• Outpatient care: Services you receive without being admitted as an inpatient, such as same‑day surgery, observation stays, or hospital outpatient tests.
• Diagnostic tests and imaging: X‑rays, MRIs, CT scans, lab tests, and other ordered tests when they’re medically necessary.
• Preventive care: Screenings and services aimed at finding problems early, often covered at no cost if you meet eligibility rules. Examples include:
  • Annual wellness visits
  • Flu, COVID‑19, and other recommended vaccines
  • Certain cancer screenings (such as mammograms and colonoscopies, within Medicare rules)
  • Screenings for conditions like diabetes, cardiovascular disease, and depression

Durable Medical Equipment and Supplies

Part B covers durable medical equipment (DME) your provider orders for use at home, when medically necessary. Common examples:

• Walkers, canes, and wheelchairs
• Home oxygen equipment and supplies
• CPAP machines and related supplies for sleep apnea
• Certain glucose monitors and test strips for diabetes

These items must typically be obtained from suppliers that accept Medicare, and coinsurance and deductibles apply.

Therapy, Mental Health, and Other Key Services

Part B also helps pay for ongoing treatments and support services, including:

• Physical, occupational, and speech therapy when ordered by a doctor and considered reasonable and necessary for your condition.
• Outpatient mental health care: Visits with psychiatrists, psychologists, clinical social workers, and other qualified professionals, plus partial hospitalization programs when appropriate.
• Home health services: Part‑time or intermittent skilled nursing care, physical therapy, occupational therapy, and speech‑language pathology, when you meet Medicare’s home health criteria.
• Ambulance services: Ground or air ambulance transportation when any other form of transportation could endanger your health and you’re going to a Medicare-approved facility.

What Part B Typically Does Not Cover

It’s just as important to know what isn’t covered under Part B:

• Routine dental care, dentures, and most vision care (eye exams for glasses or contacts) are not covered in most cases.
• Hearing aids and routine hearing exams are generally not covered.
• Most prescription drugs you take at home are not covered by Part B; they’re usually covered under Medicare Part D. Part B does cover certain drugs given in a doctor’s office or outpatient setting, such as some injections and infusions.
• Long‑term custodial care, like help with bathing, dressing, or eating in a nursing home, is not covered by Part B.

Bringing It All Together

Think of Medicare Part B as the part of Medicare that follows you to the doctor’s office, outpatient clinic, or home: it focuses on medically necessary services, preventive care, and essential equipment, not routine dental, vision, hearing, or long‑term care. Knowing these boundaries helps you plan for deductibles, coinsurance, and possible gaps where other coverage—like a Medigap plan, employer coverage, or a Medicare Advantage plan—might be worth considering.