Original Medicare coverage is the federal health insurance most Americans get when they turn 65. It has two parts. Part A is hospital insurance. Part B is medical insurance.
Together they pay for a wide range of care, from inpatient hospital stays to doctor visits and preventive screenings. However, many people are surprised by what Original Medicare coverage leaves out. Routine dental care, eyeglasses, hearing aids, and long-term custodial care are mostly not included. Knowing where the lines fall helps beneficiaries and their families plan for costs, choose supplemental coverage, and avoid surprise bills. More than 65 million people are enrolled in Medicare, and roughly half still use the original program instead of a Medicare Advantage plan.
What Original Medicare Coverage Includes Under Part A
Part A covers care you get as a formally admitted hospital inpatient. That includes a semi-private room, meals, nursing care, drugs given during your stay, and hospital services and supplies. It also covers inpatient care in a critical access hospital and inpatient rehabilitation facilities. Inpatient psychiatric hospital care is covered too. However, care in a freestanding psychiatric hospital has a 190-day lifetime limit.
Part A also pays for skilled nursing facility (SNF) care. To qualify, you need a qualifying inpatient hospital stay of at least 3 days first. Medicare covers up to 100 days of SNF care per benefit period. The first 20 days carry no daily coinsurance. Days 21 through 100 require a daily coinsurance payment. After day 100, you pay the full cost. Note that time spent under “observation status” does not count toward the 3-day requirement. Always ask the hospital whether you are admitted or under observation.
Part A covers hospice care for people with a terminal illness and a life expectancy of 6 months or less. It also covers some home health care and blood received during an inpatient stay. Most people pay no Part A premium. You qualify for premium-free Part A if you or your spouse worked and paid Medicare taxes for at least 40 quarters, or about 10 years. As a result, Part A costs come mainly from the deductible and coinsurance, not a monthly premium.
Part A uses “benefit periods” rather than calendar years. A benefit period begins the day you are admitted. It ends after you have gone 60 days in a row without inpatient or SNF care. Because of this, you can pay the Part A deductible more than once in a single year. Hospital days 61 through 90 require daily coinsurance. After that, you can draw on 60 “lifetime reserve days.” Once those are used, they never come back.
What Part B Covers: Doctors, Outpatient Care, and Prevention
Part B fills in most of the medical care that happens outside a hospital bed. This side of original medicare coverage pays for two broad categories. The first is medically necessary services. The second is preventive services. Most people pay a standard monthly Part B premium. Higher-income beneficiaries pay more under the Income-Related Monthly Adjustment Amount (IRMAA), which the Social Security Administration sets using tax returns from two years earlier.
After you meet the yearly Part B deductible, you typically pay 20% of the Medicare-approved amount. Medicare pays the other 80%. There is no annual out-of-pocket maximum. That open-ended 20% is the main reason many people buy a Medigap policy. The table below shows common Part B services.
| Service Category | Examples | Typical Cost Sharing |
|---|---|---|
| Doctor services | Office visits, specialists, surgeon fees | 20% after deductible |
| Outpatient care | ER visits, outpatient surgery, observation stays | 20% after deductible |
| Preventive services | Annual wellness visit, flu and COVID-19 shots, mammograms, colonoscopies | Often $0 if provider accepts assignment |
| Durable medical equipment | Walkers, wheelchairs, oxygen, CPAP machines | 20% after deductible |
| Diagnostic tests | X-rays, MRIs, CT scans, lab work | Lab tests often $0; imaging 20% |
| Mental health care | Outpatient therapy, depression screening, telehealth counseling | 20% after deductible; screening often $0 |
| Ambulance | Emergency transport when other transport is unsafe | 20% after deductible |
| Limited drugs | Infusions, some cancer drugs, insulin used with a pump | 20% after deductible |
Preventive care is a strong point of Part B. Medicare.gov lists dozens of covered screenings and vaccines. For example, a “Welcome to Medicare” preventive visit is available within your first 12 months of Part B. After that, you get a yearly wellness visit. Diabetes screenings, cardiovascular screenings, and lung cancer screenings are also included for those who meet the criteria.
What Is Not Covered and How to Fill the Gaps
The gaps in original medicare coverage matter as much as the benefits. Original Medicare generally does not cover routine dental care, dentures, routine eye exams, eyeglasses, or hearing aids. It does not pay for long-term custodial care, such as help with bathing and dressing in a nursing home. Care received outside the United States is covered only in rare situations. Most outpatient prescription drugs are not covered either. You need a separate Part D plan for those.
There are several ways to fill these gaps. Each one works differently.
- Medigap (Medicare Supplement): Sold by private insurers such as AARP/UnitedHealthcare, Mutual of Omaha, Aetna, Cigna, and Blue Cross plans. These policies help pay the 20% coinsurance, deductibles, and hospital coinsurance. Plan G is a popular choice for new enrollees.
- Part D drug plans: Standalone plans cover outpatient prescriptions. Costs vary by plan and by the drugs you take.
- Medicare Advantage (Part C): Plans from Humana, UnitedHealthcare, Aetna, and others replace Original Medicare. Many include dental, vision, and hearing benefits. However, they usually use provider networks and prior authorization.
- Medicaid and Medicare Savings Programs: People with limited income may get help with premiums and cost sharing through their state.
Timing matters when you choose. Your Initial Enrollment Period lasts 7 months. It starts 3 months before the month you turn 65 and ends 3 months after. If you delay Part B without other qualifying coverage, you may owe a late penalty of 10% for each full 12-month period you went without it.
That penalty usually lasts for life. Your best window for Medigap is the 6-month Medigap Open Enrollment Period. It begins the month you are 65 or older and enrolled in Part B. During that window, insurers cannot deny you or charge more for health conditions in most states.
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Take a few practical steps before you decide. First, list your doctors and confirm they accept Medicare assignment. Second, review your current prescriptions and compare Part D plans with the Medicare.gov Plan Finder. Third, estimate your likely hospital and outpatient use. Finally, contact your State Health Insurance Assistance Program (SHIP). SHIP counselors offer free, unbiased help in every state.
Frequently Asked Questions
Does original medicare coverage include prescription drugs?
Only in limited cases. Part A covers drugs you receive as a hospital inpatient. Part B covers certain drugs given in a doctor’s office, such as infusions and some injectables. For most pills you take at home, you need a separate Part D plan.
Is there an out-of-pocket maximum with Original Medicare?
No. Original Medicare has no yearly cap on what you pay. As a result, the 20% Part B coinsurance can add up quickly after a major illness. A Medigap policy or a Medicare Advantage plan can limit that exposure.
Can I see any doctor with Original Medicare?
Yes, you can see any doctor or hospital in the U.S. that accepts Medicare. There are no networks, and you do not need referrals to see specialists in most cases. That flexibility is one of the biggest advantages of original medicare coverage compared to many Advantage plans.
Does Medicare pay for nursing home care?
Part A pays for short-term skilled nursing care after a qualifying 3-day hospital stay, for up to 100 days. It does not pay for long-term custodial care. Typically, families rely on personal savings, long-term care insurance, or Medicaid for that type of care.
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Official Sources & Resources
For verified information on Medicare regulations and consumer protection:
- Medicare.gov (Official Site): medicare.gov
- CMS (Centers for Medicare & Medicaid Services): cms.gov
- NAIC (National Association of Insurance Commissioners): naic.org
- KFF Medicare Research: kff.org/medicare
- Social Security Administration: ssa.gov
Content last reviewed October 2026. If you notice any outdated information, please contact us.