Almost all care provided by hospitals is covered by Part A. This includes:

• A semi-private room (or a private room if it's medically necessary or if a semi-private room isn't available)
• Special care units (like intensive care and coronary care)
• Operating room charges
• Nursing services (though not private-duty nursing)
• Drugs, supplies, and appliances provided in and by the hospital
• Special treatments (like radiation and chemotherapy)
• Lab and diagnostic tests (like X-rays and CAT scans)
• Rehabilitation (physical, speech, and occupational therapy)

Remember, though, that being "covered" doesn't necessarily mean medical expenses will be fully paid. Most participants will still have significant hospital costs that Part A doesn't pay.