This provides coverage for inpatient hospital care, skilled nursing facility care, hospice care, and some home health care services. Part A is generally available to most U.S. citizens and permanent residents who have worked and paid Medicare taxes for a certain number of quarters.

This covers medical services such as doctor's visits, outpatient care, preventive services, and some medical equipment. Part B is available to anyone who is eligible for Part A, and it requires payment of a monthly premium.

These are private health insurance plans that provide the same coverage as Original Medicare (Part A and Part B) but often include additional benefits, like prescription drug coverage (Part D), dental, vision, and hearing services. The availability of Medicare Advantage plans varies by location and insurance providers.

This provides prescription drug coverage. Part D plans are offered by private insurance companies, and the availability of specific plans can vary by location.

Medigap policies are private insurance plans that help cover the out-of-pocket costs associated with Original Medicare (Part A and Part B), such as copayments, deductibles, and coinsurance. Availability can vary by state and insurance companies.