There are 4 different parts of Medicare:
Original Medicare Part A helps cover inpatient hospital care, skilled nursing care, hospice care and home healthcare. Generally, if you have worked and paid Medicare taxes for the past 10 years, you don't pay a monthly premium for Original Medicare Part A.
Original Medicare Part B helps cover medical visits with doctors and other healthcare providers, outpatient care, home healthcare, durable medical equipment and some preventive services. Most participants pay a monthly premium for Original Medicare Part B.
Part C (also called Medicare Advantage) helps cover services provided for under Original Medicare Part A and Part B and may include prescription drug coverage (Part D). Part C is run by Medicare-approved private insurance companies.
Part D helps cover the cost of prescription drugs and may help lower the amount you pay for prescriptions. It's run by Medicare-approved private insurance companies.
Visit Medicare.gov for more information.