Describe the differences between Medicare Parts A, B, C and D

Part A: Hospital Insurance
Part B: Medical Insurance

Part C: Medicare Advantage

Part D: Prescription Drug Coverage.

Part A helps pay for hospital inpatient care, some home health care, skilled nursing care, and hospice care.
Part B provides coverage for physician services, hospital outpatient services, some home health care, medical equipment and supplies, and other health services.
With Part C, or Medicare Advantage, the beneficiary purchases a health insurance plan offered by one of the private companies approved by Medicare. These plans may offer coverage for services excluded by Parts A and B, but the premiums, out-of-pocket expenses, and rules for coverage vary by plan. Under Part C, beneficiaries pay a monthly premium for the insurance plan, in addition to their Part B premium.?
Part D, created by the Medicare Prescription Drug, Improvement, and Modernization Act of 2003 (MMA), is optional insurance coverage available to all Medicare beneficiaries that is designed to lower prescription drug costs. Medicare beneficiaries pay a monthly premium for the Parts B and D benefits, but not for Part A. Beneficiaries may opt to purchase a managed care plan to provide their health care services and prescription drugs.