What is Medicare? Who is eligible to be covered?What are these different Parts (A,

What is Medicare? Who is eligible to be covered?
What are these different Parts (A, B, C, and D) of Medicare? What are the differences between the parts? What services are covered? Does everyone automatically get coverage under these parts? What is the cost to the individual enrollee?
Given the parents’ medical conditions, do they need Parts A, B, and D?
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