Nolo's Plain-English Law Dictionary
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- A federal government program that assists older and some disabled people in paying their medical costs. The program is divided into three parts. Part A is called hospital insurance and covers most of the costs of a stay in the hospital, as well as some follow-up costs after time in the hospital. Part B, medical insurance, pays some of the cost of doctors and outpatient medical care. Part D pays for some of the cost for prescription medicine.