About 40 million people in the United States are covered by Medicare, mostly seniors. Medicare covers most of the cost of hospitalization and a lot of other medical care for older Americans, covering, all told, about 50 percent of medical costs for seniors. Nevertheless, Medicare doesn’t cover many services.
Medicare is divided into two parts: Part A and Part B. Part A covers mostly hospital expenses and follow up, while Part B partially pays for doctor and outpatient medical care.