Medicare Part B insurance helps pay for a variety of medically necessary doctor's care — that is, doctor's care for an illness or medical condition. This includes services like doctor’s office visits, care in hospitals and clinics when you are not admitted for an inpatient stay, laboratory tests and some diagnostic screenings, and some skilled nursing care at home, if you’re homebound.
Part B also covers most doctor services you receive as a hospital inpatient. Part B is voluntary, but most people sign up when they first become eligible. Part B is making it easier to get preventive care. It now covers an annual wellness exam plus additional preventive screenings at no cost to you. Part B offers the same benefits throughout the United States. You are not limited to a particular state or region for your care.