A Medicare Supplement (Medigap) policy is health insurance sold by private insurance companies to fill the gaps in Original Medicare Plan coverage. Medigap policies help pay some of the health care costs that the Original Medicare Plan doesn't cover.
Internal Medicine encompasses the care of all adults, healthy and sick. Internists (as all doctors who complete an internal medicine residency are called) can be generalists or subspecialists, like cardiologists or rheumatologists. If you choose not to subspecialize, you are known as a General Internist.
Internists are often used to solve medical puzzles, since they are familiar with a wide range of medical conditions and their causes. Specialists in internal medicine treat people with all sorts of conditions, from hepatitis to cancer, and careers in internal medicine are incredibly varied.