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 have the training to provide an extensive range of diagnostic and treatment services that typically would have to be done by several different doctors. Internists complete a three year residency in internal medicine before going on to treat patients with a variety of medical conditions. Subspecialists in internal medicine complete the three year residency, and a two or three year fellowship in their area of interest.