Every internal medicine attending physician I know (along with all of the internal medicine resident I know) knows how to treat diabetes. I mean, how could they not, when 34.2 million Americans have it and everything from the basic pathophysiology of diabetes to treatment with oral antiglycemics and/or insulin is drilled into every medical student's head over the course of four years? Not to mention the fact that diagnosing and managing diabetes is the bread and butter of internal medicine (and arguably also family medicine). Sorry, but if you have no idea how to differentiate between rapid-acting and long-acting insulin and your idea of insulin adjustment is to just "go up on the units", you have absolutely no business being around anyone with diabetes, let alone trying to "practice" internal medicine.