But medicine once you get to application of drugs rather than anatomy (setting bones, surgery) crosses over into another domain: chemistry, and at it's lowest level chemistry in turn is physics. Doctors need to know how to diagnose an issue (which often involves other disciplines within medicine for instance radiology), and then what particular medication or procedure to prescribe to solve the problem. The implementation details of that medication are not that important until you get to side effects, akin to how a programmer might select a library to perform a certain function.