I think you have a misunderstanding about how reference material works. Doctors have been using software to help them identify medical problems at least since the 80's. They also keep large collections of medical books to reference. If they're still having trouble they will speak to colleagues to gain a better understanding. The human body is amazingly complex. You cannot expect any single human (even a highly educated doctor) to know more then the basics, and then a small subset of additional information about it.
Just as a FYI, WebMD was built of off the expert system software that your doctor has been using for ages.