Maybe because people who are interested in medicine are naturally attracted to the culture? I read the books I have because I enjoy them, the fact that I enjoy medical literature (among many types) is more reflective of my enjoyment of the craft of medicine itself than because I believe it will help me on the interview trail.
Anyway.
The Scalpel's Edge is quite a bit different from the other books mentioned here, but as someone interested in one day being a surgeon, I found it interesting. It's actually written by a cultural anthropologist who spent time shadowing and studying surgeons to better understand the mindset and culture of those who spend their lives cutting people open. It's really more of an extended academic thesis, but I still found it quite accessible overall and, as some of the reviews mention, the chapter on operating room rituals was especially fascinating.