Pretty sure that was from Michael Moore's Sicko, as I own the movie and remember that story pretty vividly. I think getting his ring finger reattached cost him something like 12k. And yeah, he HAD insurance.
What pisses me off most about our healthcare system is that people can go bankrupt when they get sick. That shouldn't happen, ever. Nor should it be possible for health insurance companies to deny claims which can save lives. I support universal healthcare, but I'm sure that doesn't surprise anyone. I wish more people in the US did as well.