I worked for a medical coding software company and was actually taking classes there to get certified. I understand you can make good money and can work from home and contract easily. The profession is dominantly female and traditionally not very foward in technology(but that's sort of common in the medical field in general) but of course that's changing.
Personally it's boring to me but if you don't mind it, it seems like a good thing to get into and especially if you are good at it. It seems like there is a demand for good coders as most are just average.