One neat aspect of medical coding is for relatively little formal education you can make a very good living if you are motivated. Although the average salary for a credentialed medical coder is around 48,000 per year. There is a variety of things that can influence your salary such as time on the job, location, and the specialty you work in.
From personal experience I know many coders how make a wide variety of incomes from 15 dollars an hour up to hundreds of thousands a year. The potential for a great living is definitely there for those willing to work hard at it.