I used to do medical billing/coding in the 1990's. It is a phased out position & doesn't have many opportunities in today's market. I used to earn an hourly rate + commission but I don't think they do this anymore either. Good Luck!!
Yes, I have a colleague who's a real pro, and I do a fair amount myself for my work, though I am not primarily a coder. We both work from home, though.
If you Google "coder list" you'll connect with whole online communities of them. They're interesting folks and would probably be happy to help you.