I am a certified professional coder. I work for the Department of Defense coding for military hospitals. I currently work from home.
Once you get into the field and really get a good background, you can find companies that allow you to work from home. I currently am a subcontractor, so I work when I want and as much as I want. It really is nice. The money is great and I can also travel if I want to.
I started out doing medical billing and don't like it as much because it just seems like a vicious cycle. My friend is also a coder and has recently been promoted to the billing supervisor where she works and she also doesn't care for it as much.
I don't know where you plan on getting your credentials, but please realize that there are only 2 nationally recognized licensing agencies. One is AHIMA and the other is the AAPC. Alot of "career colleges" will tell you that you will be certified when you graduate from their school, but you really aren't. You will be eligible to sit for the certification exam, but you will not be certified. The certification exam is a 5 hour test that you must pass.
I believe AHIMA and AAPC both offer at home/online study courses to prepare you to sit for your exam.
Check out their websites for more info.
Good luck to you.