S.M.
I don't know much about billing/coding programs, but I do know a lot about going to school and doing my research. I don't know what your school experience is, but I am assuming that you are starting from scratch. You know that you want to do online here are a few tips
Just like brick & mortar schools, online schools vary a great deal. Some require regular meetings (online or in person). Some are term v. semester. Some are self-paced others still follow deadlines. As a military spouse you need to figure out how long it should take you to complete the program compared to how long your husband is expected to stay where he is at. If you know there is chance you will be moving soon look at schools that go where you go. CTC is one of them most bases have a Central Texas Advisore on post.
You should think about what exactly do you want as far as class scheduling goes. What can you handle. Many people I know fail a distance class the first time because they don't realize the amount of self-discipline it takes to read/watch lectures. This is probably the most important. What do you want and what are you capable of doing? Take this to the counselor and find what best fits into that plan.
Goodluck
dont forget to ask about tuition assistance and scholarships. There are a few available exclusively to mil spouses.