Mental Health is definitely a good one to start with. Very few CPT and DX codes to learn. But even though it is fairly simple, the experience you have will help you with many other specialties. Each specialty has things that apply only to that specialty, but for the most part billing is billing. We also bill for quite a bit of mental health. We also bill for eye doctors, family practice, chiropractic, radiology, physical therapy. It's hard to say 'this specialty is good' or 'this specialty is not' because we have found that it really varies more by office, than specialty. Meaning, we have one chiropractic office that is very profitable, while another is a huge time sucker. Both are DCs but both run their offices very different. Overall I would say chiropractic is more work for the money because they get less money for a visit. Between $30-$50 per treatment as opposed to mental health which is $75-150 per treatment. They see more patients in an hour, but you have to bill four claims of chiropractic for one claim of mental health. We do find that eye doctors are pretty profitable, as well as doctors that visit skilled nursing facilities. I'm not sure if you are doing any psychiatrists. They are mental health but on the medical side and they are pretty good as well. That might be a good way to break more into the medical side since you may be able to get referrals from your current clients.