You are doing the right thing. You can read FTC's advice and precautionary warnings about Medical Billing Business Opportunities at http://www.ftc.gov/bcp/conline/pubs/invest/medbill.htm 

To check out legitimate companies in this industry you can visit www.google.com  or specifically
http://www.google.com/search?q=medical+billing&btnG=Google+Search 

Good luck!

About the PowerHomeBiz.com Guide: 

Nach Maravilla is the Publisher of Power Homebiz Guides. He has over thirty years experience in sales and marketing of various products, which covered as he jokingly describes, "from toothpicks to airplanes"  He also had extensive experience in International trading and he always excelled in special promotional ideas for  retail outlets. 

The opinions expressed in this column are those of the author, not of PowerHomeBiz.com. Users should not treat the Guide's response as legal, accounting, or professional advice as all answers are intended to be general in nature. Such advice can only be properly given by qualified professionals who are fully aware of a user's specific geographical areas or circumstances, such as an attorney or accountant.