With the health care industry growing rapidly, the demands on medical office staff are increasing and many doctors are outsourcing billing tasks to independent, medical billing professionals. Medical billing work from home is a sub-specialty of medical coding. As a medical billing specialist, you will need expertise in a wide range of areas including anatomy and physiology, insurance claim procedures and medical office administration. If you choose to specialize in medical billing careers you will be trained in standard procedures for filing an insurance claim. Many companies look for three to five years of experience before hiring someone to do medical billing work from home.