I have been asked by a possible employer to research DME billing and coding as well as outpatient therapy billing and coding. I have one small problem. I went to school for basic medical billing and coding and did my internship in a dental office. Can anyone please give me links, advice or answers as to figure out what these topics are and how I can go about doing them (i.e. how they differ from basic coding and billing) Are these harder to learn too?