The difference is that at home you are responsible for what is put in. In an office setting you have higher ups that have to answer for what is produced. In a office it is pretty cut and dry because there is literature and specific procedures to follow. It isn't so much at home and the blame is placed on the biller and not the institution.
Transcription and medical coding are totally different. Transcription is word for word what the doctor says. Medical coding is partially the billers perspective of what is happening. Billing is tricky and coding is worse. I have been doing this for the past 8 years and I am currently in school to get my degree in medical billing and coding.