Agree with Thomas. My large healthcare organization has a document of unacceptable abbreviations for medical documentation. It might be just the JCAHO list on our letterhead, or they may have added others. I am not aware of a list of "approved" abbreviations. Particularly for office (not hospital) documentation, I have seen abbreviations all the time, and could vary a lot by specialty. The surgical consents for example do not use abbreviations, but in the note a gynecologist might use TAH for total abdominal hysterectomy, but a different specialty might use TAH in a different context. My very unofficial opinion is that as long as it is not on the unacceptable list, and the meaning is clear in context, then I would have no issue with abbreviations.