According to the BBC and Dr Adam Fox, the funny abbreviations and slang doctors use on their medical notes is dying out.
The slang is usually a bit rude or derogatory towards the patient, such as NFN (Normal For Norfolk). Some of it is in questionable taste, like referring to the geriatric ward as the ‘departure lounge’.
That said, it is entertaining! This dialect, as it were, is on the way out due to the increase in lawsuits against doctors or in which they have to testify. It is very awkward for the doctor to explain to the Judge what the slang means. Can you imagine standing in court in front of your patient explaining that when you wrote ‘LOBNH’ on their notes, you meant ‘Lights On But Nobody Home’ ie. that the patient was very stupid?