Is it imagination, or is the Doctor here, we do not know his number because he doesn’t wear one, appear to be somewhat startled, even shocked by the sight of this patient?
Perhaps this Doctor doesn't have anything to do with human medical experimentation at the hospital, or with the aversion therapy programme. Capable only of carrying out the basic medical examination, and even then he has to feed his diagnosis of the Prisoner’s medical examination into a computer in order to gain the result. Which is strange, because all the doctor did was check his heart. Not his blood pressure, or pulse etc, etc. The doctor waited a few moments, and machine said the patient is absolutely fit!
Be seeing you