I always accompany my wife to her doctors appointments, at her insistence.
This is basically for two reasons, to ensure her safety and cumfort as often she does not know which doctor she will see an it will very likely be a complete stranger.
Secondly to be a second ' Set of Ears' as especially when she is not feeling well she likes having me there to listen to what the doctor advises for her treatment, ask any questions she might have forgotten and reminder what medicines to take, how often etc when we get home.
If any doctor tried to refuse her the right to have me present she would immediately leave and take her business and that of the rest of our family elsewhere.
The way I understand it from her, the female patient has the right to insist on having the chaperone of their choice present during any examination, if a doctor tried to refuse my wife's clearly stated wishes in this mater, then serious alarm bells would would start ringing for my wife and she would have nothing further to do with that doctor.