>Who are the doctors 'currently' treating [RBG]?
According to a NYT article; https://www.nytimes.com/2018/12/21/health/ginsburg-cancer-lung.html
RBG was staying at the Memorial Sloan Kettering Cancer Center in New York City and two commenting Doctors, Raja Flores-chairman of thoracic surgery at the Icahn School of Medicine at Mount Sinai in Manhattan and Richard S. Lazzaro-cheif of thoracic surgery at Lenox Hill Hospital in Manhattan.
>What other political [former/current] sr. political heads are they affiliated w/?
No idea
>What 'off-market' drugs are being provided to [RBG] in order to sustain minimum daily function?
No idea
>What is the real medical diagnosis of [RBG]?
No idea
>Who is managing her care?
Possibly the two doctors in the linked article
>Who is 'really' managing her care?
No idea