Metropolitan Magistrate 21st Court at City Sessions Court Arvind Mishra remanded Ghosh to judicial custody till December 3.
Main accused and Saradha Group chairman Sudipta Sen, his close associate Debjani Mukherjee were also remanded to judicial custody till December 3.
The court had earlier this month ordered a report from the correctional home authorities on Ghosh's health condition after he started a hunger strike on October 10 and on his allegation of being threatened with murder by co-prisoners.
Ghosh's mother too had filed an FIR earlier this week alleging that the jail authorities and other prisoners have been torturing her son and threatening to kill him.
In her complaint, she also named a couple of officials at the correctional home and urged that they be adequately punished.
Ghosh was arrested by on November 23, 2013 and taken in custody by CBI on September 4, 2014, after it took over investigation on an order by the Supreme Court.