93-year-old Pijush Mukherjee, who stays in Birbhum, is suffering from septecaemia and had been hospitalised on Tuesday.
The President reached Durgapur by a Navy helicopter from Kolkata accompanied by his son Abhijit and daughter-in-law this afternoon, officials said.
He was at the hospital for an hour and also spoke to doctors, who told him that his brother's condition was now stable, hospital sources said.
After the visit, Mukherjee left in the chopper for Kolkata on way to Delhi.