By james art The Free Narges Coalition said in a statement that Ms. Mohammadi should be placed on medical leave to receive comprehensive treatment for multiple ailments.
It said transferring her to hospital alone would not solve the severe health problems caused by months of neglect and deprivation.
Ms. Mohammadi, 52, is being held in Iran’s Evin prison, which houses political prisoners and those with Western ties. She was already serving a 30-month sentence, to which another 15 months were added in January.
On Saturday, Iranian authorities issued an additional six-month sentence against her after she organized a protest against the execution of another political prisoner in the women’s section of Evin prison on August 6.
Ms Mohammadi suffers from a heart condition and according to her medical report issued in September, the main artery of her heart has again developed a serious complication.
The coalition said it continues to press for Ms. Mohammadi’s unconditional release and her full access to medical care.
Ms Mohammadi is the 19th woman to win the Nobel Peace Prize and the second Iranian since human rights activist Shirin Ebadi in 2003.
Ms. Mohammadi has maintained her activism despite numerous arrests by the Iranian authorities and years behind bars.