No casualty was reported in the incident, they said.
"More than 40 patients have been shifted to Metro's another hospital," Singh said.
Around 10 fire tenders were rushed to spot and the situation was brought under control, fire department officials said.
A policeman and a fire department official at the spot said the reason behind the incident was suspected to be due to short circuit.
Another police official said the fire broke out on the second floor of the hospital around noon.
The hospital authorities did not respond to repeated calls and text messages.
Staffers tried to help patients out of the building in Noida, a suburban town in Uttar Pradesh on the outskirts of the national capital.
Thick smoke could be seen billowing out of the building in Sector 12. People stood on ledges and on balconies as rescuers tried to reach them by smashing glass window panes.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)