A fire broke out at the AIIMS in New Delhi on Saturday evening and 22 fire tenders were rushed to the site.
Dark plumes of smoke were seen billowing out from the top of the premier health institute.
There was no immediate report of anyone being injured in the blaze.
A Delhi Fire Services official said that they received a call around 5 pm and 22 fire tenders were immediately dispatched to contain it.
Former finance minister Arun Jaitley is admitted to the Intensive Care Unit (ICU) of the cardio-neuro centre, housed in a different building in the complex.