The RJD chief is admitted under the care of Dr Ramakanta Panda, VC and MD, Asian Heart Institute.
Panda was a part of the team of doctors that performed a bypass surgery on former prime minister Manmohan Singh in the past.
Sources said that Prasad was busy in the election preparations and hence was unable to come earlier.
Hospital spokesperson denied that Prasad required a heart valve replacement surgery. Meanwhile, Prasad’s wife, daughter and son-in-law are at the hospital.