Rao, 83, was admitted to the Medanta Hospital with renal ailments.
"He breathed his last at 3:45 pm," his daughter Smita Prakash told IANS.
His funeral will be held on Monday at the Lodhi Road crematorium.
Union Information and Broadcasting Minister M.Venkaiah Naidu said Rammohan Rao's death was a huge loss.
"Shocked to learn about the demise of Sri Ram Mohan Rao Fmr PIO, PIB . A visionary in Govt communication, huge loss for IIS service. RIP," Naidu said in a tweet.
Frank Noronha, Director General of Press Information Bureau, also paid his tributes.
"I.Rammohan Rao, former PIO #PIB passes away. He was a legend and an inspiration to so many of us. Rest in peace, sir," Noronha tweeted.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)