Naidu, 68, who underwent angioplasty at the All India Institute of Medical Sciences (AIIMS) in Delhi.
Stalin, also the leader of opposition in Tamil Nadu Assembly, spoke to Naidu over the phone and enquired about his health, a release from the DMK leader's office said.
Naidu asked Stalin about the health of his father and DMK chief M Karunanidhi who had recently made a public appearance after an year-long confinement at home due to illness.