• M.B.B.S. All India Institute of Medical Sciences , 1978
• M.S. (Gen. Surgery ) All India Institute of Medical Sciences , 1981
• M.Ch. (CTVS) All India Institute of Medical Sciences , 1984
• Fellowship( Neonatal cardiac surgery) Royal Children's Hospital, Melbourne ,1989.
Dr. Iyer has won many awards. Some of these are the Institute Gold Medal for Best Graduate of the year at MBBS examination, Sorel Catherine Friemna Prize for proficiency in Paediatrics, Pfizer Postgraduate Medical Award, Gold Medal and Scroll of Honour, Hira Lal Gold Medal for being the best postgraduate in General Surgery. He was awarded the Doppler award for best paper at the Sixth International Symposium on Echocardiography in Cardiac Surgery held in Washington D.C. in 1994