Dr. Chiah did his basic medical degree at Universiti Kebangsaan Malaysia. He later obtained his postgraduate qualification from the Royal College of Paediatrics and Child Health, United Kingdom.
Dr. Chiah started his paediatric training at Hospital Kangar. Subsequently, he served at Hospital Seberang Jaya. He has experience in managing a wide range of paediatric illnesses. He received an Excellence Service Award in 2004 from the Ministry of Health.
Dr. Chiah has experience in looking after premature babies, including those requiring intensive care and ventilation. He keeps himself up-to-date by attending courses and conferences.
Dr. Chiah continued to improve his medical knowledge by taking an interest in dermatology and getting his Graduate Diploma in Family Practice Dermatology from National University of Singapore in 2011.