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Dr Ong

Dr Ong

MBBS (Singapore), MRCPsych (UK)

Associate Consultant

Specialty: Psychological Medicine

Sub-specialties: General Psychiatry

Conditions Treated by this Doctor:
Addiction Disorders, General Psychiatry, Narcolepsy​, Sleep Disorders.

Clinical Appointments

  • Associate Consultant Psychological Medicine Changi General HospitalChangi General Hospital


Dr Hatta Santoso Ong is an associate consultant with the Department of Psychological Medicine at Changi General Hospital (CGH). He treats patients with mood and anxiety disorders, psychotic disorders, sleep disorders and addiction disorders. He is also part of the consult-liaison psychiatry team which treats mental disorders in patients with concomitant medical illnesses.

Dr Ong received his MBBS from the Yong Loo Lin School of Medicine at the National University of Singapore (NUS) in 2011. He obtained his MRCPsych (UK) qualification from the Royal College of Psychiatrists in 2016 before subsequently completing his postgraduate training in psychiatry under the Residency Program.


  • 2016 - MRCPsych (UK)
  • 2011 - MBBS (Singapore)

Professional Appointments and Committee Memberships

  • Associate Consultant - Department of Psychological Medicine, Changi General Hospital, 2020 – Present


  • 2017 - Best poster award in The 17th International Forum on Mood and Anxiety Disorders (IFMAD)

Research Interests


How to critically appraise and apply meta‐analyses in clinical practice. Ho RC, Ong HS, Kudva KG, Cheung MW, Mak A. Int J Rheum Dis. 2010 Oct;13(4):294-9.

Research Trials