Adj Asst Prof Er Chaozer

Dr Er is a Senior Consultant in Internal Medicine at Singapore General Hospital (SGH). He completed Internal Medicine Residency (2014) and Advanced Internal Medicine (AIM) Senior Residency (2016) under National Healthcare Group (NHG), followed by a venous thromboembolism (VTE) fellowship at St Thomas' Hospital, London. He subsequently continued his practice within NHG at Woodlands Health (WH) before transitioning to SGH in February 2026.

Dr Er is committed to medical education, serving as Adjunct Assistant Professor at Yong Loo Lin School of Medicine, National University of Singapore (NUS) and Adjunct Lecturer at Lee Kong Chian School of Medicine, Nanyang Technological University (NTU). He is a question setter/examiner for the national Advanced Internal Medicine (AIM) Exit Exam and faculty for the NUS Collaborative Prescribing Programme. He has received multiple Teaching Excellence Awards.

Dr Er believes strongly in delivering patient-centred, value-based care, where clinical decisions are guided not only by evidence but also by patients’ goals, preferences and long-term outcomes.

• Physician Faculty, PGY1 Programme

• Best Speaker Prize, Singapore Medicine Review Course, 2025
• Teaching Award for Senior Doctors, NHG Health, 2025
• Special Recognition Award, NUS, 2025
• Commendation Medal, National Awards (COVID-19), 2023
• Dean’s Award for Teaching Excellence, NUS, 2023
• Teaching Excellence Award (undergraduate), Yishun Health, 2023
• Ten-year Long Service Award, NHG Health, 2022
• Dean’s Award for Teaching Excellence, NUS, 2021
• Young Achiever Award, NHG Health, 2021
• Teaching Excellence Award (undergraduate), Yishun Health, 2019

1. Cohen AT, Welsh RC, Leentjens J, Canbay A, Choudhuri S, Er C, Chai-Adisaksopha C, Dover DC, Smits E, Mamza JB, Gao H, Zhang R, Randhawa AK, Beekman W, Scherg F, Palacios B, Godfrey G, Lang E, Arenillas J, Coleman CI; AXIOM Research Group. Incidence and outcomes of major bleeding among first-time oral factor Xa inhibitor users: multinational observational cohort studies. Res Pract Thromb Haemost. 2026 Jan 13;10(2):103351. doi: 10.1016/j.rpth.2026.103351. PMID: 41847413; PMCID: PMC12990360.
2. Hwang EJY, Yong E, Fan BE, Lo ZJ, Ong MW, Goo JT, Teo LT, Er C, Yong E, Venous thromboembolism risk assessment and thromboprophylaxis practice in nonorthopedic hospitalized surgical patients: A Singapore’s perspective. Part 3: Is the rate of Asian VTE as low as perceived? Int J Angiol. 2025.
3. Cohen A, Er C, Mamza JB, et al. Incidence and risk factors for mortality after major bleeding in patients on factor Xa inhibitors (AXIOM UK). Eur Heart J. 2024.
4. Cohen AT, Creeper KJ, Alikhan R, Er C, Connors JM, Huisman MV, Munoz A, Vescovo G, Bauersachs R, Ageno W, Agnelli G, Becattini C. Early Time Courses of Recurrent Venous Thromboembolism and Bleeding during Apixaban or Dalteparin Therapy for Patients with Cancer. Thromb Haemost. 2024 Jul;124(7):676-683.
5. Er C, Srinivasan S, Veerappan B, Adamjee T. Efficacy and safety of catheter-directed treatment in intermediate-risk pulmonary embolism: a single-centre experience in Singapore. Singapore Med J. 2023 Oct 5.
6. Er C, Ageno W, Cohen AT. Venous thromboembolism: prophylaxis and treatment. In: ESC Textbook of Thrombosis. 2023.
7. Er C, Breen K, Cohen AT. Nitrous oxide misuse: a clue not to be missed in young patients with venous thromboembolism. Clin Med (Lond). 2023 Mar;23(2):170-172.
8. Er C, Cohen AT. Limitations of venous thromboembolism risk assessment models in medical patients: Response to "Unmet definitions in thromboprophylaxis for hospitalized medical patients: An appraisal for the need of recommendation". Res Pract Thromb Haemost. 2023 Feb 15;7(1):100027.
9. Er C, Tan JY, Tan CW, Kaur H, Cheong MA, Lee LH, Ng HJ. "Lockdown-thrombosis"-an unexpected problem of the COVID-19 pandemic? J Thromb Thrombolysis. 2022 Jul;54(1):29-32.
10. Er C, Kuthiah N, Adamjee T, Tay JC. Venous Thromboembolism Risk Assessment and Thromboprophylaxis Practice in General Medical Patients Requiring Admissions to General Wards: A Singapore's Perspective. Int J Angiol. 2021 May 11;30(4):299-304.