Since 2004, A/Prof Koh has been actively involved in the education of medical students, nurses, allied health, house officers, medical officers, residents and senior residents. She has played an active role in enhancing the training programmes of the National Healthcare Group (NHG), Tan Tock Seng Hospital and the National University of Singapore Yong Loo Lin School of Medicine. She was the Programme Director for the NHG Internal Medicine Residency Programme at its inception in 2010 and launched the post-graduate Internal Medicine training programme, which achieved the best accreditation outcome nationally during her term from 2010 to 2014.  She joined LKC School of Medicine in 2015 as the Principal Lead for Medicine and developed the Medicine programme for the clinical years. She continues to be actively involved in post-graduate training and has remained as the Chair of the Programme Evaluation Committee for the NHG Internal Medicine Residency Programme. She is also an accreditor for specialist training programmes, under the Joint Committee on Specialist Training, Ministry of Health.