Diabetes Mellitus (DM) has been a major contributor to health burden in Indonesia and currently its burden still continues to rise. This is a result of increasing DM prevalence in the country as well as high rates of chronic complications from DM. Findings in Indonesia show that there is a high proportion of young people with diabetes, and also a high risk of therapeutic failure and complications from DM occurring in the younger population. Young-onset DM has a wide clinical spectrum, including autoimmune DM, polygenic DM, and monogenic DM such as Mature Onset Diabetes of the Young (MODY). Identification and proper diagnosis of young-onset DM spectrum is crucial to treatment outcomes, as certain spectrums, such as some subtypes of MODY, may benefit from cost-efficient alternatives with better outcomes. However, proper diagnosis of young-onset DM in Indonesia is still a great challenge, as currently some examinations, including genetic testing, has not yet been feasibly done in the country. With current advances in genomics, genetic testing may prove to be fundamental in providing optimal and personalized treatment and care for DM patients. This study is a pilot project aimed to initiate genomic research in young-onset DM patients in Indonesia. In the short term, this study aims to identify genetic variants that may be able to increase diagnostic accuracy of the young-onset DM spectrum. In the long term, this study aims to identify new genetic variants of young-onset DM. The study also aims to identify genetic variants associated with risks of chronic complications.