We developed a logistic regression model using clinical data from an unselected cohort of 1021 Chinese with young‐onset (age at diagnosis ≤ 40) non‐type 1 diabetes enrolled in the Hong Kong Diabetes Register, 1.9% (n = 19) of whom had MODY (GCK‐, HNF1A‐, HNF4A‐ and HNF1B‐MODY) by molecular confirmation. The gene discussed is HNF1B; the disease is diabetes mellitus.