South Korea’s detailed classification system requires patients to register with the National Registration for Diabetes to receive reimbursement for consumable diabetes-related supplies.20 This system includes specific criteria, such as low C-peptide levels, a history of DKA, or positive test results for autoantibodies, along with ICD-10 code E10 and insulin prescription to classify a patient as having T1D.21 This comprehensive system helps minimize misclassification. This evidence concerns the gene INS and type 1 diabetes mellitus.