ICD-10-CM > E00-E89 > E08-E13 > E10 > E10.A E10.A Type 1 diabetes mellitus, presymptomatic Non-Billable/Non-Specific Applicable To Early-stage type 1 diabetes mellitus Codes E10.A0Type 1 diabetes mellitus, presymptomatic, unspecifiedE10.A1Type 1 diabetes mellitus, presymptomatic, Stage 1E10.A2Type 1 diabetes mellitus, presymptomatic, Stage 2