E10.A2
Type 1 diabetes mellitus, presymptomatic, Stage 2
This code does not map to a risk-adjusting HCC in the loaded models.
Coding notes
Excludes 1 never coded together · Excludes 2 may co-exist
Confirmed islet autoimmunity with dysglycemia
Early-stage type 1 diabetes mellitus
brittle diabetes (mellitus) diabetes (mellitus) due to autoimmune process diabetes (mellitus) due to immune mediated pancreatic islet beta-cell destruction idiopathic diabetes (mellitus) juvenile onset diabetes (mellitus) ketosis-prone diabetes (mellitus)
diabetes mellitus due to underlying condition (E08.-) drug or chemical induced diabetes mellitus (E09.-) gestational diabetes (O24.4-) hyperglycemia NOS (R73.9) neonatal diabetes mellitus (P70.2) postpancreatectomy diabetes mellitus (E13.-) postprocedural diabetes mellitus (E13.-) secondary diabetes mellitus NEC (E13.-) type 2 diabetes mellitus (E11.-)
transitory endocrine and metabolic disorders specific to newborn (P70-P74)
Official Guidelines for E10.A2
FY 2026 ›Subsections
Sections that reference E10.A2
- I.C.4.a.1)(a)Presymptomatic Type 1 Diabetes Mellitus
Codes E10.A-, Type 1 diabetes mellitus, presymptomatic, are assigned for early-stage type 1 diabetes that predates the onset of symptoms.
- I.C.4.aDiabetes mellitus
… Assign as many codes from categories E08 – E13 as needed to identify all of the associated conditions that the patient has.
- I.C.15.gDiabetes mellitus in pregnancyChapter 15
… O24, Diabetes mellitus in pregnancy, childbirth, and the puerperium, first, followed by the appropriate diabetes code(s) (E08-E13) from Chapter 4.
Sections whose FY 2026 text names E10.A2, its E10 category, or a range containing it — the chapter guidance above is the authoritative source.
Find E10.A2 in the alphabetic index
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