ICD-10 Code E10.A – Type 1 diabetes mellitus, presymptomatic (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E10.A – Type 1 diabetes mellitus, presymptomatic
What it is
Type 1 diabetes mellitus, presymptomatic, identifies early autoimmune disease before classic hyperglycemia appears. Use it when documentation shows presymptomatic type 1 diabetes, not established diabetes.
Clinical signs
Clinical features vary; refer to documentation. This code may be supported by evidence of autoimmune beta-cell activity or stated presymptomatic type 1 diabetes, without overt diabetic symptoms.
When to use this code
Use this code when the provider documents presymptomatic type 1 diabetes or an equivalent early-stage diagnosis. It fits patients under evaluation or surveillance for type 1 diabetes before symptomatic disease is present. Check documentation if the record only suggests risk or family history.
Do not use for
Do not use it for established type 1 diabetes with hyperglycemia or for type 2 diabetes. It is also incorrect for family history, screening, or nonspecific autoimmune markers alone.
Coding tip
Code only when the chart clearly states presymptomatic type 1 diabetes; otherwise, use the documented condition or ask for clarification.