ICD-10 Code E10.A0 – Type 1 diabetes mellitus, presymptomatic, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E10.A0 – Type 1 diabetes mellitus, presymptomatic, unspecified
What it is
This code identifies presymptomatic type 1 diabetes mellitus when the record does not specify a more detailed subtype. It indicates autoimmune diabetes risk or early disease before classic symptoms are documented.
Clinical signs
Clinical features vary; refer to documentation. You may see laboratory or immunologic evidence of type 1 diabetes risk, but the patient may not yet have overt hyperglycemia or typical symptomatic diabetes.
When to use this code
Use this code when the provider documents presymptomatic type 1 diabetes mellitus and does not name a more specific form. It fits encounters focused on early recognition, risk assessment, or monitoring of documented presymptomatic disease. Check documentation if the note only says diabetes risk or family history.
Do not use for
Do not use it for established symptomatic type 1 diabetes, type 2 diabetes, or unspecified diabetes without presymptomatic documentation. Also avoid it when the chart only mentions screening, observation, or suspected disease.
Coding tip
Code only when the provider clearly states presymptomatic type 1 diabetes; if the wording is vague, check documentation before assigning E10.A0.