ICD-10 Code E11.0 – Type 2 diabetes mellitus with hyperosmolarity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E11.0 – Type 2 diabetes mellitus with hyperosmolarity
What it is
This code identifies type 2 diabetes mellitus complicated by hyperosmolarity, a serious metabolic state caused by severe dehydration and very high blood glucose. Use it when the record links type 2 diabetes to hyperosmolarity.
Clinical signs
Patients may have marked dehydration, altered mental status, weakness, and signs of severe hyperglycemia. Clinical features vary; refer to documentation.
When to use this code
Use E11.0 when the provider documents type 2 diabetes with hyperosmolarity or a hyperosmolar hyperglycemic state tied to type 2 diabetes. Code the condition from the clinician’s diagnosis, not from suspicion alone. Check documentation for any associated coma or other complications.
Do not use for
Do not use this code for type 1 diabetes, gestational diabetes, or hyperglycemia without documented hyperosmolarity. Do not apply it when the record only says dehydration or uncontrolled diabetes.
Coding tip
Confirm that hyperosmolarity is explicitly documented and that the diabetes type is type 2 before assigning E11.0.