ICD-10 Code E11.01 – Type 2 diabetes mellitus with hyperosmolarity with coma (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E11.01 – Type 2 diabetes mellitus with hyperosmolarity with coma
What it is
This code identifies type 2 diabetes with a hyperosmolar state severe enough to cause coma. Use it when the record documents both hyperosmolarity and coma linked to diabetes.
Clinical signs
Typical findings include marked dehydration, altered mental status, and progression to coma in the setting of uncontrolled diabetes. Clinical features vary; refer to documentation.
When to use this code
Use E11.01 when the provider clearly documents type 2 diabetes with hyperosmolarity and coma. It may appear in emergency, inpatient, or transfer notes where the acute diabetic crisis is the reason for care.
Code it only when coma is attributed to the hyperosmolar diabetic state. If the chart mentions hyperosmolarity without coma, choose the more specific noncomatose code instead.
Do not use for
Do not use this code for diabetic ketoacidosis, hypoglycemia, or hyperosmolarity without coma. Check documentation if the mental status change is not clearly linked to diabetes.
Coding tip
Confirm that both hyperosmolarity and coma are documented together before assigning E11.01.