ICD-10 Code E11.1 – Type 2 diabetes mellitus with ketoacidosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E11.1 – Type 2 diabetes mellitus with ketoacidosis
What it is
E11.1 identifies type 2 diabetes mellitus complicated by ketoacidosis. Use it when the record shows diabetic ketoacidosis in a patient with type 2 diabetes.
Clinical signs
Clinical features vary; refer to documentation. Commonly, the chart may describe dehydration, nausea, vomiting, abdominal pain, rapid breathing, confusion, or laboratory evidence supporting ketoacidosis.
When to use this code
Use E11.1 when the provider documents type 2 diabetes with ketoacidosis, including diabetic ketoacidosis. Assign it when the condition is clearly linked to type 2 diabetes in the note or discharge summary.
If the documentation only says diabetes with ketosis, acidosis, or hyperglycemia without ketoacidosis, check documentation before coding. You should not assume DKA unless the record supports it.
Do not use for
Do not use this code for type 1 diabetes with ketoacidosis or for uncomplicated type 2 diabetes. Check documentation if the record describes another diabetic complication instead.
Coding tip
Confirm that the provider explicitly connects ketoacidosis to type 2 diabetes before assigning E11.1.