ICD-10 Code E10.65 – Type 1 diabetes mellitus with hyperglycemia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E10.65 – Type 1 diabetes mellitus with hyperglycemia
What it is
E10.65 identifies type 1 diabetes mellitus when the record documents hyperglycemia. Use it for insulin-dependent diabetes with elevated blood glucose, not for diabetes without a stated complication.
Clinical signs
Typical findings include documented high blood glucose and symptoms consistent with poor glycemic control, such as polyuria, polydipsia, or fatigue. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider states type 1 diabetes with hyperglycemia, or clearly documents uncontrolled blood sugar in a patient with type 1 diabetes. It applies when hyperglycemia is the relevant complication being addressed. If the record only says diabetes without complication, do not default to E10.65.
Do not use for
Do not use E10.65 for type 2 diabetes, gestational diabetes, or diabetes with hypoglycemia. Check documentation if the note does not clearly link hyperglycemia to type 1 diabetes.
Coding tip
Confirm that both type 1 diabetes and hyperglycemia are documented together before assigning E10.65.