ICD-10 Code E08.65 – Diabetes mellitus due to underlying condition with hyperglycemia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E08.65 – Diabetes mellitus due to underlying condition with hyperglycemia
What it is
This code identifies diabetes caused by another underlying condition, with documented hyperglycemia. Use it when the record shows both the secondary diabetes and elevated blood glucose related to that condition.
Clinical signs
Clinical features vary; refer to documentation. Common findings include persistent hyperglycemia, glucosuria, and other diabetes-related symptoms when they are recorded, but the key requirement is documented diabetes with hyperglycemia.
When to use this code
Use E08.65 when the provider states diabetes is due to an underlying condition and also documents hyperglycemia. The underlying cause should be identified in the chart, such as another disease or disorder linked to the diabetes. If the record does not clearly connect the diabetes to the cause, check documentation.
Do not use for
Do not use this code for diabetes without hyperglycemia, or for primary diabetes mellitus. Also avoid it if the chart does not support an underlying condition causing the diabetes.
Coding tip
Always code the underlying condition first when the record supports secondary diabetes.