ICD-10 Code E08.00 – Diabetes mellitus due to underlying condition with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC) (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E08.00 – Diabetes mellitus due to underlying condition with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC)
What it is
This code identifies diabetes caused by another underlying condition, with hyperosmolarity present but without documented nonketotic hyperglycemic-hyperosmolar coma. Use it when the record supports both the secondary diabetes and the hyperosmolar state.
Clinical signs
Clinical features may include severe dehydration, marked hyperglycemia, altered mental status, or other findings consistent with hyperosmolarity. Clinical features vary; refer to documentation.
When to use this code
Use E08.00 when the provider documents diabetes mellitus due to another condition and specifically notes hyperosmolarity without coma. This is appropriate when the underlying cause is identified and the diabetes complication is clearly stated. If coma is documented, choose the more specific code.
Do not use for
Do not use this code for type 1 or type 2 diabetes, or for hyperosmolarity without a documented secondary diabetes relationship. Check documentation if the record does not clearly state the underlying condition.
Coding tip
Always code the underlying condition first when documented, and verify whether coma is present before selecting E08.00.