ICD-10 Code E13.00 – Other specified diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC) (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E13.00 – Other specified diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC)
What it is
This code identifies other specified diabetes mellitus with hyperosmolarity, but without documented nonketotic hyperglycemic-hyperosmolar coma. Use it when the record shows hyperosmolarity in a patient with a nonstandard diabetes type.
Clinical signs
Clinical features vary; refer to documentation. Hyperosmolar states are typically associated with marked dehydration, altered mental status, and severe hyperglycemia, but coma is not present in this code.
When to use this code
Use E13.00 when the provider documents other specified diabetes mellitus and explicitly links it to hyperosmolarity, without stating coma. It may apply during an acute hyperosmolar episode or when hyperosmolarity is the reason for evaluation. Check documentation if the diabetes type is unclear or if coma is mentioned.
Do not use for
Do not use this code if the record documents nonketotic hyperglycemic-hyperosmolar coma, because a different code applies. Do not assign it for unspecified diabetes or for hyperosmolarity without a clear provider link to diabetes.
Coding tip
Confirm both the diabetes category and the absence of coma in the note before assigning E13.00.