ICD-10 Code E08.0 – Diabetes mellitus due to underlying condition with hyperosmolarity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E08.0 – Diabetes mellitus due to underlying condition with hyperosmolarity
What it is
This code identifies diabetes caused by another underlying condition when the diabetes is complicated by hyperosmolarity. Use it when the record links the diabetes to a secondary cause and documents the hyperosmolar state.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include severe dehydration, altered mental status, and marked hyperglycemia associated with hyperosmolarity.
When to use this code
Use E08.0 when the provider documents diabetes due to an underlying condition and specifically notes hyperosmolarity. The underlying condition must be identified in the chart, and the diabetes must be coded as secondary to it.
Apply this code for encounters where the hyperosmolar complication is part of the diagnosis, not merely suspected. If the record does not clearly connect the diabetes to the underlying condition, check documentation.
Do not use for
Do not use this code for primary diabetes mellitus or for diabetes without hyperosmolarity. Do not assign it when the chart lacks documentation of an underlying cause.
Coding tip
Always code the underlying condition first when documentation supports diabetes due to another disease.