ICD-10 Code E87.0 – Hyperosmolality and hypernatremia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E87.0 – Hyperosmolality and hypernatremia
What it is
E87.0 identifies a disorder of body fluid balance involving increased serum osmolality and elevated sodium concentration. Use it when the record documents hyperosmolality, hypernatremia, or both.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include dehydration, thirst, altered mental status, weakness, or neurologic changes when sodium imbalance affects the brain.
When to use this code
Use E87.0 when the provider documents hypernatremia, hyperosmolality, or a related electrolyte disturbance as the diagnosis being treated or evaluated. It may also apply when the condition is confirmed during inpatient or outpatient assessment and is not better explained by another coded disorder.
Do not use for
Do not use this code for normal sodium variation, dehydration alone, or unspecified electrolyte problems without documented hypernatremia or hyperosmolality. Check documentation if the chart only mentions abnormal labs without a diagnosis.
Coding tip
Code the condition only when the provider clearly links the abnormality to hyperosmolality or hypernatremia in the assessment.