ICD-10 Code E86.0 – Dehydration (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E86.0 – Dehydration
What it is
E86.0 identifies dehydration, a condition where the body has lost more fluid than it has taken in. It is used when the record clearly documents dehydration, with or without a stated cause.
Clinical signs
Clinical features vary; refer to documentation. Common findings include dry mucous membranes, thirst, decreased skin turgor, reduced urine output, and signs of volume depletion. In older adults, confusion or weakness may also be noted.
When to use this code
Use E86.0 when the provider documents dehydration as a diagnosis, assessment, or discharge condition. It fits cases caused by poor intake, fluid loss, or intercurrent illness when dehydration is specifically named. If the chart only describes fluid imbalance, check documentation before assigning this code.
Do not use for
Do not use E86.0 for simple thirst, minor fluid restriction, or suspected dehydration without provider confirmation. If another condition is documented as the primary problem, code that condition instead and verify whether dehydration is also reported.
Coding tip
Assign E86.0 only when dehydration is explicitly documented and supported by the note, not inferred from nonspecific symptoms alone.