ICD-10 Code E87.5 – Hyperkalemia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E87.5 – Hyperkalemia
What it is
Hyperkalemia means an abnormally high potassium level in the blood. It is a diagnosis code for the condition itself, not for a specific cause such as kidney disease or medication effect.
Clinical signs
Clinical features vary; refer to documentation. Patients may have weakness, paresthesia, or cardiac rhythm changes, and the diagnosis is often confirmed by laboratory testing and provider assessment.
When to use this code
Use E87.5 when the provider documents hyperkalemia, elevated potassium, or high serum potassium as an active diagnosis. Apply it for inpatient, outpatient, or emergency care when the condition is evaluated or managed. If the record only shows an abnormal lab without a diagnosis, check documentation.
Do not use for
Do not use this code for a history of hyperkalemia or for suspected but unconfirmed cases. Also avoid it when the chart documents only a lab result with no provider diagnosis.
Coding tip
Link E87.5 to the documented cause when the record supports it, such as renal failure or medication-related hyperkalemia.