ICD-10 Code E83.41 – Hypermagnesemia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E83.41 – Hypermagnesemia
What it is
Hypermagnesemia means an abnormally high level of magnesium in the blood. Use this code when the record documents excess magnesium, usually tied to impaired excretion or magnesium exposure.
Clinical signs
Clinical features vary; refer to documentation. Patients may have weakness, decreased reflexes, drowsiness, or more severe neuromuscular and cardiac effects when magnesium excess is significant.
When to use this code
Use E83.41 when the clinician documents hypermagnesemia as a diagnosis, assessment, or discharge problem. It may also apply when the note clearly links the condition to renal impairment, supplementation, or another stated cause. Code the documented condition, not the lab result alone.
Do not use for
Do not use this code for normal magnesium findings or for nonspecific electrolyte monitoring without a documented diagnosis. Check documentation if the chart only mentions magnesium supplementation or a possible abnormal result.
Coding tip
Confirm that hypermagnesemia is explicitly documented, then look for the stated cause and code it separately when supported.