ICD-10 Code E83.40 – Disorders of magnesium metabolism, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E83.40 – Disorders of magnesium metabolism, unspecified
What it is
E83.40 identifies a disorder of magnesium metabolism when the record does not specify the exact type. Use it when documentation states a magnesium metabolism disorder but gives no further detail.
Clinical signs
Clinical features vary; refer to documentation. Magnesium-related disorders may be associated with abnormal magnesium status or nonspecific neuromuscular or cardiac findings, but the chart must support the diagnosis.
When to use this code
Use this code when the provider documents a magnesium metabolism disorder without naming hypomagnesemia, hypermagnesemia, or another specific condition. It is also appropriate when the note confirms a disorder of magnesium metabolism but lacks enough detail for a more specific code.
Do not use for
Do not use E83.40 if the record clearly identifies a different magnesium-related diagnosis. Check documentation if the issue is only a lab abnormality or if the provider has not confirmed a metabolic disorder.
Coding tip
Code the most specific magnesium diagnosis available; if the documentation is vague, query for clarification before assigning E83.40.