ICD-10 Code E83.51 – Hypocalcemia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E83.51 – Hypocalcemia
What it is
Hypocalcemia means the calcium level in the blood is below normal. Use this code when documentation identifies low serum calcium or a clinical diagnosis of hypocalcemia.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include neuromuscular irritability, muscle cramps, paresthesias, tetany, or seizures in more severe cases.
When to use this code
Use E83.51 when the provider documents hypocalcemia as an active diagnosis or confirms low calcium requiring assessment. It also fits encounters for evaluation, monitoring, or follow-up of a documented calcium deficiency. If the record only mentions an abnormal lab without diagnosis, check documentation.
Do not use for
Do not use this code for hypercalcemia or for nonspecific electrolyte abnormalities without confirmed low calcium. If the chart does not support hypocalcemia, check documentation.
Coding tip
Code the condition only when the provider links the low calcium finding to hypocalcemia in the record.