Hyponatremia of newborn

This code represents a condition in a newborn characterized by abnormally low levels of sodium in the blood. This electrolyte imbalance can lead to various neurological and systemic complications if not promptly addressed. It is distinct from hyponatremia occurring in older pediatric or adult populations.

Use this code when documentation clearly indicates a diagnosis of hyponatremia specifically identified in a newborn patient (0-28 days of life). Supporting documentation should include laboratory results confirming serum sodium levels below the normal range for neonates, along with clinical signs and symptoms consistent with hyponatremia.

• Always confirm the patient's age to ensure they meet the newborn criteria (0-28 days).
• Distinguish from other forms of hyponatremia (e.g., P74.21 for transient neonatal hyponatremia due to maternal hyponatremia).
• Code any underlying cause of the newborn's hyponatremia, if known and documented, as an additional diagnosis.