Neonatal thyrotoxicosis

This code represents a transient hyperthyroid state in a newborn, typically caused by the transplacental passage of maternal thyroid-stimulating immunoglobulins. It is characterized by symptoms such as tachycardia, irritability, poor weight gain, and goiter, and usually resolves within a few weeks or months as the maternal antibodies clear from the infant's system.

Use this code when a neonate presents with clinical signs and symptoms of hyperthyroidism, and diagnostic testing confirms elevated thyroid hormone levels. Documentation should clearly indicate the neonatal period and the transient nature of the thyrotoxicosis, often linked to maternal Graves' disease.

• Differentiate from congenital hyperthyroidism, which is a permanent condition.
• Ensure documentation specifies "neonatal" to support this specific code.
• Consider sequencing with codes for maternal conditions (e.g., Graves' disease) if relevant for the infant's record.