Congenital iodine-deficiency syndrome, myxedematous type

This code represents a severe form of congenital hypothyroidism resulting from maternal iodine deficiency, characterized by significant physical and mental developmental delays. Individuals typically present with features of myxedema, including coarse facial features, macroglossia, umbilical hernia, and stunted growth. The condition is present at birth and impacts multiple organ systems due to inadequate thyroid hormone production.

Use this code for newborns or infants diagnosed with congenital hypothyroidism specifically attributed to iodine deficiency, presenting with the characteristic myxedematous clinical picture. Documentation should clearly state the congenital nature of the condition, evidence of iodine deficiency (maternal history, neonatal screening results), and the presence of myxedematous features.

• Differentiate from other forms of congenital hypothyroidism (e.g., due to thyroid dysgenesis or dyshormonogenesis) which have distinct codes.
• Ensure documentation explicitly links the hypothyroidism to iodine deficiency and describes myxedematous characteristics.
• Consider sequencing with codes for associated intellectual disabilities or other congenital anomalies if present and documented.