Q89: Other congenital malformations, not elsewhere classified
Q89.2: Congenital malformations of other endocrine glands

inclusionTerm
Congenital malformation of parathyroid or thyroid gland
Persistent thyroglossal duct
Thyroglossal cyst

excludes1
congenital goiter (E03.0)
congenital hypothyroidism (E03.1)

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