Anophthalmos, microphthalmos and macrophthalmos (Q11)
The ICD-10 code Q11 series covers congenital conditions affecting eye size and development, including anophthalmos, microphthalmos, and macrophthalmos. These codes are used to classify specific malformations where one or both eyes are absent, abnormally small, or abnormally large.
The code Q11.0 identifies the cystic eyeball, also known as congenital cystic eyeball or congenital cyst of orbit, representing a rare congenital malformation. Code Q11.1 covers other forms of anophthalmos, which is the complete absence of ocular tissue, including cases described by synonyms such as SOX2 anophthalmia syndrome or bilateral anophthalmos. Q11.2 classifies microphthalmos, a condition of abnormally small eyes, linked with numerous syndromes like Delleman and Fryns syndrome; synonyms include microphthalmia and syndromic nanophthalmos. Lastly, Q11.3 refers to macrophthalmos, which denotes abnormally large eyes, sometimes associated with conditions like congenital coloboma of the optic disc or iris. Medical coders can rely on these ICD-10 codes to accurately document and distinguish these developmental eye disorders.
Clinical Terms
The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.
Anophthalmos
Congenital absence of the eye or eyes.
Choanal Atresia
A congenital abnormality that is characterized by a blocked CHOANAE, the opening between the nose and the NASOPHARYNX. Blockage can be unilateral or bilateral; bony or membranous.
Microphthalmos
Congenital or developmental anomaly in which the eyeballs are abnormally small.
