2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Congential Anomalies 740-759 > Chromosomal Anomalies 758.* >  2008 ICD-9-CM Diagnosis 758.33
Other microdeletions On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date.
The 2009 version of ICD-9-CM 758.33 can be accessed here. - A developmental defect of the brain caused by incomplete neuronal migration and characterized by smoothness of the surface of the brain (lissencephaly) occurring in association with absence of the sulci and gyri (agyria) and thickening of the cerebral cortex with four rather than six layers (pachygyria), microcephaly, characteristic facial appearance, retarded growth and mental development, neurological complications, and multiple abnormalities of the brain, kidneys, heart, gastrointestinal tract, and other organs. Lissencephaly, once considered as synonymous with Walker-Warburg syndrome and Norman-Roberts syndrome, is now recognized as a component of several other syndromes. Type I (the classical form) is a component of Miller-Dieker and Norman-Roberts syndromes, also occurring as a separate entity; Type II the Walker-Warburg and muscle-eye-brain syndrome, also occurring in the Neu-Laxova syndrome.
- Deletion of the short arm of chromosome 17. As initially reported, the syndrome consisted mainly of cleft palate and congenital heart defect. The phenotype was later expanded to include brachycephaly, midfacial hypoplasia, broad nasal bridge, highly arched palate, mandibular prognathism, malformed ears, short hands, mental retardation, and other less constant abnormalities.
- 758.33 is a specific code that can be used to specify a diagnosis
- 758.33 contains 5 index entries
- View the ICD-9-CM Volume 1 758.* hierarchy
758.33 also known as:- Miller-Dieker syndrome
- Smith-Magenis syndrome
Index entries containing 758.33:- Microdeletions NEC
 758.33
Miller-Dieker syndrome 758.33
Smith-Magenis syndrome 758.33
Syndrome - see also Disease- Miller-Dieker 758.33
- Smith-Magenis 758.33
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