2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Congenital Anomalies 740-759 > Other Congenital Anomalies Of Nervous System 742.* > 2006 ICD-9-CM Diagnosis 742.1 Microcephalus View the most recent version of ICD-9-CM 742.1 Abnormal smallness of the head, usually associated with mental retardation. 742.1 is a specific code that can be used to specify a diagnosis 742.1 contains 21 index entries View the ICD-9-CM Volume 1 742.* hierarchy Alternate Terminology Hydromicrocephaly Micrencephaly  Index entries containing 742.1: Absence (organ or part) (complete or partial) skull bone 756.0 with microcephalus 742.1 Agenesis - see also Absence, by site, congenital skull (bone) 756.0 with microcephalus 742.1 Anomaly, anomalous (congenital) (unspecified type) 759.9 bone NEC 756.9 skull 756.0 with microcephalus 742.1 skull (bone) 756.0 with microcephalus 742.1 specified type NEC bone(s) 756.9 skull 756.0 with microcephalus 742.1 skull (bone(s)) 756.0 with microcephalus 742.1 Deformity 738.9 skull (acquired) 738.19 congenital 756.0 with microcephalus 742.1 Distortion (congenital) skull bone(s) 756.0 with microcephalus 742.1 Hydromicrocephaly 742.1 Hypoplasia, hypoplasis 759.89 brain 742.1 gyri 742.2 specified part 742.2 cephalic 742.1 skull (bone) 756.0 with microcephalus 742.1 Idiot, idiocy (congenital) 318.2 microcephalic 742.1 Imperfect closure (congenital) skull 756.0 with microcephalus 742.1 Micrencephalon, micrencephaly 742.1 Microcephalus, microcephalic, microcephaly 742.1 due to toxoplasmosis (congenital) 771.2 Microencephalon 742.1 Nondevelopment brain 742.1 specified part 742.2 Oligoencephalon 742.1 Undeveloped, undevelopment - see also Hypoplasia brain (congenital) 742.1 cerebral (congenital) 742.1