742.2 REDUCTION DEFORM, BRAIN


Code Information

Diagnosis Code: 742.2

Short Description: Reduction deform, brain

Long Description: Congenital reduction deformities of brain

Code Classification:

  • Congenital anomalies (740–759)
    • Congenital anomalies (740-759)
      • 742 Other congenital anomalies of nervous system
        • 742.2 Reduction deform, brain

Code Version: 2015 ICD-9-CM


References to Index of Diseases and Injuries

The code 742.2 has the following ICD-9-CM references to the Index of Diseases and Injuries
  • Absence (organ or part) (complete or partial)
    • brain 740.0
      • specified part 742.2
    • cerebellum (congenital) (vermis) 742.2
    • corpus callosum (congenital) 742.2
    • vermis of cerebellum 742.2
  • Agenesis - see also Absence, by site, congenital
    • brain 740.0
      • specified part 742.2
    • cerebellum 742.2
    • corpus callosum 742.2
    • vermis of cerebellum 742.2
  • Agyria 742.2
  • Anomaly, anomalous (congenital) (unspecified type) 759.9
    • brain 742.9
      • reduction 742.2
  • Aplasia - see also Agenesis
    • brain 740.0
      • specified part 742.2
    • cerebellar 742.2
    • corpus callosum 742.2
  • Arhinencephaly 742.2
  • Arnold-Chiari obstruction or syndrome (see also Spina bifida) 741.0
    • type IV 742.2
  • Arrhinencephaly 742.2
    • due to
      • trisomy 13 (13-15) 758.1
      • trisomy 18 (16-18) 758.2
  • Chiari's
    • malformation
      • type IV 742.2
  • Deformity 738.9
    • brain (congenital) 742.9
      • reduction 742.2
    • reduction (extremity) (limb) 755.4
      • brain 742.2
  • Holoprosencephaly 742.2
    • due to
      • trisomy 13 758.1
      • trisomy 18 758.2
  • Hypoplasia, hypoplasis 759.89
    • brain 742.1
      • gyri 742.2
      • specified part 742.2
    • cerebellum 742.2
    • corpus callosum 742.2
  • Lissencephalia, lissencephaly 742.2
  • Malformation (congenital) - see also Anomaly
    • Chiari
      • type IV 742.2
  • Microgyria (congenital) 742.2
  • Nondevelopment
    • brain 742.1
      • specified part 742.2
  • Polymicrogyria 742.2
  • Syndrome - see also Disease
    • Arnold-Chiari (see also Spina bifida) 741.0
      • type IV 742.2
    • retroviral seroconversion (acute) V08
    • sick

Crosswalk Information

The code 742.2 converts into the following ICD-10 code(s):
ICD-9 Code ICD-10 Code ICD-10 Description
742.2 Right Arrow Q04.1 Arhinencephaly
Q04.2 Holoprosencephaly
Q04.3 Other reduction deformities of brain
This ICD-9 to ICD-10 data is based on the 2018 General Equivalency Mapping (GEM) files published by the Centers for Medicare & Medicaid Services (CMS) for informational purposes only. The data is not an ICD-10 conversion tool and doesn’t guarantee clinical accuracy.

Similar Codes

ICD-9 Code ICD-9 Description
742.0 Encephalocele
742.1 Microcephalus
742.3 Congenital hydrocephalus
742.4 Other specified congenital anomalies of brain
742.51 Diastematomyelia
742.53 Hydromyelia
742.59 Other specified congenital anomalies of spinal cord
742.8 Other specified congenital anomalies of nervous system
742.9 Unspecified congenital anomaly of brain, spinal cord, and nervous system


This page was last updated on: 10/1/2014