Specific code 2015 ICD-9-CM Diagnosis Code 742.1
  • 2015
  • Billable Code
  • ICD-9-CM 742.1 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 742.1 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
Disease Synonyms
  • Brain hypoplasia, congenital
  • Congenital brain hypoplasia
  • Congenital hypoplasia of brain (disorder)
  • Hydromicrocephaly
  • Microcephaly
  • Primary microcephaly
Clinical Information
  • A congenital abnormality in which the cerebrum is underdeveloped, the fontanels close prematurely, and, as a result, the head is small. (desk reference for neuroscience, 2nd ed.)
  • A congenital or acquired developmental disorder in which the circumference of the head is smaller than normal for the person's age and sex. It is the result of brain developmental delay
  • Abnormal smallness of the brain
  • Smallness of the head produced by incomplete development of the brain, often associated with below normal mental and cognitive development
Applies To
  • Hydromicrocephaly
  • Micrencephaly
Convert to ICD-10-CM: 742.1 converts directly to:
  • 2015 ICD-10-CM Q02 Microcephaly
ICD-9-CM Volume 2 Index entries containing back-references to 742.1:
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 742.1 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2015 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.