Specific code 2011 ICD-9-CM Diagnosis Code 331.4
Obstructive hydrocephalus
  • Short description: Obstructiv hydrocephalus.
  • ICD-9-CM 331.4 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 331.4 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
  • You are viewing the 2011 version of ICD-9-CM 331.4.
  • More recent version(s) of ICD-9-CM 331.4: 2012 2013 2014.
Disease Synonyms
  • Acquired hydrocephalus (disorder)
  • Hydrocephalus
  • Hydrocephalus, acquired
  • Hydrocephalus, obstructive
331.4 Excludes
  • congenital hydrocephalus (742.3)
  • idiopathic normal pressure hydrocephalus (331.5)
  • normal pressure hydrocephalus (331.5)
  • spina bifida with hydrocephalus (741.0)
Applies To
  • Acquired hydrocephalus NOS
Convert to ICD-10-CM: 331.4 converts approximately to:
  • 2014 ICD-10-CM G91.1 Obstructive hydrocephalus
ICD-9-CM Volume 2 Index entries containing back-references to 331.4:
  • Hydrocephalus (acquired) (external) (internal) (malignant) (noncommunicating) (obstructive) (recurrent) 331.4
    • aqueduct of Sylvius stricture 742.3
      • with spina bifida (see also Spina bifida) 741.0
    • chronic 742.3
      • with spina bifida (see also Spina bifida) 741.0
    • congenital (external) (internal) 742.3
      • with spina bifida (see also Spina bifida) 741.0
    • due to
      • stricture of aqueduct of Sylvius 742.3
        • with spina bifida (see also Spina bifida) 741.0
      • toxoplasmosis (congenital) 771.2
    • fetal affecting management of pregnancy 655.0
    • foramen Magendie block (acquired) 331.3
      • congenital 742.3
        • with spina bifida (see also Spina bifida) 741.0
    • newborn 742.3
      • with spina bifida (see also Spina bifida) 741.0
    • tuberculous (see also Tuberculosis) 013.8
  • Hydrops 782.3
    • meningeal NEC 331.4
  • Macrohydrocephalus (see also Hydrocephalus) 331.4
  • Obstruction, obstructed, obstructive
    • aqueduct of Sylvius 331.4
      • congenital 742.3
        • with spina bifida (see also Spina bifida) 741.0
  • Occlusion
    • aqueduct of Sylvius 331.4
      • congenital 742.3
        • with spina bifida (see also Spina bifida) 741.0
    • ventricle (brain) NEC 331.4
  • Stenosis (cicatricial) - see also Stricture
    • aqueduct of Sylvius (congenital) 742.3
      • with spina bifida (see also Spina bifida) 741.0
      • acquired 331.4
  • Stricture (see also Stenosis) 799.89
    • aqueduct of Sylvius (congenital) 742.3
      • with spina bifida (see also Spina bifida) 741.0
      • acquired 331.4
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 331.4 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 2011 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.