1. Q03 Congenital hydrocephalus

    Includes:

    • hydrocephalus in newborn

    Excludes1

    • Arnold-Chiari syndrome, type II (Q07.0-)
    • acquired hydrocephalus (G91.-)
    • hydrocephalus due to congenital toxoplasmosis (P37.1)
    • hydrocephalus with spina bifida (Q05.0-Q05.4)
    1. Q03.0 Malformations of aqueduct of Sylvius

      Inclusion term(s):

      • Anomaly of aqueduct of Sylvius
      • Obstruction of aqueduct of Sylvius, congenital
      • Stenosis of aqueduct of Sylvius
    2. Q03.1 Atresia of foramina of Magendie and Luschka

      Inclusion term(s):

      • Dandy-Walker syndrome
    3. Q03.8 Other congenital hydrocephalus

    4. Q03.9 Congenital hydrocephalus, unspecified

Abbreviations used here:

NEC Not elsewhere classifiable
This abbreviation in the Tabular List represents “other specified”. When a specific code is not available for a condition, the Tabular List includes an NEC entry under a code to identify the code as the “other specified” code.

NOS Not otherwise specified
This abbreviation is the equivalent of unspecified.