1. Q03 Congenital hydrocephalus

    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.