1. G21 Secondary parkinsonism

    Excludes1

    • dementia with Parkinsonism (G31.83)
    • Huntington's disease (G10)
    • Shy-Drager syndrome (G90.3)
    • syphilitic Parkinsonism (A52.19)
    1. G21.0 Malignant neuroleptic syndrome

    2. G21.1 Other drug-induced secondary parkinsonism

      1. G21.11 Neuroleptic induced parkinsonism

      2. G21.19 Other drug induced secondary parkinsonism

        Inclusion term(s):

        • Other medication-induced parkinsonism
    3. G21.2 Secondary parkinsonism due to other external agents

    4. G21.3 Postencephalitic parkinsonism

    5. G21.4 Vascular parkinsonism

    6. G21.8 Other secondary parkinsonism

    7. G21.9 Secondary parkinsonism, 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.