This block comprises a range of mental disorders grouped together on the basis of their having in common a demonstrable etiology in cerebral disease, brain injury, or other insult leading to cerebral dysfunction. The dysfunction may be primary, as in diseases, injuries, and insults that affect the brain directly and selectively; or secondary, as in systemic diseases and disorders that attack the brain only as one of the multiple organs or systems of the body that are involved.

  1. F03 Unspecified dementia

    Inclusion term(s):

    • Presenile dementia NOS
    • Presenile psychosis NOS
    • Primary degenerative dementia NOS
    • Senile dementia NOS
    • Senile dementia depressed or paranoid type
    • Senile psychosis NOS



    • mild memory disturbance due to known physiological condition (F06.8)
    • senile dementia with delirium or acute confusional state (F05)
    1. F03.9 Unspecified dementia

      1. F03.90 Unspecified dementia without behavioral disturbance

        Inclusion term(s):

        • Dementia NOS
      2. F03.91 Unspecified dementia with behavioral disturbance

        Inclusion term(s):

        • Unspecified dementia with aggressive behavior
        • Unspecified dementia with combative behavior
        • Unspecified dementia with violent behavior
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.