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Dual Diagnosis
A condition in which individuals have a diagnosed mental illness which interferes with their functioning in a substantial way in combination with a developmental disability. This is the definition used in Ontario and Nova Scotia, for example, while in most of Canada, "Dual Diagnosis" has the same meaning as and is used interchangeably with "Concurrent Disorder" (YF-5000.1500).
The above terms and definitions are part of the Taxonomy of Human Services, used here by permission of INFO LINE of Los Angeles.