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Updated October 18, 2012

Definition: An abbreviation for the medical term "not otherwise specified". NOS is used as a broad-based diagnostic category, for instance "depression NOS. " The choice of the NOS diagnosis means that the diagnosing doctor believes that the patient's problems fall into a particular family of disorders (e.g., depressive disorders, anxiety disorders, etc.) but that there is not enough information at the time of diagnosis to better specify the type of disorder.
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