Mood Disorder Not Otherwise Specified (MD-NOS) is designated by the DSM-IV as the diagnostic code (296.90) for mood disorders that are impairing but do not fit any the officially specified diagnoses. According to the DSM-IV, MD-NOS encompasses "any mood disorder that does not meet the criteria for a specific disorder." An adolescent or an adult can be affected by a MD-NOS. An example of a MD-NOS can include being in minor depression frequently in various intervals such as once every month or once in three days.