OSDD stands for Otherwise Specified Dissociative Disorder, and it’s the last catch-all category in the dissociative disorders (including DID, DPDR, dissociative amnesia, OSDD, and unspecified dissociative disorder, or USDD). The diagnosis DDNOS (dissociative disorder not otherwise specified) was used prior to the DSM-5.
It’s split into several subtypes of OSDD.
OSDD-1 is “almost DID,” but lacking one of the diagnostic criteria for it. OSDD-1a is DID without sufficiently distinct alters, whereas OSDD-1b is DID without amnesia.
OSDD-2 is a change in identity/dissociation caused by coercion, such as a result of torture, brainwashing, thought reform, indoctrination, recruitment into cults/sects/terror organizations, etc).
OSDD-3 is typically a temporary diagnosis for a dissociative disorder brought on by recent trauma. These symptoms tend to not last longer than a month but can include intense dissociation, depersonalization, amnesia, lack of physical abilities and coordination, etc.
OSDD-4 is dissociative trances, when individuals slip into highly dissociative states and may be unconscious of events going on around them, may be confused or amnesiac afterwards, or otherwise slipping in and out of dissociative trances. This diagnosis is only given when the trances cannot be explained by something else, like seizures, drugs, religious or cultural activities, etc.
USDD is diagnosed when a dissociative disorder is present but does not fully meet the criteria for DID, DPDR, dissociative amnesia, or one of the OSDDs. USDD may also be used when the clinician does not choose to disclose more information about the dissociative disorder being diagnosed or is diagnosing quickly in emergency settings (indicating that there’s evidence for a dissociative disorder but not time to diagnose specifically).
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