The predominant disturbance is sudden, unexpected travel away from home or one's customary place of work, with inability to recall one's past.
Confusion about personal identity or assumption of a new identity (partial or complete).
The disturbance does not occur exclusively during the course of Dissociative Identity Disorder and is not due to the direct physiological effects of a substance (e.g., a drug of abuse, a medication) or a general medical condition (e.g., temporal lobe epilepsy).
The symptoms cause clinically significant distress or impairment in social, occupational, or other important areas of functioning.
Criteria summarized from:
American Psychiatric Association. (1994). Diagnostic and statistical manual of mental disorders, fourth edition. Washington, DC: American Psychiatric Association.