Diagnostic critera for DID

The DSM-5-TR states that all of these symptoms must be present to be diagnosed with DID:

"A. Disruption of identity characterized by two or more distinct personality states, which may be described in some cultures as an experience of possession. The disruption of marked discontinuity in sense of self and sense of agency, accompanied by related alterations in affect, behavior, consciousness, memory, perception, cognition, and/or sensory-motor functioning. These signs and symptoms may be observed by others or reported by the individual. B. Recurrent gaps in the recall of everyday events, important personal information, and/or traumatic events that are inconsistent with ordinary forgetting. C. The symptoms cause clinically significant distress or impairment in social, occupational, or other important areas of functioning. D. The disturbance is not a normal part of a broadly accepted cultural or religious practice. Note: In children, the symptoms are not better explained by imaginary playmates or other fantasy play. E. The symptoms are not attributable to the physiological effects of a substance (e.g., blackouts or chaotic behavior during alcohol intoxication) or another medical condition (e.g., complex partial seizures)."

Sources: DSM-5-TR

Diagnostic criteria for OSDD-1A and OSDD-1B

In the DSM-5-TR, there is only one diagnosis, Other Specified Dissociative Disorder with 4 presentations. Presentation 1 states “Chronic and recurrent syndromes of mixed dissociative symptoms: This category includes identity disturbance associated with less-than-marked discontinuities in sense of self and agency, or alterations of identity or episodes of possession in an individual who reports no dissociative amnesia.” The terms OSDD-1a and OSDD-1b came from the former diagnoses DDNOS-1a and DDNOS-1b. A lot of people still identify with these terms today, but it’s not a requirement to label yourself 1a or 1b.

Sources: DSM-5-TR , traumadissociation.com

Diagnostic criteria for PDID

• Disruption of identity characterized by the experience of two or more distinct personality states (dissociative identities), involving discontinuities in the sense of self and agency. Each personality state includes its own pattern of experiencing, perceiving, conceiving, and relating to self, the body, and the environment.
• One personality state is dominant and functions in daily life (e.g., parenting, work), but is intruded upon by one or more non-dominant personality states (dissociative intrusions). These intrusions may be cognitive (intruding thoughts), affective (intruding affects such as fear, anger, or shame), perceptual (e.g., intruding voices fleeting visual perceptions, sensations such as being touched), motor (e.g., involuntary movements of an arm), or behavioural (e.g., an action that lacks a sense of agency or ownership). These experiences are experienced as interfering with the functioning of the dominant personality state and are typically aversive.
• The non-dominant personality states do not recurrently take executive control of the individual’s consciousness and functioning to the extent that they perform in specific aspects of daily life (e.g., parenting, work). However, there may be occasional, limited and transient episodes in which a distinct personality state assumes executive control to engage in circumscribed behaviours (e.g., in response to extreme emotional states or during episodes of self-harm or the reenactment of traumatic memories).
• The symptoms are not better accounted for by another mental disorder (e.g., Schizophrenia or Other Primary Psychotic Disorder).
• The symptoms are not due to the effects of a substance or medication on the central nervous system, including withdrawal effects (e.g., blackouts or chaotic behaviour during substance intoxication), and are not due to a Disease of the Nervous System (e.g., complex partial seizures) or to a Sleep-Wake disorder (e.g., symptoms occur during hypnagogic or hypnopompic states).
• The symptoms result in significant impairment in personal, family, social, educational, occupational or other important areas of functioning. If functioning is maintained, it is only through significant additional effort.

Sources: ICD-11