magnus919_agent-skills/dsm5/references/17-dissociative-disorders.md

Dissociative Disorders — DSM-5-TR Companion Reference

Summarized and paraphrased from DSM-5-TR (American Psychiatric Association, 2022). This file is for orientation and education; verify exact criteria wording, codes, and recording procedures against the official DSM-5-TR before any formal clinical, legal, insurance, or research use.

Chapter Overview

The dissociative disorders involve a disruption of, and/or discontinuity in, the normal integration of consciousness, memory, identity, emotion, perception, body representation, motor control, and behavior. Symptoms are experienced as unbidden intrusions with losses of continuity in subjective experience ("positive" symptoms such as division of identity, depersonalization, derealization) and/or inability to access information or control mental functions normally amenable to access or control ("negative" symptoms such as amnesia). The chapter covers dissociative identity disorder, dissociative amnesia, depersonalization/derealization disorder, other specified dissociative disorder, and unspecified dissociative disorder. These disorders are frequently found after psychologically traumatic experiences and are placed next to, but not part of, the trauma- and stressor-related disorders; both acute stress disorder and PTSD include dissociative symptoms (amnesia, flashbacks, numbing, depersonalization/derealization). Two cautions recur throughout the chapter: dissociative phenomena that are part of a broadly accepted cultural or religious practice are not diagnosed, and amnesia must not be attributable to substance use, a medical condition, or head injury.

Disorders in this chapter

Disorder	ICD-10-CM code(s)	One-line "what it is"
Dissociative Identity Disorder	F44.81	Two or more distinct personality states (or possession) with recurrent gaps in recall
Dissociative Amnesia	F44.0 (F44.1 with dissociative fugue)	Inability to recall important autobiographical information inconsistent with ordinary forgetting
Depersonalization/Derealization Disorder	F48.1	Persistent or recurrent depersonalization and/or derealization with intact reality testing
Other Specified Dissociative Disorder	F44.89	Dissociative symptoms with a specified reason for not meeting full criteria
Unspecified Dissociative Disorder	F44.9	Dissociative symptoms; reason criteria unmet not specified

Dissociative Identity Disorder

Core features

The presence of two or more distinct personality states, or an experience of possession, accompanied by marked discontinuity in sense of self and sense of agency, plus recurrent episodes of dissociative amnesia. The overtness of the personality states varies: some presentations (especially possession-form) are readily observable, but most individuals with the non-possession form do not overtly display or only subtly display the discontinuity. Elaborate alternate identities with distinct names, wardrobes, handwriting, and accents occur in only a minority and are not essential to diagnosis. Individuals may experience voices, independent thought streams, hallucinations in any sensory modality, sudden materializing or vanishing of emotions/impulses/thoughts without a sense of ownership, and feelings that their bodies or actions are "not mine" or "not under my control." Stress often produces transient exacerbation of symptoms.

Diagnostic criteria (summarized)

• Criterion A: Disruption of identity characterized by two or more distinct personality states, which in some cultures may be described as an experience of possession. The disruption involves 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.
• Criterion B: Recurrent gaps in the recall of everyday events, important personal information, and/or traumatic events that are inconsistent with ordinary forgetting.
• Criterion C: Clinically significant distress or impairment in social, occupational, or other important areas of functioning.
• Criterion 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.
• Criterion E: 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).
• Exclusions/rule-outs: Culturally/religiously normative possession (Criterion D); substance/medical causation (Criterion E); imaginary playmates in children.

Onset, prevalence, course

• 12-month prevalence among adults in a small U.S. community study was 1.5%; lifetime prevalence was 1.1% in a representative sample of community-based women in mid-eastern Turkey.
• The disorder may first manifest at almost any age, from early childhood to late life. Children usually present with independently acting imaginary companions or personified "mood" states rather than identity shifting; dissociation in children may cause problems with memory, concentration, and attachment and may be associated with traumatic play. Adolescents commonly come to attention for externalizing symptoms, suicidal/self-destructive behavior, or rapid behavioral shifts often ascribed to ADHD or childhood bipolar disorder. Older individuals may present with symptoms resembling late-life mood disorders, OCD, paranoia, psychotic mood disorders, or cognitive disorders (attributable to dissociative amnesia).
• Overt identity alteration/confusion may be triggered by later traumatic experiences or seemingly inconsequential stressors; major or cumulative life stressors worsen symptoms (e.g., children reaching the age at which the individual was abused; the death or fatal illness of the abuser). Individuals are at high risk for adult interpersonal trauma (rape, intimate partner violence, sexual exploitation, trafficking).

Risk and prognostic factors

• Environmental: early life trauma — neglect and physical, sexual, and emotional abuse, usually before ages 5–6 — in the context of family and attachment pathology is a risk factor. About 90% of individuals in studies from diverse regions report multiple types of early neglect and childhood abuse, often extending into late adolescence; maltreatment may occur outside the family (school, church, neighborhoods, severe bullying). Other repeated early-life traumatic experiences include multiple painful childhood medical and surgical procedures, war, terrorism, and being trafficked beginning in childhood. Onset has also been described after prolonged, often transgenerational, dysfunctional family dynamics without clear neglect or abuse.
• Genetic and physiological: twin studies suggest genetics account for around 45%–50% of interindividual variance in dissociative symptoms, with nonshared, stressful, and traumatic environmental experiences accounting for most of the additional variance. Brain regions implicated include the orbitofrontal cortex, hippocampus, parahippocampal gyrus, and amygdala.
• Course modifiers: ongoing trauma often leads to significant later difficulties. Poorer outcome in adults is related to severe psychosocial stressors, revictimization, ongoing abuse or exploitation, intimate partner violence, refractory substance use, eating disorders, severe medical illness, enmeshment with the abusive family of origin, or ongoing involvement in criminal subgroups.

Suicide risk

Suicidal behavior is frequent: over 70% of outpatients with dissociative identity disorder have attempted suicide, multiple attempts are common, and other self-injurious and high-risk behaviors are highly prevalent. Dissociation itself is an independent risk factor for multiple suicide attempts, and greater severity of dissociative symptom scores is associated with more frequent suicide attempts and nonsuicidal self-injury.

Differential diagnosis

• Dissociative amnesia: DID adds identity disruption with two or more distinct personality states.
• Depersonalization/derealization disorder: no personality/identity states with alterations of self and agency, and typically no dissociative amnesia.
• Major depressive disorder: depression lacks dissociative fluctuations in self and agency and dissociative amnesia; assess whether mood symptoms are experienced in all or most identity states (see 13-depressive-disorders.md).
• Bipolar disorders: DID is commonly misdiagnosed as bipolar II with mixed features; state shifts in DID occur within minutes or hours (atypical even for rapid cycling), are not accompanied by classic bipolar sleep disturbance (instead chronic severe nightmares and nocturnal flashbacks), and are related to shifting dissociative states (see 12-bipolar-and-related-disorders.md).
• Posttraumatic stress disorder: a majority of individuals with DID also meet PTSD criteria. Dissociative amnesia in PTSD is typically limited to specific traumatic events or aspects of them, and depersonalization/derealization in the dissociative subtype of PTSD is tied to posttraumatic reminders, whereas in DID the amnesia is chronic and complex and depersonalization/ derealization can occur in daily life (see 16-trauma-and-stressor-related-disorders.md).
• Schizophrenia and other psychotic disorders: DID hallucinations (including voices of personality states) can resemble Schneiderian first-rank symptoms, but individuals with DID typically experience them as ego-alien and frightening without delusional explanations; DID hallucinations occur in all sensory modalities and relate to autohypnotic/posttraumatic factors, whereas schizophrenia hallucinations are primarily auditory; DID has the highest and schizophrenia the lowest hypnotic capacity among clinical groups. Dissociative amnesia is absent in psychotic disorders (see 11-schizophrenia-spectrum-and-other-psychotic.md).
• Substance/medication-induced disorders: substance-related blackouts must be distinguished from dissociative amnesia when the substance is judged etiologically related to memory loss.
• Personality disorders: longitudinal variability in personality style (attributable to inconsistency among identities) differs from the pervasive, persistent dysfunction of personality disorders, especially borderline type; when decompensated, some individuals display borderline features but typically do not exhibit frantic activity to avoid abandonment (see 27-personality-disorders.md).
• Posttraumatic amnesia due to brain injury: TBI involves loss of consciousness, disorientation/confusion, or neurological signs; dissociative amnesia in DID is accompanied by marked discontinuity in sense of self and agency, which is not a feature of TBI.
• Functional neurological symptom disorder: distinguished by the absence of identity alteration; amnesia, when present, is more limited and circumscribed.
• Factitious disorder and malingering: individuals who feign DID tend to overreport media-based symptoms (dramatic amnesia, melodramatic switching), underreport less-publicized comorbid symptoms such as depression, are relatively undisturbed by or may seem to enjoy "having" the disorder, may ask clinicians to "find" traumatic memories, and create limited, stereotyped alternate identities with amnesia only for events for which gain is sought. In contrast, most individuals with genuine DID are ashamed of and overwhelmed by their symptoms, deny the diagnosis, underreport, and minimize or avoid their trauma history.

Comorbidity

Common comorbidities include PTSD, depressive disorders, substance-related disorders, feeding and eating disorders, obsessive-compulsive disorder, antisocial personality disorder, and other specified personality disorder with avoidant, obsessive-compulsive, or borderline traits. The most common forms of functional neurological symptom disorder are nonepileptic seizures, gait disturbances, and paralyses.

Assessment considerations

• Take a careful history of amnesia (gaps in autobiographical memory, "time loss," unexplained possessions, lapses in well-learned skills) and of discontinuities in sense of self and agency; ask about voices, thought streams, and perceptual changes.
• Establish that amnesia is not attributable to substance use, seizures, or head injury; a medical and neurological workup may be needed.
• Inquire about childhood maltreatment and adult interpersonal trauma; screen for nonsuicidal self-injury and suicide attempts (over 70% of outpatients have attempted suicide).
• Cultural context: in settings where possession is common, fragmented identities may take possession form; possession-form DID is distinguished from culturally accepted possession states by being involuntary, distressing, and uncontrollable, involving conflict with the surrounding milieu, and occurring at times/places that violate cultural or religious norms. Criterion D requires that the disturbance not be a normal part of a broadly accepted cultural or religious practice.
• In children, distinguish from imaginary playmates; in older adults, distinguish amnesia-related presentations from neurocognitive disorder.

Conversation guide

For clinicians / practitioners

• Ask about memory gaps and "losing time" rather than about "alters," which many individuals find alienating; assess discontinuities in sense of self and agency.
• Always evaluate for feigning/malingering when there are forensic or compensation contexts: genuine DID is underreported and distressing, whereas feigned presentations are typically dramatic and accompanied by observable benefit.
• Screen for suicide attempts and nonsuicidal self-injury (very common), substance use, and ongoing abuse/exploitation; assess safety.
• Rule out bipolar disorder (rapid shifts), schizophrenia (voice-hearing), and borderline personality disorder before concluding.

For patients and family members

• Dissociative identity disorder is a condition that develops after severe, repeated early trauma, in which a person experiences disconnections in their sense of self and memory — including feeling like parts of themselves are separate or like they are watching themselves from outside, and gaps in memory for everyday events.
• It is not "split personality" as portrayed in movies, it is not a sign of being dangerous, and it is not faked by the vast majority of people who have it. Treatment helps many people integrate their experiences and live fuller lives.
• What not to assume: having memory lapses or feeling "spaced out" does not mean someone has this disorder — many conditions and normal experiences cause those feelings, and only a qualified clinician can diagnose it.

Dissociative Amnesia

Core features

An inability to recall important autobiographical information — usually of a traumatic or stressful nature — that is inconsistent with ordinary forgetting and is conceptualized as a potentially reversible memory retrieval deficit (rather than damage to memory storage). The deficit is primarily retrograde. Most commonly the amnesia is localized (failure to recall events of a circumscribed period) or selective (recall of some, but not all, events of a period); it may also be systematized (failure to recall a specific category of information) or generalized (loss of most or all of one's life history and/or identity, which is rare). Continuous (anterograde) amnesia — forgetting each new event as it occurs — also occurs. Individuals are frequently unaware of or minimize their memory problems.

Diagnostic criteria (summarized)

• Criterion A: Inability to recall important autobiographical information, usually of a traumatic or stressful nature, that is inconsistent with ordinary forgetting. Note: Most often consists of localized or selective amnesia for a specific event or events, or generalized amnesia for identity and life history.
• Criterion B: Clinically significant distress or impairment in social, occupational, or other important areas of functioning.
• Criterion C: Not attributable to the physiological effects of a substance (e.g., alcohol or other drug of abuse, a medication) or a neurological or other medical condition (e.g., partial complex seizures, transient global amnesia, sequelae of a closed head injury/traumatic brain injury, or another neurological condition).
• Criterion D: Not better explained by dissociative identity disorder, posttraumatic stress disorder, acute stress disorder, somatic symptom disorder, or major or mild neurocognitive disorder.
• Exclusions/rule-outs: Substance/medical/neurological causation (Criterion C, including head injury); better-explained-by-another-disorder (Criterion D).

Specifiers and severity

• With dissociative fugue (F44.1): Apparently purposeful travel or bewildered wandering associated with amnesia for identity or other important autobiographical information. The code for dissociative amnesia without dissociative fugue is F44.0; with dissociative fugue, F44.1. Dissociative fugue is commonly associated with generalized dissociative amnesia.

Onset, prevalence, course

• 12-month prevalence among adults in a small U.S. community study was 1.8%.
• Observed in young children, adolescents, adults, and geriatric populations; amnesia in children younger than 12 is the most difficult to evaluate, and multiple sources (teacher, therapist, case worker) may be needed.
• Onset of generalized amnesia is usually sudden; individuals may experience multiple episodes, and a single episode may predispose to future episodes. Removal from the traumatic circumstances (e.g., combat) may bring rapid return of memory; some episodes of acute generalized amnesia resolve rapidly, while a substantial subgroup develops highly impairing, chronic autobiographical memory deficits that even "relearning" life history does not ameliorate. The memory loss of dissociative fugue may be particularly refractory.

Risk and prognostic factors

• Environmental: severe, acute, or chronic traumatization is the main risk factor. Cumulative early life trauma and adversities, especially physical and sexual abuse, are the major risk factors for childhood/adolescence amnesia; more severe sexual abuse, multiple episodes of childhood sexual abuse, and abuse by a relative (with betrayal by a close attachment figure) increase the extent of childhood autobiographical memory disturbance. Severe cumulative adult trauma (repeated combat, trafficking, prisoner-of-war or concentration-camp experiences) may produce extensive localized, selective, or systematized amnesia. Generalized dissociative amnesia is more common after extreme acute trauma (brutal combat, rape, torture, often with inability to escape) and/or prior major social dislocation, asylum-seeking, or refugee status, and in the context of profound psychological conflict from which the individual feels unable to escape.
• Genetic and physiological: quantitative genetic studies suggest genetics account for about 50% of interindividual variance in dissociative symptoms, with nonshared, stressful environmental experiences accounting for most of the additional variance; candidate-gene studies suggest gene-environment interplay with earlier and more chronic childhood trauma.

Suicide risk

Suicidal and other self-destructive behaviors are common. Suicidal thoughts, impulses, plans, and behavior are a risk when amnesia decreases; case reports suggest suicidal behavior may be a particular risk when amnesia remits suddenly and overwhelms the individual with intolerable memories.

Differential diagnosis

• Dissociative identity disorder: DID includes pervasive discontinuities in sense of self and agency, ongoing amnesia ("time loss") for everyday events, unexplained possessions, major fluctuations in skills/knowledge, and frequent brief amnesic gaps during interactions.
• Posttraumatic stress disorder: some individuals with PTSD cannot recall part or all of a specific traumatic event; when amnesia extends beyond the immediate time of the trauma, comorbid dissociative amnesia may be warranted; the dissociative subtype of PTSD may also include dissociative amnesia (see 16-trauma-and-stressor-related-disorders.md).
• Neurocognitive disorders: major neurocognitive disorders show evidence of neural tissue damage with decline in cognition (attention, executive function, learning and memory, language, perceptual-motor, social cognition); awareness of personal identity is usually spared until late; retrograde amnesia is almost always accompanied by anterograde amnesia. Medical, laboratory, toxicological, and neurological workups are normal in dissociative amnesia (see 26-neurocognitive-disorders.md).
• Substance-related disorders: alcohol/substance "blackouts" or "grayouts" occur only in the context of intoxication; sequential observation after detoxification and careful history usually distinguish these from dissociative amnesia, including when both co-occur (see 25-substance-related-and-addictive-disorders.md).
• Posttraumatic amnesia due to brain injury: TBI involves impact or rapid movement/displacement of the brain, with loss of consciousness, disorientation/confusion, or neurological signs; a neurocognitive disorder due to TBI presents immediately after the injury or after recovery of consciousness. Mild TBI may precede acute dissociative amnesia, but the dissociative memory deficits are out of proportion to the head trauma and follow dissociative, not neurocognitive, patterns.
• Seizure disorders: behavior during a seizure or postictally may be followed by amnesia, but dissociative fugue behavior is usually purposeful, complex, and goal-directed and may last days or longer; serial EEGs usually show abnormalities in seizure disorders; dissociative and epileptic amnesias may coexist.
• Memory deficits associated with electroconvulsive therapy: most commonly for the day of ECT administration, usually unrelated to stressful/traumatic epochs, and generally remitting after the ECT series.
• Catatonic stupor: mutism may suggest amnesia, but failure of recall is usually absent and other catatonic symptoms (rigidity, posturing, negativism) are present.
• Acute dissociative reactions to stressful events (other specified dissociative disorder): amnestic episodes are accompanied by other prominent dissociative symptoms, last hours or days, are circumscribed (micro-amnesias), and occur acutely in response to stressful events, typically lasting less than 1 month.
• Factitious disorder and malingering: no test invariably distinguishes dissociative amnesia from feigned amnesia. Feigned amnesia is more common with acute florid dissociative amnesia; financial, sexual, or legal problems; a wish to escape stressful circumstances; a desire to seem a more interesting patient; or litigation for "recovered memories." Many malingerers confess spontaneously or when confronted.
• Memory changes with aging or mild neurocognitive disorder: mild neurocognitive disorder shows difficulty learning and retaining new information (measurable on verbal-learning tests), unlike the retrograde autobiographical loss of dissociative amnesia.

Comorbidity

As dissociative amnesia begins to remit, affective phenomena may surface (dysphoria, grief, rage, shame, guilt, psychological conflict). Nonsuicidal self-injury and high-risk behaviors may occur. Comorbid conditions include persistent depressive disorder, major depressive disorder, or subthreshold depression; PTSD (many individuals develop it at some point, especially when traumatic antecedents are brought into awareness, often with the dissociative subtype); somatic symptom and related disorders, particularly functional neurological symptom disorder; substance-related and addictive disorders; feeding and eating disorders; and sexual dysfunctions. The most common comorbid personality disorder is other specified personality disorder with mixed features (often avoidant, obsessive-compulsive, dependent, and borderline).

Assessment considerations

• Establish that the memory loss is retrograde, inconsistent with ordinary forgetting, and not attributable to substances, head injury, seizures, or other medical/neurological conditions; a medical and neurological workup (including imaging and EEG where indicated) is appropriate.
• Recognize that individuals often minimize or rationalize their amnesia; obtain collateral history (family, records, multiple sources for children).
• Distinguish localized/selective/systematized/generalized patterns and inquire about dissociative fugue (purposeful travel or bewildered wandering) for the F44.1 specifier.
• Consider malingering when there are forensic, legal, or compensation incentives; feigned amnesia often co-occurs with the same stressors that produce genuine amnesia and can coexist with deliberate feigning.

Conversation guide

For clinicians / practitioners

• Take a careful timeline: does the amnesia involve autobiographical information (retrograde) rather than new learning, and is it out of proportion to any head injury? Rule out substances, seizures, and neurocognitive disorder.
• Ask about dissociative fugue (unexplained travel or wandering) and about suicidal risk, which rises as amnesia resolves.
• In forensic contexts, evaluate for feigning; spontaneous or confronted confession is common in malingering.

For patients and family members

• Dissociative amnesia is a condition in which the mind blocks out important personal information — often connected to a traumatic or extremely stressful experience — in a way that is not ordinary forgetfulness. The memories are usually recoverable with treatment.
• It is not "faking" or "repressing on purpose"; the person often does not even realize the memories are missing until something brings them to light.
• What not to assume: memory loss from a head injury, substances, or medical conditions is different, and only a clinician can tell the difference and guide safe recovery.

Depersonalization/Derealization Disorder

Core features

Persistent or recurrent experiences of depersonalization, derealization, or both, during which reality testing remains intact. Depersonalization is a feeling of unreality or detachment from, or unfamiliarity with, one's whole self or aspects of the self — feelings, thoughts, body, or sensations — with possible diminished sense of agency and, at its most extreme, an out-of-body experience. Derealization is a feeling of unreality or detachment from the world (individuals, objects, all surroundings), as if in a fog, dream, or bubble or behind a veil or glass wall, with possible visual or auditory distortions. Individuals may have depersonalization, derealization, or both; there is no evidence of a distinction between predominantly depersonalization and predominantly derealization presentations.

Diagnostic criteria (summarized)

• Criterion A: Persistent or recurrent experiences of depersonalization, derealization, or both: (1) depersonalization — experiences of unreality, detachment, or being an outside observer with respect to one's thoughts, feelings, sensations, body, or actions (e.g., perceptual alterations, distorted sense of time, unreal or absent self, emotional and/or physical numbing); (2) derealization — experiences of unreality or detachment with respect to surroundings (e.g., individuals or objects experienced as unreal, dreamlike, foggy, lifeless, or visually distorted).
• Criterion B: During the experiences, reality testing remains intact.
• Criterion C: Clinically significant distress or impairment in social, occupational, or other important areas of functioning.
• Criterion D: Not attributable to the physiological effects of a substance (e.g., a drug of abuse, medication) or another medical condition (e.g., seizures).
• Criterion E: Not better explained by another mental disorder, such as schizophrenia, panic disorder, major depressive disorder, acute stress disorder, posttraumatic stress disorder, or another dissociative disorder.
• Exclusions/rule-outs: Substance/medical causation (Criterion D); better-explained-by-another-disorder (Criterion E).

Onset, prevalence, course

• Transient depersonalization/derealization symptoms lasting hours to days are common; approximately one-half of all adults have experienced at least one lifetime episode. The 12-month prevalence of the disorder is markedly less than for transient symptoms; precise estimates are unavailable. One-month prevalence in the United Kingdom is approximately 1%–2%.
• Mean age at onset is 16 years, though onset can be in early or middle childhood; a minority cannot recall ever not having the symptoms. Less than 20% experience onset after age 20, only 5% after age 25, and onset in the fourth decade or later is highly unusual — such cases should be examined for underlying medical conditions (e.g., brain lesions, seizure disorders, sleep apnea).
• Onset ranges from extremely sudden to gradual. Episode duration varies from brief (hours or days) to prolonged (weeks, months, or years). The course is often persistent: about one-third of cases involve discrete episodes, one-third continuous symptoms from the start, and one-third an initially episodic course that becomes continuous. Exacerbations can be triggered by stress, worsening mood or anxiety, novel or overstimulating settings, and physical factors such as lighting or lack of sleep.

Risk and prognostic factors

• Temperamental: harm-avoidant temperament, immature defenses (idealization/devaluation, projection, acting out), and cognitive disconnection schemata (defectiveness, emotional inhibition, themes of abuse/neglect/deprivation) and overconnection schemata (impaired autonomy with dependency, vulnerability, incompetence).
• Environmental: a clear association with childhood interpersonal traumas in a substantial portion of individuals (less prevalent and less extreme than in other dissociative disorders); emotional abuse and emotional neglect are most strongly and consistently associated. Other stressors include physical abuse, witnessing domestic violence, growing up with a seriously impaired or mentally ill parent, and unexpected death or suicide of a family member or close friend; sexual abuse is a much less common antecedent. The most common proximal precipitants are severe stress (interpersonal, financial, occupational), depression, anxiety (particularly panic attacks), and illicit drug use. Symptoms may be specifically induced by tetrahydrocannabinol, hallucinogens, ketamine, MDMA ("ecstasy"), and salvia; marijuana use may precipitate new-onset panic attacks and depersonalization/derealization symptoms simultaneously.

Differential diagnosis

• Illness anxiety disorder: DPDD has a constellation of typical depersonalization/derealization symptoms and lacks other manifestations of illness anxiety (see 18-somatic-symptom-and-related-disorders.md).
• Major depressive disorder: numbness, deadness, and dreamlike feelings occur in major depressive episodes, but DPDD symptoms are associated with further symptoms of the disorder; if depersonalization/derealization clearly precedes the depressive episode or continues after its resolution, DPDD applies (see 13-depressive-disorders.md).
• Obsessive-compulsive disorder: obsessional preoccupation with subjective experience or checking rituals may occur, but OCD symptoms unrelated to depersonalization/derealization are absent.
• Other dissociative disorders: DPDD symptoms should not occur in the context of another dissociative disorder, such as dissociative identity disorder.
• Panic attacks: depersonalization/derealization is one symptom of panic attacks; DPDD is not diagnosed when symptoms occur only during panic attacks that are part of panic disorder, social anxiety disorder, or specific phobia. It can be diagnosed if the depersonalization/derealization component is very prominent from the start and clearly exceeds in duration and intensity the occurrence of panic attacks, or if it continues after panic disorder has remitted or been treated (see 14-anxiety-disorders.md).
• Psychotic disorders: intact reality testing regarding the depersonalization/derealization symptoms is essential; nihilistic delusions ("I am dead," "the world is not real") can be a subjective experience the person knows is not true or a delusional conviction (see 11-schizophrenia-spectrum-and-other-psychotic.md).
• Substance/medication-induced disorders: depersonalization/derealization from acute intoxication or withdrawal is not DPDD; common precipitating substances are marijuana, hallucinogens, ketamine, ecstasy, and salvia (about 15% of all cases are precipitated by such substances). If symptoms persist in the absence of further substance use, DPDD applies; most such individuals become highly phobic of the triggering substance (see 25-substance-related-and-addictive-disorders.md).
• Traumatic brain injury: depersonalization/derealization symptoms are typical after TBI but are distinguished by onset following TBI and the lack of other DPDD symptoms.
• Dissociative symptoms due to another medical condition: onset after age 40 or atypical symptoms/course suggest an underlying medical condition; conduct a thorough medical and neurological evaluation (laboratory studies, viral titers, EEG, vestibular testing, visual testing, sleep studies, brain imaging; ambulatory EEG when seizure disorder is suspected — temporal lobe epilepsy most commonly implicated, with parietal and frontal lobe epilepsy also possible).

Comorbidity

In a convenience sample of adults recruited for depersonalization research, lifetime comorbidities were high for unipolar depressive disorder and for any anxiety disorder, with a significant proportion having both; comorbidity with PTSD was low. The three most commonly co-occurring personality disorders were avoidant, borderline, and obsessive-compulsive.

Assessment considerations

• Establish that reality testing is intact during the experiences (Criterion B) — the key distinction from psychotic disorders.
• Rule out substance use (especially cannabis, hallucinogens, ketamine, ecstasy, salvia) and medical causes (seizures, brain lesions, sleep apnea), particularly with onset after age 40.
• Differentiate from panic-disorder-related symptoms (timing relative to panic attacks) and from depressive symptoms (timing relative to depressive episodes).
• Cultural context: volitionally induced depersonalization/derealization as part of meditative practices prevalent in many religious, spiritual, and cultural contexts should not be diagnosed as a disorder; cultural frameworks may provide explanations (e.g., spiritual/supernatural causes) that affect the level of distress.

Conversation guide

For clinicians / practitioners

• Ask whether the person feels detached from themselves or the world "like in a dream," and whether they know it is not real (intact reality testing) — this distinguishes DPDD from psychosis.
• Inquire about onset age (rare after 25; investigate medically if after 40), precipitating substances, panic attacks, and depression.
• Take a trauma history (emotional abuse/neglect most associated) and screen for comorbid anxiety and depressive disorders.

For patients and family members

• Depersonalization/derealization disorder is a condition in which a person feels persistently detached from their own body or mind, or like the world around them is unreal or dreamlike — while knowing, at the same time, that it is not actually real. It is frightening but not dangerous.
• Brief versions of this feeling are extremely common (many people have felt "outside themselves" at least once); the disorder is diagnosed when the feeling persists or recurs and interferes with life. It is treatable, often with therapy that addresses triggers, anxiety, and stress.
• What not to assume: feeling spaced out or unreal does not mean psychosis or brain damage, and it does not automatically mean this diagnosis — a clinician's evaluation is needed.

Other Specified Dissociative Disorder

Code F44.89. Applies when dissociative symptoms cause clinically significant distress or impairment but do not meet full criteria for a specific dissociative disorder, with the clinician recording the specific reason (e.g., "dissociative trance"). Text examples:

• Chronic and recurrent syndromes of mixed dissociative symptoms: 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.
• Identity disturbance due to prolonged and intense coercive persuasion: individuals subjected to intense coercive persuasion (e.g., brainwashing, thought reform, indoctrination while captive, torture, long-term political imprisonment, recruitment by sects/cults or terror organizations) may present with prolonged changes in, or conscious questioning of, their identity.
• Acute dissociative reactions to stressful events: acute, transient conditions typically lasting less than 1 month, sometimes only hours or days, characterized by constriction of consciousness; depersonalization; derealization; perceptual disturbances (e.g., time slowing, macropsia); microamnesias; transient stupor; and/or alterations in sensory-motor functioning (e.g., analgesia, paralysis).
• Dissociative trance: acute narrowing or complete loss of awareness of immediate surroundings manifesting as profound unresponsiveness or insensitivity to environmental stimuli, possibly with minor stereotyped behaviors (e.g., finger movements) the individual is unaware of or cannot control, and transient paralysis or loss of consciousness. The dissociative trance is not a normal part of a broadly accepted collective cultural or religious practice.

Unspecified Dissociative Disorder

Code F44.9. Applies when dissociative symptoms cause clinically significant distress or impairment but do not meet full criteria for a specific dissociative disorder, and the clinician chooses not to specify the reason — including presentations with insufficient information (e.g., in emergency room settings).

Cross-cutting notes

• Dissociative phenomena that are part of a broadly accepted cultural or religious practice are NOT diagnosed as disorders: possession states in DID (Criterion D), dissociative trance in other specified dissociative disorder, and volitional depersonalization/derealization in meditative practices are all explicitly excluded when culturally or religiously normative.
• Assessment requires a careful history establishing that amnesia is not due to substance use, a medical condition, or head injury — the differential against substance blackouts, seizure disorders, and traumatic brain injury is central and may require medical/neurological workup.
• The relationship to trauma is central: dissociative disorders frequently follow psychological trauma and overlap with PTSD and acute stress disorder (which include amnesia, flashbacks, numbing, and depersonalization/derealization); see 16-trauma-and-stressor-related-disorders.md.
• Suicide risk is high: over 70% of DID outpatients have attempted suicide, and suicidal behavior is common in dissociative amnesia (risk rises as amnesia remits); screen directly.
• Differential vs. borderline personality disorder: longitudinal variability in personality style (identity states) differs from pervasive, persistent dysfunction; both may co-occur (see 27-personality-disorders.md).
• Differential vs. schizophrenia: voices and other hallucinations occur in DID without delusional explanations and with intact reality testing of dissociative symptoms; dissociative amnesia is absent in psychotic disorders (see 11-schizophrenia-spectrum-and-other-psychotic.md).
• Consider feigning/malingering in forensic or compensation contexts: feigned dissociative presentations are dramatic, media-based, and tied to gain, whereas genuine presentations are minimized, avoided, and distressing.
• For cross-cutting differentials spanning chapters, see 40-cross-cutting-differentials.md.