Dissociative Identity Disorder Therapy: Evidence, Phase-Based Treatment, and Emerging Modalities
Oct 5, 2026
Dissociative identity disorder is one of the most complex and clinically demanding conditions a therapist can encounter. The 12-month prevalence of DID is estimated to be 1.5% among American adults. It involves the presence of two or more distinct identity states, accompanied by disruptions in self-perception, memory, and behavior, with memory gaps that exceed normal forgetting—particularly regarding daily events or traumatic experiences.
The treatment of DID is not a matter of applying a single protocol. It is a long-term, phase-based endeavor that requires careful pacing, an understanding of structural dissociation, and a therapeutic relationship strong enough to hold the most fragmented of internal systems. As one source puts it: "The slower you go, the faster you get there".
Until a few years ago, psychotherapeutic treatment for adults with DID consisted primarily of practice-based, phase-based psychodynamic psychotherapy, whose treatment effects on dissociative symptoms are small. In recent years, fundamental research has forwarded new insights important for the conceptualization of DID, and empirically supported treatment modalities with strong evidence bases in adjacent clinical populations have been adapted for application in individuals with DID.
This article provides a comprehensive guide to DID therapy: the three-phase model that constitutes the standard of care, the emerging modalities that are expanding the treatment landscape, the outcome evidence, and the practical principles that guide every session.
The Three-Phase Model — The Standard of Care
The ISSTD practice-based guideline (2011) recommends a three-phase, trauma-informed treatment model known as phase-oriented treatment (PoT) for dissociative disorders. This model is consistent with the broader complex trauma treatment literature, including Herman's three stages of safety, remembrance and mourning, and reconnection.
Although the phases are described separately, there is often fluid movement between them, and safety and stabilization are addressed throughout treatment.
Phase 1: Safety and Stabilization
Phase 1 is often referred to as "safety and stabilization." The goals are fostering a sense of safety and trust in the therapeutic relationship, developing a shared understanding and language around the individual's experiences of dissociation, and enhancing emotion regulation skills.
This is accomplished by providing psychoeducation about complex PTSD and dissociation and by teaching specific skills to maintain safety, increase tolerance of emotions, and manage dissociation with grounding techniques and posttraumatic intrusions with containment techniques. Brand and colleagues have developed a manualized intervention for Phase 1 of DID treatment referred to as Finding Solid Ground, which consists of workbook-based educational modules and homework assignments that can be implemented in individual or group-based settings.
Overall, Phase 1 builds the capacity to tolerate and cope with trauma-related emotions and intrusions, as well as support in differentiating the traumatic past from the present.
Contraindications to moving to Phase 2 include ongoing abuse, severe limitation of reflection and control, psychosis, very unstable lifestyle, and uncontrollable switching. Trauma processing should be delayed if there is chronic low functioning or severe attachment disruption.
Phase 2: Trauma Processing
Phase 2 involves more direct confrontation, working through, and processing of trauma-related memories. However, dissociative symptoms can interfere with effective trauma processing. Specifically, dissociation can impede the emotional learning necessary to extinguish fear and shame around traumatic experiences by disrupting immersion and attention to the traumatic memories.
As such, patients must first decrease reliance on dissociation in Phase 1 to prepare for Phase 2. Trauma processing in Phase 2 of DID treatment emphasizes gradually discussing past and current trauma-related events and feelings while consistently keeping within a patient's window of tolerance for affect.
Phase 2 can also involve short-term manualized interventions for PTSD such as cognitive processing therapy or EMDR therapy, though these can be challenging to implement with fidelity in the treatment of DID. The efficacy of some manualized treatments is diminished when dissociation is the primary, reflexive manner of coping, as is the case in DID. Additionally, suicidality and self-harm behaviors occur at high rates in DID, and adhering to the strict pacing of manualized interventions is not always feasible.
However, specific techniques associated with manualized treatments can be useful when integrated into a collaborative, long-term relational framework.
Phase 2 can also leverage an individual's innate capacity for hypnotic experience by teaching patients to use self-hypnosis. This can provide a boost to a sense of self-efficacy and increased capacity for affect regulation, and can be used therapeutically to significant effect—for example, for increasing a sense of safety, developing inner resources, and helping to regulate abrupt or jarring switches between dissociative self-states that are often provoked by overwhelming affect.
Phase 3: Integration and Rehabilitation
Phase 3 focuses on reconnection. This phase centers around supporting the individual in reconnecting with themselves and developing new connections with others, if they wish.
Some may consider that trauma work is complete once trauma memories are processed and no longer intrusive. However, such work results in a new way of being in the world. This new way of being—in which individuals with DID may no longer experience "not me" senses of self but rather believe and understand that "it was me, after all, all along"—requires time for acclimation and proficiency in new methods for healthy, effective coping.
Core beliefs emerge and need to be reexamined. Rage about the recognition that life is not fair and that many injustices have been suffered may become mature acceptance. Clients begin to relinquish the role of victim.
Important clinical consideration: The percentage of patients who reach the third phase is relatively low, treatment duration is long, and the effects of traditional phase-based psychodynamic treatment on core DID symptoms have been found to be small or absent, leaving room for improvement in the treatment of DID.
The ISSTD Guidelines — A Practical Framework
The ISSTD's Guidelines for Treating Dissociative Identity Disorder in Adults (2011, third revision) is the foundational document for DID treatment. The guidelines are not intended to replace clinical judgment but summarize expert consensus concerning safe and effective treatment.
Key principles from the ISSTD framework include:
Establishing safety, stabilization, and symptom reduction. The pace and intensity of treatment must be aligned with the client's current vulnerabilities and resilience. If a client has DID, separate alters may be in separate stages of treatment. Clients may enter treatment with florid PTSD symptoms; if so, it is best to contain, explain, and promote trust as much as possible.
Establishing and maintaining clear and consistent boundaries is essential. A safety plan can be helpful—identifying who to reach out to, how to self-soothe, and what to do before calling a counselor or going to the emergency room.
Working directly and in depth with traumatic memories. Stage 2 helps to mitigate trauma, bring more control over one's life, and more connection with others.
Promoting identity integration and rehabilitation. Reconnection with everyday life involves identity reintegration and mourning.
Relational perspective on abreaction. It is important to share memories across dissociative barriers so they become part of narrative memory. If affects are simply gotten rid of, memories cannot be mourned—which is a core part of healing. The therapeutic action of abreaction derives from the trusting and sharing of affect among parts and with another person. The healing effect derives from strangulated affects becoming expressible from previously untellable experiences. The central conflict is silencing versus the eagerness to be known: the hurting parts want to tell their story, the unknowing parts do not want to hear it. Sometimes permission needs to be given for certain parts not to hear things for which they are not ready.
Safety problems require a structured approach. Five steps to resolve safety problems: determine if destructive behaviors are outside the person's awareness; assess the function of destructive urges; negotiate a "truce" on self-harm with the client; identify issues underlying destruction; and use DBT, CBT, and problem solving to reduce self-mutilation.
Emerging Evidence-Based Modalities
EMDR Therapy for DID
EMDR therapy is increasingly recognized as a viable modality for DID when adapted appropriately. A sequential approach to reprocessing trauma has been developed—working with different groups of parts of the personality and using a titrated approach to maintain the client within their window of tolerance.
Phase II resourcing protocol. A 2025 protocol for EMDR therapists working with dissociative systems extends beyond the standard "Calm Safe Space" preparation. The protocol includes: orienting to the system; creating or enhancing an inner world safe space; developing internal resources; promoting communication and cooperation; strengthening grounding and orientation resources; supporting switching and transitions; and installing resources with bilateral stimulation, if tolerated.
Adaptation to developmental stage. EMDR needs to adapt to the age and developmental stage of each part rather than applying one method throughout the system. The approach must be consent-based, with cooperation and stabilization preceding trauma processing.
Screening is essential. Standard EMDR therapy procedures require a thorough clinical assessment and formally screening for the presence of a dissociative disorder. The Dissociative Experiences Scale (DES-II) remains the most widely used brief screening tool.
Sequential approach. The treatment uses a sequential approach to reprocess trauma—working with different groups of parts of the personality and using a titrated approach to maintain the client within his or her window of tolerance. When clients have dissociative disorders, there may be a need before starting to address traumatic memories for memories to be contained and processed gradually.
Internal Family Systems (IFS) Therapy for DID
IFS therapy, developed by Richard Schwartz, posits a non-pathological, naturally multiple mind in which parts (managers, exiles, firefighters) operate in relation to a core Self. Schwartz has described DID through the IFS lens, offering an intuitive metaphor for nested or layered parts.
The central 'self' that is referred to in IFS has a similar counterpart in DID—what many call the 'host' or 'host self'—though the personalities, parts, or 'alters' that are central to DID differ in crucial ways.
IFS-oriented hypnotherapy pilot study. A pilot study evaluated the effectiveness of an IFS-oriented hypnotherapy intervention for clients diagnosed with DID. Participants completed a 12-week intervention consisting of weekly sessions integrating IFS therapy with Ericksonian hypnotherapy techniques to promote cooperation among identities.
Case illustration. In a case study of a 28-year-old client with DID who was not aware of her dissociative functioning and was constantly in hyperarousal, EMDR therapy was integrated with the Internal Family System Model. The client had only recalled one traumatic event at age 11 upon arrival in therapy.
Schema Therapy for DID
Schema Therapy (ST) is an integrative psychotherapy that has been proposed as a treatment for DID and is currently being investigated in several studies. A case report of a 43-year-old female patient with DID, depressive disorder (recurrent type), PTSD, cannabis use disorder, and BPD—who received 220 sessions of ST including direct trauma processing through Imagery Rescripting—showed improvement in several domains: reduction of PTSD symptoms, reduction of dissociative symptoms, structural changes in beliefs about the self, and loss of suicidal behaviors. After treatment, she was able to stop her punitive mode, express her feelings and needs to others, and participate adequately in social interaction.
DBT for DID
Dialectical Behavior Therapy is a staged treatment in which behavioral and safety issues are addressed in Stage 1, and trauma work reserved for Stage 2. DBT's Stage 1 focus on establishing safety and reducing suicidal and self-harm behaviors aligns well with Phase 1 of the DID treatment model. DBT skills—particularly distress tolerance and emotion regulation—can be integrated into Phase 1 stabilization work.
Outcome Evidence — What the Research Shows
The Systematic Review
A 2025 systematic review published in the European Journal of Psychotraumatology evaluated the effectiveness of phase-oriented treatment for trauma-related dissociative disorders. The review screened 6,088 articles and included 19 studies that met inclusion criteria.
Key findings:
All treatment types—including phase-oriented treatment, individual psychotherapy, and group therapy—were associated with improvements in symptoms of dissociation, general mental health symptoms, psychopathology, and general functioning.
When compared to one another, each treatment type has its strengths depending on the outcome of interest.
The review demonstrates an emerging evidence base for using psychological interventions to treat dissociative disorders.
High-powered controlled trials are needed to build upon these results to inform clinical practice.
A Novel Phase-Oriented Approach
A 2026 case report described a novel phase-oriented treatment approach for DID comorbid with major depressive disorder and somatization. Dissociative symptoms decreased substantially from baseline (DES = 31.43) to the 45-day follow-up (DES = 6.07). On the DDIS depression subscale, endorsed items decreased from 9/9 at baseline to 1/9 at 45 days. The authors concluded that the phase-oriented model may be feasible and associated with clinically meaningful short-term symptom reduction in DID with depressive and somatic features.
Finding Solid Ground
The Finding Solid Ground program, a manualized Phase 1 intervention, was evaluated in an inpatient treatment study. Patients completed on average 19 of the 30 topics during a one-year study period. They improved with large effect sizes on adaptive capacities, PTSD symptoms, and self-compassion. The majority reliably improved on adaptive capacities and PTSD symptoms.
Long-Term Psychodynamic Psychotherapy
A 2026 case report described long-term psychodynamic psychotherapy with a patient with DID, major depressive disorder, and borderline personality disorder. The treatment course was complemented by secondary strategies such as breathing and relaxation exercises. The report emphasized how a diagnosis of DID reshaped the treatment plan, with prognostic implications discussed.
Dissociative Symptoms as Treatment Outcome
A 2026 systematic review of randomized controlled trials examining dissociative symptoms as a treatment outcome in DID found that in both DID trials, dissociative symptoms did not differ between treatment arms. However, trauma-focused therapy reduced dissociation more than comparators in several trials. Functioning improved in both arms of one trial, and emotion regulation and posttraumatic stress symptoms improved more with the program than on the waitlist in the other.
Practical Principles for Clinicians
The Pacing Principle
"The slower you go, the faster you get there". This principle, attributed to Kluft, captures the essential wisdom of DID treatment. Rushing trauma processing before the system is stabilized risks retraumatization, increases in self-harm, and treatment dropout. The pace and intensity of treatment must be aligned with the client's current vulnerabilities and resilience.
The Boundary Principle
Establishing and maintaining clear and consistent boundaries is essential. A safety plan can be helpful—identifying who to reach out to, how to self-soothe, and what to do before calling a counselor or going to the emergency room.
The Relational Principle
The therapeutic relationship is the foundation of DID treatment. The healing effect of abreactions derives from strangulated affects becoming expressible from previously untellable experiences, shared among parts and with another person.
The Safety Principle
Suicidality and self-harm occur at high rates in DID. Safety must be assessed at every session. Brand and colleagues recommend being aware of increased likelihood for self-mutilation and suicidal ideation, working to identify issues underlying destruction, and using DBT, CBT, and problem solving to reduce self-mutilation. No medications prove helpful with self-harm specifically, though challenging cognitive distortions can be helpful.
The Integration Principle
Integration is the long-term goal, but it is not the only acceptable outcome. The third phase centers on supporting the individual in reconnecting with themselves and developing new connections with others, if they wish. This new way of being—in which individuals may no longer experience "not me" senses of self but rather believe and understand that "it was me, after all, all along"—requires time for acclimation.
The Systems Principle
If the client has DID, separate alters may be in separate stages of treatment. The therapist must track the developmental level and readiness of each part of the system. Permission may need to be given for certain parts not to hear things for which they are not ready.
The Screening Principle
Every patient should be screened for the presence of an underlying dissociative disorder, regardless of the presenting complaint. Standard EMDR procedures require a thorough clinical assessment and formal screening for dissociation. The DES-II remains the most widely used brief screening tool.
FAQ
What is the standard treatment model for dissociative identity disorder?
The standard of care is phase-oriented treatment (PoT) , recommended by the ISSTD. The three phases are: (1) safety and stabilization, (2) trauma processing, and (3) integration and rehabilitation. Although the phases are described separately, there is often fluid movement between them, and safety and stabilization are addressed throughout treatment.
How long does DID treatment typically take?
Treatment duration is long—often measured in years. The percentage of patients who reach the third phase is relatively low. One case report described 220 sessions of Schema Therapy. The principle of "the slower you go, the faster you get there" reflects the clinical reality that pacing is more important than speed.
Can EMDR be used to treat DID?
Yes, EMDR can be adapted for DID. Key adaptations include: a sequential approach to reprocessing trauma with different groups of parts; titrated processing to maintain the client within their window of tolerance; a Phase II resourcing protocol that orients to the system, creates an inner safe space, and promotes communication and cooperation; and adaptation of technique to the age and developmental stage of each part. Screening for dissociation before beginning EMDR is essential.
What is the role of IFS in DID treatment?
Internal Family Systems (IFS) offers a non-pathological framework that views the mind as naturally multiple. The central 'Self' in IFS has a similar counterpart in DID to the 'host' or 'host self.' IFS-oriented hypnotherapy has been investigated as a treatment for DID, and IFS-informed EMDR has been described as a treatment for personality structural dissociation.
What does the outcome evidence show for DID treatment?
A 2025 systematic review of 19 studies found that all treatment types—including phase-oriented treatment, individual psychotherapy, and group therapy—were associated with improvements in dissociative symptoms, general mental health symptoms, psychopathology, and general functioning. A 2026 case report found DES scores decreased from 31.43 at baseline to 6.07 at 45-day follow-up. The Finding Solid Ground program produced large effect sizes on adaptive capacities, PTSD symptoms, and self-compassion.
Conclusion
The treatment of dissociative identity disorder is one of the most demanding and meaningful undertakings in clinical practice. It requires a therapist who can hold complexity without being overwhelmed, who can pace without stalling, and who can maintain hope in the face of profound and chronic suffering.
The three-phase model—safety and stabilization, trauma processing, integration and rehabilitation—provides the framework. The ISSTD guidelines provide the structure. Emerging modalities—EMDR, IFS, Schema Therapy, DBT—provide additional tools that can be integrated into the foundational relational work. The outcome evidence, while still emerging, demonstrates that all treatment types are associated with improvements in dissociative symptoms, general functioning, and psychopathology.
But the evidence also tells a sobering truth: the percentage of patients who reach the third phase is relatively low, treatment duration is long, and the effects of traditional phase-based treatment on core DID symptoms are small. High-quality research is urgently needed to identify more effective treatment options.
What remains constant is the therapeutic relationship. The healing effect of abreactions derives from strangulated affects becoming expressible from previously untellable experiences, shared among parts and with another person. The therapist who can hold that space—patiently, consistently, and without rushing—is offering the most powerful intervention available.
The work is slow. But it is possible. And for the person living with DID, the therapist who understands the phases, respects the pacing, and stays the course is offering something the disorder has never allowed: the experience of being fully known and not abandoned.
References
https://pmc.ncbi.nlm.nih.gov/articles/PMC10950423/pdf/nihms-1968549.pdf
https://www.tandfonline.com/doi/full/10.1080/20008066.2025.2545734
https://search.tradmedlibrary.org/tmgl/?lang=en&q=kw:"Dissociative
https://www.sciencedirect.com/science/article/abs/pii/S2468749926000455
https://www.sciencedirect.com/science/article/abs/pii/S2468749926000194
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Not medical advice. For informational use only.
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