Multidimensional Inventory of Dissociation (MID) : Clinician Scoring Guide
The MID (Multidimensional Inventory of Dissociation) is a 218-item self-report questionnaire that assesses the severity and structure of pathological dissociation, including amnesia, depersonalization, derealization, identity alteration, voice hearing and trance states. It produces 23 primary clinical scales, 10 validity indices, and two global summary scores (DIS-S and DIS-T), and interpretation requires clinical expertise.
Foundational Context
The MID was developed as a multidimensional alternative to brief dissociation screeners (e.g., DES), capturing the rich and varied phenomenology of pathological dissociation. Dell’s model conceptualizes dissociation as discrete, semi-autonomous systems of experience, each with distinct thoughts, emotions, bodily states, and sensory experiences. The MID operationalizes this framework through detailed questions covering internal voices, identity fragmentation, intrusions, amnesia, and somatoform dissociation.
Unlike short-form screeners that focus on general dissociative tendencies, the MID is built to map patterns, profiles, and interactions among dissociative symptoms. This makes it well-suited for differentiating among PTSD, OSDD, and DID, where symptom structures, not just severity, are diagnostically meaningful.
What the MID measures
The MID produces information across:
- 23 primary dissociation scales, including:
- Amnesia
- Depersonalization
- Derealization
- Identity Confusion
- Identity Alteration
- Voice Hearing (internal and external)
- Trance/possession-like states
- Somatoform dissociation
- Thought insertion/withdrawal
- Emotional detachment
- Intrusions and internal conflict
- 10 validity and process indices, including:
- Response inconsistency
- Negativity bias
- Over-endorsement patterns
- Random responding indicators
- Summary Metrics
- DIS-S: overall dissociation severity
- DIS-T: trait dissociation profile
How to administer the MID
- Lengthy (218 items) and best suited for specialized clinics or trauma professionals
- Requires explanation to manage participant fatigue and emotional activation
- May surface distressing internal experiences, appropriate support is important
- Best administered in a safe, stable context with access to clinical support
- Not intended for rapid screening or general mental health settings
- Requires a structured interview (e.g., SCID-D, MID-Interview) for diagnostic follow-up
MID scoring and interpretation
MID scoring is based on scale averages (0–10) derived from item clusters.
General principles:
- Higher scale values → more intense or more frequent dissociative symptoms
- Interpretation is profile-based, not cutoff-based
- Validity indices must be examined before interpreting clinical scales
- Profiles help differentiate:
- Classic PTSD
- Complex PTSD
- OSDD (Other Specified Dissociative Disorder)
- DID (Dissociative Identity Disorder)
Summary scores:
- DIS-S reflects global dissociation severity
- DIS-T reflects chronic dissociation traits independent of acute state factors
Important caveats:
- The MID does not diagnose disorders
- Interpretation requires specialized training in dissociation and trauma
- Scores must be integrated with clinical interviews and collateral information
Psychometric properties
Reliability
- High internal consistency across most scales
- Strong reliability of summary scores
- Good stability over repeated administrations
Validity
- Excellent construct validity with trauma-related disorders
- Distinguishes DID, OSDD, and PTSD through pattern analysis
- Strong convergent validity with DES and structured clinical interviews
- Includes multiple validity indices to detect distortions or inconsistent responding
In the development study (Dell, 2006), the MID demonstrated internal reliability, temporal stability, and convergent, discriminant, and construct validity. It showed incremental validity over the Dissociative Experiences Scale (DES), predicting an additional 18% of the variance in weighted abuse scores on the Traumatic Experiences Questionnaire. Its 168 dissociation items showed a second-order, unifactorial structure.
Limitations
- Length and complexity require significant time and clinician expertise
- Self-report may be influenced by shame, fear, or limited insight
- Some individuals with high dissociation may struggle with consistent reporting
- Not validated for youth populations
- The presence of severe trauma symptoms may amplify item endorsement without reflecting distinct dissociative structure
This library is an academic and clinical reference. A scale described here is not necessarily offered in HiBoop; each page says whether it is.
Bill this assessment
In the US, the Multidimensional Inventory of Dissociation (MID) : Clinician Scoring Guide is usually billed under these CPT codes. Payer rules vary.
Using this assessment in practice
For clinicians
Send it as a gentle check-in before the session. The score is waiting when you open the chart, and the trend builds itself.
For individuals
This page is a clinical reference, not a diagnostic tool. If you have concerns about your own symptoms, bring this information to a qualified mental health professional.
Frequently Asked Questions
Is the MID self-report or clinician-administered?
The MID is a self-report questionnaire completed by the patient. However, because it surfaces complex and potentially distressing experiences — including internal voices, identity states, and severe amnesia — a trained clinician should be present or readily available to provide support and to guide interpretation. Results must be integrated with a structured clinical interview rather than interpreted in isolation.
How is the MID scored?
Each of the MID's 23 primary clinical scales is scored as an average of its constituent items, producing values on a 0–10 scale where higher scores indicate more severe or more frequent dissociative symptoms. Interpretation is profile-based: clinicians examine patterns across all scales alongside 10 validity indices, rather than applying a single total-score cutoff. The two global summary scores — DIS-S (dissociation severity) and DIS-T (trait dissociation) — offer overall indices but do not replace profile analysis.
References
- 1.Dell PF. The multidimensional inventory of dissociation (MID): a comprehensive measure of pathological dissociation. J Trauma Dissociation. 2006;7(2):77-106.View source
- 2.Somer E, Dell PF. Development of the Hebrew-Multidimensional Inventory of Dissociation (H-MID): a valid and reliable measure of pathological dissociation. J Trauma Dissociation. 2005;6(1):31-53.View source
- 3.Laddis A, Dell PF. Dissociation and psychosis in dissociative identity disorder and schizophrenia. J Trauma Dissociation. 2012;13(4):397-413.View source
Last reviewed: Jun 3, 2026
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