A mental health DBQ documents your condition and its effects. A Nexus Letter explains a clinical opinion about its connection to military service or another service-connected condition. Understanding their purposes can help you clarify what you need.
You may have treatment records, an existing diagnosis, and years of experience living with symptoms. Then someone mentions a DBQ or Nexus Letter, leaving you with another unfamiliar term to sort through.
These documents address related clinical questions. Understanding what each contributes helps you approach an evaluation with clearer expectations.
What is a mental health DBQ?
A Disability Benefits Questionnaire, or DBQ, is a standardized VA form used to collect medical evidence. The mental health forms organize findings about diagnosis, relevant history, symptoms, and occupational and social functioning.1
A meaningful evaluation explores how difficulties affect daily life and fit with your history and available records. Two Veterans can share a diagnosis while experiencing different limitations at work, at home, and in their relationships.
The appropriate form depends on the condition and evaluation purpose. VA publishes Mental Disorders and PTSD Review DBQs, with specific instructions for each.1
What is a Nexus Letter?
A Nexus Letter presents a clinician’s opinion about whether a current condition is connected to military service. Depending on the referral question, it may instead address whether an established service-connected condition caused or aggravated another condition.2
Embody Health Psychology, P.A. offers Nexus Letter Evaluations to assess these clinical relationships. We review the relevant records and clinical information, consider other possible explanations, and explain the reasoning behind any supported opinion. If additional information or a clinical interview is needed, we discuss that with you before proceeding.
A diagnosis identifies the condition being evaluated. The nexus opinion addresses its relationship to service or another condition.
How the documents differ
Mental Health DBQ: Organizes clinical findings about the condition, including diagnosis, history, symptoms, and functional impact.
Nexus Letter: Explains an opinion about a clinical relationship, including relevant evidence, reasoning, and an opinion about causation or aggravation.
Do you need both?
That depends on what is already documented and which questions remain unanswered. An evaluation of current functioning may address a different need from an opinion about how a condition developed.
Some Veterans need documentation of current symptoms and functioning. Others also need an opinion addressing an unresolved clinical relationship. Clarifying that question before booking helps determine the appropriate scope of evaluation.
Mental health secondary to a physical condition
A Veteran’s psychological symptoms may develop through the experience of living with a service-connected physical condition. In VA terms, secondary service connection can involve a condition that was caused or aggravated by an existing service-connected disability.4 The following are two illustrative examples among the many possible relationships between physical and mental health.
Example 1: Anxiety secondary to tinnitus
Persistent ringing may make quiet environments difficult, interfere with sleep, or keep someone focused on whether the sound will worsen. An evaluation examines whether these experiences contributed to the development of a diagnosable anxiety condition or worsened an existing one.
The clinical question is specific: How did the Veteran’s service-connected tinnitus contribute to the onset or worsening of the anxiety? We examine the symptom timeline, treatment history, reported experiences, and other possible explanations before reaching an opinion.
Example 2: Depression secondary to a knee injury
A service-connected knee injury may affect far more than mobility. Persistent pain, interrupted sleep, reduced independence, and difficulty participating in work, exercise, or family activities can become part of the clinical picture.
An evaluation explores whether those changes contributed to a depressive disorder or aggravated existing depression. It also documents the resulting psychological limitations, such as reduced motivation, difficulty concentrating, withdrawal from relationships, or trouble sustaining daily responsibilities.
What our health psychology expertise adds
At Embody Health Psychology, P.A., evaluating the connection between physical and emotional health is a central part of our clinical expertise. We examine how the medical condition affects sleep, activity, independence, relationships, and identity, then consider how those changes relate to the psychological symptoms.
Our work brings medical and mental health records together with a detailed clinical interview. We trace when symptoms emerged, how they changed as the physical condition evolved, what treatment addressed, and which other factors may contribute. This supports a clinical explanation of the relationship and its functional impact.
The DBQ documents the psychological condition and its effects. A Nexus Letter, when clinically supported, explains why the service-connected physical condition caused or aggravated it. Having both conditions alone does not establish that relationship; the opinion must be grounded in the Veteran’s individual history and findings.
A private evaluation provides an independent clinical opinion. VA determines service connection and disability ratings, and may request an additional examination.3
Independent Veteran Evaluations
Clarify your next step
Embody Health Psychology, P.A. offers Mental Health DBQ Evaluations, PTSD Review DBQ Evaluations, and Nexus Letter Evaluations. A complimentary consultation can help clarify which service fits your documentation needs. We do not provide initial PTSD DBQs.
Explore our Veteran Mental Health DBQ and Nexus Letter Evaluations for current service and fee information, or schedule a complimentary consultation to discuss your documentation needs.
Telehealth is available in Florida and eligible PSYPACT-participating states.
Book Free Veteran Evaluation Consultation
Footnotes & Sources
U.S. Department of Veterans Affairs. Public Disability Benefits Questionnaires.
U.S. Department of Veterans Affairs. Evidence Needed for a Disability Decision.
U.S. Department of Veterans Affairs. VA Disability Examinations.
Electronic Code of Federal Regulations. 38 C.F.R. § 3.310: Disabilities proximately due to, or aggravated by, service-connected disease or injury.
Sources reviewed October 20, 2026.
