A nexus letter for depression is a written medical opinion from a qualified provider stating that your diagnosed depressive disorder is at least as likely as not connected to your military service, or to a condition the VA has already service-connected. It’s the piece of evidence that answers “why is this related to service,” which is the question the VA most often finds unanswered in mental health claims. It supports your claim, and the VA makes the decision.
Key takeaways
- Depression is well documented in the veteran population. Research summarized by SAMHSA found that among veterans entering VA health care between October 2001 and January 2008, 17.4% had a depression diagnosis by March 2008.
- Most depression claims run through secondary service connection. Depression that develops alongside service-connected PTSD, chronic pain, tinnitus, or traumatic brain injury is claimed under 38 CFR 3.310, and the letter links depression to that condition rather than back to service directly.
- The reasoning matters more than the conclusion. A letter that states a connection without explaining the medical basis carries less weight than one that walks through the records, the timeline, and the mechanism.
If you are in crisis, help is available right now. Call or text 988 to reach the 988 Suicide & Crisis Lifeline. Veterans can dial 988 and press 1 to reach the Veterans Crisis Line. This is not an emergency service. In an emergency, call 911 or go to the nearest emergency room.
What a nexus letter for depression does
To grant direct service connection, the VA needs three things established under 38 CFR 3.303: a current diagnosed condition, an in-service event or injury or illness, and a medical link between them. That third element is the nexus, and it’s the one a nexus letter addresses.
For depression specifically, the first two elements are often already in your file. You have a diagnosis in your treatment records. You have service records showing a deployment, an injury, an assault, or a period of documented difficulty. What’s missing is a clinician saying, in writing and with reasoning, that one follows from the other.
The VA weighs medical opinions based on who wrote them and how well they’re supported. Under 38 CFR 3.159, competent medical evidence means evidence from a person qualified through education, training, or experience to offer medical diagnoses, statements, or opinions. If you want the fuller picture of the document itself, our guide to what a nexus letter is and what it contains covers the structure in detail.
Direct or secondary: which path is your claim on?
This is the first thing to sort out, because it changes what the letter has to prove.
Direct service connection means your depression began during service or was caused by something that happened during service. The letter connects your current diagnosis to a specific in-service event.
Secondary service connection means your depression developed because of, or was made worse by, a condition the VA has already service-connected. Under 38 CFR 3.310, a disability that is proximately due to or the result of a service-connected condition is treated as service-connected itself. The letter connects depression to that primary condition, not to service directly.
Secondary claims are common in depression cases because depression frequently develops alongside other service-connected conditions. Chronic pain that limits what you can do, PTSD, sleep disruption from tinnitus, and the aftereffects of a traumatic brain injury all have well-recognized relationships with depressive symptoms. If you’re already rated for one of those, the anchor for your claim is already in place.
Working out which path applies to you is worth doing before you ask anyone to write anything. Our article on whether you need a nexus letter for a disability claim walks through the decision, including when a letter isn’t the missing piece.
What the VA looks for in the letter
A depression nexus opinion generally needs to do six things.
- Identify the provider’s qualifications. Education, licensure, specialty, and relevant experience. This is what establishes competency under 38 CFR 3.159.
- List what was reviewed. Service treatment records, post-service mental health records, prior VA decisions, and any lay statements. An opinion built on a records review reads very differently from one built on a conversation.
- State the diagnosis clearly. The current depressive disorder, named and consistent with what appears in your treatment records.
- Use the correct standard. The phrase “at least as likely as not” reflects a 50% or greater probability. That threshold matters because of 38 CFR 3.102, which directs the VA to resolve reasonable doubt in the claimant’s favor when the positive and negative evidence are in approximate balance. Language like “could be” or “may be related” sits below the standard.
- Explain the medical rationale. This is the part that carries the weight. Why this mechanism, why this timeline, why the records support this conclusion rather than another one.
- Be signed and dated.
If you’ve been through this and want the process laid out step by step, our guide on how to get a nexus letter for a VA claim covers gathering records, what to bring, and what to do if your treating provider declines.
What to gather before the evaluation
The quality of the opinion depends heavily on what the provider has to work with. Before your appointment, collect:
- Service treatment records and personnel records, including anything documenting the in-service event you’re claiming
- Mental health treatment records, including diagnoses, medications tried, therapy notes, and hospitalizations
- Prior VA rating decisions and denial letters, which tell the provider exactly what the VA said was missing
- Your own written statement describing when symptoms started and how they’ve affected your work, sleep, relationships, and daily functioning
- Lay statements from people who observed the change, submitted on VA Form 21-10210
The denial letter is the single most useful document if you have one. It usually names the element the VA found unproven, and a letter written to that specific gap is far more useful than a general one.
How VA rating works for depression
The VA evaluates depressive disorders under the General Rating Formula for Mental Disorders in 38 CFR Part 4, with major depressive disorder assigned diagnostic code 9434. Ratings are based on how much your symptoms impair occupational and social functioning, not on the diagnosis alone or on how many medications you take.
This is worth understanding because it changes what’s useful to document. Details about missed work, difficulty maintaining relationships, panic symptoms, memory and concentration problems, and self-care all speak to the rating criteria. Your treatment records should reflect the real picture rather than a compressed summary. For current rating details and to check your claim status, va.gov is the authoritative source.
What a nexus letter cannot do
Being direct about the limits here is more useful than optimism.
A nexus letter cannot supply a diagnosis you don’t have. If depression isn’t documented in your records, the first step is treatment and evaluation rather than a claim. It cannot establish an in-service event that has no support anywhere in your file, though lay statements can sometimes fill that gap. It cannot overcome a well-reasoned negative opinion on its own, and it cannot guarantee any particular outcome. The VA weighs all the evidence and makes the decision.
HealthSource Medical Associates is a medical practice. We are not accredited by the VA to represent veterans in claims, and we don’t prepare or file claims paperwork. For help with the claim itself, va.gov maintains a directory of accredited Veterans Service Organizations, attorneys, and agents, and their services are frequently free.
Frequently asked questions
Can my VA doctor write my nexus letter? Some will and some won’t. VA clinicians are not obligated to write opinions for claims, and many decline as a matter of practice or workload. That’s a common reason veterans seek a private opinion, and a private opinion is legitimate evidence.
Does depression secondary to PTSD need a separate nexus letter? Usually yes, and it needs to be framed as a secondary claim. The letter should link the depressive disorder to the service-connected PTSD under 38 CFR 3.310 rather than to service directly. Whether the VA rates them separately or together depends on how the symptoms overlap.
How long has my depression needed to be documented? There’s no minimum period. What matters is that you have a current diagnosis and a documented history that supports the timeline the letter describes. A longer treatment record generally gives a provider more to reason from.
Will a nexus letter get my claim approved? No document guarantees approval. A well-reasoned opinion addresses the element the VA most often finds missing, which is why it matters, but the VA weighs all the evidence and makes the final decision.
What if the provider’s opinion isn’t favorable? A physician’s opinion follows the evidence. If the records don’t support a connection, an honest evaluation will say so. That’s what makes a favorable opinion worth anything to the VA in the first place.
Requesting a VA independent medical opinion
If your depression claim is missing a medical opinion connecting it to service or to a condition you’re already rated for, a board-certified physician at HealthSource Medical Associates can review your records and complete a VA independent medical opinion. This is a video appointment, and the fee is $479.00. Turnaround depends on the volume of records to review, and we’ll give you a realistic estimate before you book.
We serve patients nationwide, and you’ll need to be physically located in a state where the provider is licensed at the time of your appointment.
Book an appointment · Learn about veteran nexus services
If you’re also looking for ongoing mental health care rather than documentation alone, virtual primary care and our article on a whole-person approach to anxiety and depression are better starting points.
Sources
- 38 CFR 3.303, Principles relating to service connection. eCFR
- 38 CFR 3.102, Reasonable doubt. eCFR
- 38 CFR 3.159, VA assistance in developing claims. eCFR
- 38 CFR Part 3, Subpart A, Ratings and Evaluations; Service Connection. eCFR (includes 3.310, secondary service connection)
- VA Form 21-4138, Statement in Support of Claim. U.S. Department of Veterans Affairs
- Prevalence of Past Year Substance Use and Mental Illness by Veteran Status. SAMHSA
- Depression complexity prevalence and outcomes among Veterans Affairs patients in integrated primary care. PMC
- Heterogeneity in 10-year course trajectories of moderate to severe major depressive disorder among veterans. PMC
- Characteristics of Veterans with a Depression Diagnosis or Depression Symptoms. PMC
- 38 CFR 3.159. Cornell Legal Information Institute
This article is for informational purposes only and is not a substitute for professional medical advice.
Medical documentation supports your request but does not guarantee approval. Final decisions are made by your employer, insurance carrier, leave administrator, school, or applicable state program. For VA disability claims, the U.S. Department of Veterans Affairs makes the final determination.