Nexus Letters
Nexus Letters for VA Disability Claims
If your medical records don’t clearly connect your current condition to your time in service, a nexus letter can help close that gap. It’s a written medical opinion — not a guarantee, not a legal argument — that gives the VA a clear, physician-documented answer to one question: is it at least as likely as not that your condition is connected to your service?
What Is a Nexus Letter?
A nexus letter is a short, focused document written by a physician. It reviews the medical and service records relevant to your claim and states an opinion on whether your current condition is connected to something that happened during your military service — an injury, an exposure, an event, or a diagnosed condition from that time.
The VA uses a specific standard for this: “at least as likely as not,” meaning a 50% or greater probability. A nexus letter doesn’t need to prove certainty. It needs to speak to that standard, based on the medical evidence.
Why Nexus Letters Matter in a VA Claim
VA claims are decided on the strength of the full record — service treatment records, current medical records, and any additional evidence submitted. Sometimes that record already makes the connection clear. Often, it doesn’t.
A gap in the medical evidence is one of the most common reasons a claim is denied or sent back for more information. A nexus letter exists specifically to address that gap — it doesn’t replace your other evidence, it adds to it.
A nexus letter cannot:
- Guarantee your claim will be approved
- Guarantee a specific disability rating
- Override the VA’s own review of your full file
- Substitute for legal representation or advice
It’s one piece of medical evidence, not a decision.
Do You Need a Nexus Letter?
You may want one if:
- Your medical records don’t explicitly state a connection between your condition and your service
- Your claim was denied and the decision cited insufficient evidence of service connection
- You’re filing for a secondary condition (one caused or worsened by an already service-connected condition) and that relationship isn’t documented anywhere
- Your treating physician hasn’t addressed service connection specifically, only diagnosis and treatment
Common Conditions a VA Nexus Letter Can Help Prove
A nexus letter can be used for almost any condition where the connection to military service isn’t already clearly documented. Some of the most common categories include:
Musculoskeletal conditions — back and neck pain, knee and shoulder injuries, and joint conditions linked to physical strain, injury, or repetitive stress during service.
Mental health conditions — PTSD, depression, anxiety, and other conditions connected to a stressor, injury, or event that occurred in service.
Respiratory conditions — asthma, sleep apnea, and other breathing-related conditions, particularly where environmental or burn pit exposure may be a factor.
Cardiovascular conditions — hypertension and related conditions, especially where service-related stress, exposure, or another already-connected condition may be a contributing factor.
Secondary conditions — conditions caused or worsened by a condition that’s already service-connected (for example, depression secondary to chronic pain, or sleep apnea secondary to PTSD).
Presumptive and exposure-related conditions — conditions potentially linked to Agent Orange, burn pits, or other in-service exposures, where a medical opinion can still help establish the individual connection.
This list isn’t exhaustive, and having a condition on it doesn’t mean a nexus letter will automatically support your claim — that depends on your specific medical history and records. If you don’t see your condition here, [contact us] to ask directly.
Veterans researching a specific condition can also visit our dedicated pages for a closer look at how that condition is typically evaluated:
- How Hypertension Is Rated for VA Disability
- How Depression Is Rated for VA Disability
- How Asthma Is Rated for VA Disability
How the Nexus Letter Process Works
- Share your situation. Tell us about your condition and where things stand with your claim.
- Submit your records. Provide the service and medical records relevant to the condition in question.
- Physician review. A physician reviews the records against the “at least as likely as not” standard.
- Written opinion. If the evidence supports a connection, you receive a written nexus letter to include with your claim. If it doesn’t, you’ll be told that directly.
What Makes a Nexus Letter Credible
The VA and reviewing physicians look for a few specific things in a nexus letter:
- A clear opinion, using the correct legal/medical standard (“at least as likely as not”)
- Medical rationale — the reasoning behind the opinion, not just the conclusion
- Reference to the specific records reviewed, so the opinion is grounded in the actual file
- A qualified, identifiable physician behind the opinion
Frequently Asked Questions
What exactly does a nexus letter say?
It states a physician’s opinion on whether it’s at least as likely as not that your current condition is connected to your military service, along with the medical reasoning behind that opinion.
Will a nexus letter guarantee my VA claim is approved?
No. It’s one piece of medical evidence considered alongside everything else in your claim file. The VA makes the final decision.
Can I get a nexus letter if I've already been denied?
Often, yes — a denial that cites insufficient evidence of service connection is one of the most common reasons veterans seek a nexus letter for a supplemental claim or appeal.
Does a nexus letter work for secondary conditions too?
Yes. Nexus letters can address direct service connection or secondary service connection (where one condition causes or aggravates another).
What records do I need to provide?
Generally, your service treatment records, relevant VA or private medical records, and any prior VA decision letters. [CLIENT TO CONFIRM exact list]
How is a nexus letter different from a Disability Benefits Questionnaire (DBQ)?
A nexus letter addresses whether your condition is connected to your service. A DBQ documents how severe a diagnosed condition currently is. They answer different questions and are sometimes used together.
What if my records don't support a connection?
You’ll be told honestly. A nexus letter is only useful — and only appropriate — when it’s grounded in real medical evidence.
Not Sure If a Nexus Letter Fits Your Claim?
A quick records review can tell you whether the medical evidence supports one — before you spend time or money finding out the hard way.
This page is general information, not individualized medical or legal advice.