Claims help · Evidence
Nexus Letters: Your Questions, Answered
A denial that says your condition isn’t linked to service usually means one thing was missing: a medical opinion connecting the two. Here’s how that opinion, the nexus, works.
- What it is
- When you need one
- The 50% standard
- What the VA weighs
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What Is a Nexus Letter?
It’s a provider’s written opinion on whether your condition stems from service, or, for a secondary claim, from a condition that is already service-connected. Service connection needs a diagnosis, an in-service event, and a link between them. The nexus letter is that link.
When Do I Need One?
Mainly when your records don’t make the connection on their own: knee trouble that showed up years after an airborne landing, for example, or sleep apnea you think is secondary to another service-connected condition. Presumptive conditions, including many under the PACT Act, usually don’t require one.
What Does the VA Look For?
- An opinion that meets the “at least as likely as not” bar, meaning a 50% or higher probability
- A clear sign the provider read your records
- Medical reasoning behind the conclusion, not just the conclusion
- A direct answer to any unfavorable VA opinion already in the file
Soft wording such as “may be related” or “could possibly” tends to be given little weight.
Nexus Letter Q&A: Common Questions
Who is the right person to write a nexus letter?
A qualified clinician who knows your condition, such as your treating physician, a psychologist, or a relevant specialist.
What does “at least as likely as not” mean in practice?
It means a 50% or greater chance that service caused or contributed to the condition. When the evidence is evenly balanced, the VA must give you the benefit of the doubt.
Can a nexus letter help after my claim was denied?
Yes. A new medical opinion is one of the most common kinds of new and relevant evidence filed with a Supplemental Claim.
Does the VA have to consider a private doctor’s opinion?
Yes. It must be weighed alongside the rest of the evidence, and a thorough, well-reasoned opinion can carry real weight.
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