Guide series
Nexus Letters and VA Claims: The Basics Series
Plain-English guides to the fundamentals: what a nexus letter is, whether the doctor's location matters, how a C&P exam differs from an independent opinion, the standard of proof, why claims get denied, and where free accredited help fits.
Overview
Start here: nexus letters & claims basics basics.
Before the condition-specific guides make sense, a few fundamentals do: what the VA's standard of proof actually requires, what a nexus letter is and when it changes an outcome, and how the free help available to every veteran fits alongside paid medical evidence.
The guides below cover those fundamentals. Start with what a nexus letter is, then read the guide that matches your question.

What is a VA nexus letter, and when do you actually need one?
A plain explanation of what a nexus letter is, what it must contain to be probative, and the claims where it changes the outcome.
Read the main guideIn this series
Go deeper on your situation.
5 min read'At least as likely as not' - what the VA's standard of proof really means
The 50-percent standard, the benefit-of-the-doubt rule, and why the exact wording in a medical opinion changes how a rater weighs it.
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7 min readSix reasons VA claims get denied when the condition is real
The specific evidentiary gaps behind most denials, and what kind of evidence closes each one.
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6 min readSecondary service connection: the claims most veterans leave on the table
How a condition caused or aggravated by an already service-connected disability can be rated on its own.
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5 min readHow to read your VA decision letter before you buy any evidence
Where the reasons and bases section actually tells you what the claim was missing.
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5 min readDoes the doctor's location matter for a nexus letter?
Why a records-based medical opinion does not depend on where the physician practices, and the one situation where state licensure genuinely matters.
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6 min readThe C&P exam vs. an independent nexus letter: what each one does
The VA's examination and an independent medical opinion answer overlapping questions from different directions. How raters weigh them, and what to do when they conflict.
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6 min readHow to find and work with a VSO - free, accredited help with your claim
Veterans Service Organizations, county service officers, and accredited representatives: who they are, what they cost (nothing), and how to appoint one with VA Form 21-22.
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7 min readWhat does "no nexus" mean in a VA denial letter?
Denial language that points to a missing medical link, what it does and does not mean, and how veterans read the reasons-and-bases section of a VA decision.
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7 min readWhich VA claims most often need a medical opinion
Conditions where the service link is rarely obvious from the records alone, and why those claims tend to turn on an independent medical opinion.
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8 min readThe role of medical evidence in a VA disability claim
What counts as medical evidence, how service treatment records, private records, diagnostics, lay statements, and medical opinions fit together in a claim file.
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7 min readNexus letters, increased ratings, and where a medical opinion fits
How service connection differs from rating percentage, and when a medical opinion is the relevant evidence versus when severity documentation is what matters.
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