Nexus Readiness for VA Disability Claims
A nexus is the link between a current medical condition and military service. Learn how to prepare clear, organized evidence so a qualified provider can write the strongest possible nexus opinion.
Educational guidance only. Not medical or legal advice. Independent and not affiliated with VA. No guarantee of claim approval or rating outcome.
What strong nexus evidence looks like
Current diagnosis
A documented current diagnosis from a qualified provider establishes the condition exists today.
In-service event or exposure
Service records, incident reports, or buddy statements that show the event, injury, or exposure occurred.
Medical opinion connecting the two
A written opinion stating the condition is at least as likely as not related to service, with supporting rationale.
Related guides
- VA claim readiness checklist
- Preparing medical evidence and care history
- Find VA-accredited professionals
Frequently asked questions
What is a nexus letter?
A nexus letter is a written medical opinion from a qualified provider explaining that a veteran's current condition is at least as likely as not connected to military service.
Do I always need a nexus letter?
Not always. Presumptive conditions and well-documented service-connected conditions may not require one, but a strong nexus opinion can significantly help borderline or complex claims.
Who can write a nexus letter?
A licensed medical provider qualified to evaluate the condition — typically an MD, DO, psychologist, or other licensed specialist. ClaimPrep Vet is educational and does not provide medical opinions.
How do I prepare for a nexus evaluation?
Organize service records, medical history, current diagnoses, and a symptom timeline. A well-prepared file helps the evaluating provider write a clear, supported opinion.