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Veteran education · Terminology glossary

VA terms, in plain language.

Understand common claims terms and abbreviations, with related guides and official VA references.

Reviewed October 17, 2026 · Serving veterans nationwide

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Board AppealCombined ratingC&P examDeferredEffective dateHigher-Level Review (HLR)Intent to File (ITF)Lay evidence / buddy statementNew and relevant evidenceNexus / medical nexusPresumptive conditionSecondary service connectionService connectionSupplemental Claim

VA terminology

Nexus / medical nexus

A connection between a current condition and military service, or a service-connected disability. A medical nexus opinion explains a clinical connection and its reasoning. A diagnosis alone may not establish the required link; evidence requirements vary.

Definitions reviewed October 17, 2026. Official references open in a new tab. Rules can change; check the current source and your own notice for claim-specific instructions.

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