What must a veteran show to establish service connection for a disability? Answer in under 100 words. Cite only eCFR (www.ecfr.gov) sources.
Details / How it works
Service connection is established when the evidence shows that a particular injury or disease resulting in disability was incurred coincident with service in the United States Armed Forces, or, if preexisting such service, was aggravated therein.
This may be accomplished by:
- Affirmatively showing inception or aggravation during service, or
- Through the application of statutory presumptions (e.g., presumptions for certain chronic diseases under 38 U.S.C. §§ 1101, 1110, 1112, 1131, 1137).
Each disabling condition shown by a veteran's service records, or for which the veteran seeks service connection, must be considered on the basis of the places, types, and circumstances of service as shown by service records, the official history of each organization in which the veteran served, medical records, and all pertinent medical and lay evidence. Determinations are based on review of the entire evidence of record, with due consideration to the policy of the U.S. Department of Veterans Affairs (VA) to administer the law under a broad and liberal interpretation consistent with the facts in each individual case.
Numbers & thresholds
| Method | Evidentiary Requirement |
|---|---|
| Direct inception or aggravation in service | Affirmative showing of inception or aggravation during service |
| Chronic disease shown in service (or within presumptive period) | Subsequent manifestations of the same chronic disease at any later date are service connected, unless clearly attributable to intercurrent causes |
| Chronicity in service | Combination of manifestations sufficient to identify the disease entity, and sufficient observation to establish chronicity at the time (not merely isolated findings or a diagnosis including the word "Chronic") |
| Continuity of symptomatology | Required where the condition noted during service is not shown to be chronic or where diagnosis of chronicity may be legitimately questioned; when fact of chronicity in service is not adequately supported, a showing of continuity after discharge is required |
| Preservice disability | Clear and unmistakable proof (a high evidentiary standard) — no additional or confirmatory evidence necessary when established per universally recognized medical principles |
| Postservice initial diagnosis of disease | All evidence, including that pertinent to service, must establish that the disease was incurred in service |
| Presumptive period for chronic diseases | One year post-discharge (under 38 C.F.R. § 3.307), not intended to limit service connection where evidence warrants direct service connection |
Exceptions & edge cases
Conditions excluded from service connection: Congenital or developmental defects, refractive error of the eye, personality disorders, and mental deficiency as such are not diseases or injuries within the meaning of applicable legislation (38 U.S.C. §§ 101(11), 1110, 1131).
Preservice conditions: When residual conditions (scars, fibrosis of the lungs, atrophies following nervous system disease, healed fractures, absent or displaced organs, supernumerary parts, congenital malformations, hemorrhoidal tags or tabs) are noted or discovered during service with no evidence of pertinent antecedent active disease or injury, the conclusion must be that they preexisted service. Infectious conditions manifested in less than the respective incubation periods after reporting for duty are held to have preexisted service.
Personality disorders and chronic psychoneurosis: Characterized by developmental defects or pathological trends in the personality structure manifested by a lifelong pattern of action or behavior, or other psychiatric symptomatology shown to have existed prior to service with the same manifestations during service, will be accepted as showing preservice origin.
Sources
- [1]U.S. Government Publishing Office / Department of Veterans Affairs — 38 CFR 3.303 — Principles of service connection for VA disability benefits · as of 2026-08-27
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