For some conditions, the law assumes service caused them. Knowing whether you fall under a presumption can save you the hardest part of the fight.
Normally you have to prove the nexus, the link between your condition and service. But for certain conditions and certain veterans, Congress and the VA have already conceded that link. These are presumptive conditions, and they can remove the hardest hurdle in your claim.
How a presumption works
If you have qualifying service and a listed condition that appears within the required window, the VA presumes service caused it. You still have to show you have the condition and that your service qualifies, but you do not have to prove the medical link from scratch.
Common presumptive categories
- Agent Orange exposure (Vietnam and certain other service)
- Gulf War undiagnosed and chronic multisymptom illnesses
- Burn pit and airborne-hazard conditions expanded under the PACT Act
- Radiation, Camp Lejeune water, and certain chronic diseases within a year of discharge
The mistake I see most: veterans who were denied years ago, before their condition was added to a presumptive list. If the law changed, your old "no" is not the final answer. We re-file under the new rule.
The regulatory authority behind toxic-exposure claims lives in M21-1, Part IV, Subpart ii, Chapter 2, Section C (Service Connection for Disabilities Resulting from Exposure to Environmental Hazards). This section governs how raters develop and adjudicate toxic-exposure claims, including burn-pit, Agent Orange, contaminated-water, and radiation claims, and cross-references the PACT Act's conceded-exposure framework under 38 U.S.C. §1168 (TERA). When a C&P examiner renders a negative nexus opinion without addressing the documented exposure pathway, that opinion is inadequate under Barr v. Nicholson, and raters are required to return it for a supplemental opinion. Veterans who receive a denial after a cursory exam should cite the specific M21-1 development procedures the rater failed to follow.
