If you served in Vietnam and believe that you have a disease caused by herbicide exposure, but that disease is not on VA's list of diseases associated with herbicides like Agent Orange, you may still apply for service-connection. Such a veteran needs to establish entitlement to service connection on a "direct" (rather than "presumptive") basis. In these cases, VA requires:
- Competent medical evidence of a current disability
- Competent evidence of exposure to an herbicide in Vietnam; and
- Competent medical evidence of a nexus (causal relationship) between the herbicide exposure and the current disability.