Toxic Exposure Risk Activity (TERA) Explained
A Toxic Exposure Risk Activity is a qualifying activity involving potential exposure during service; TERA development helps VA decide whether an exposure-related exam or opinion is required.
About this guide
Educational information only. Semper Guide is self-directed software, not a VA-accredited representative, law firm, claims agent, VSO, or medical provider. It does not submit claims or guarantee outcomes.
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Quick answer
“TERA” is a claims-development concept, not a diagnosis or automatic grant. VA may document participation through service records, occupational history, deployment information, exposure records, or other evidence and then determine whether a medical examination or opinion is required under the PACT Act framework.
Information that may identify a TERADetails
- Location and dates of deployment or assignment.
- Military occupational specialty and specific duties.
- Known substances, airborne hazards, radiation, contaminated water, or other exposure circumstances.
- Frequency, duration, route, and protective equipment when reliably known.
- Official exposure records, individual exposure data, and credible lay evidence.
What a TERA memorandum doesDetails
- Records VA’s development conclusion about qualifying exposure activity.
- Can guide whether an examination or medical opinion should consider combined exposure effects.
- May contain favorable exposure findings.
- Does not itself diagnose a disability.
- Does not by itself establish a medical nexus or rating.
Presumptive and non-presumptive pathsDetails
- If service and diagnosis meet a presumption, the specified nexus is supplied by law.
- If the condition is not presumptive, VA may still consider direct service connection.
- The medical opinion should address the veteran’s actual exposures and relevant condition, not simply recite the acronym.
- Exceptions to examination requirements exist; the complete statutory and regulatory framework matters.
Common questionsDetails
- Is an ILER entry required? — No single database is the only possible exposure evidence.
- Does conceded TERA mean the claim is granted? — No. Current disability and the applicable nexus or presumption remain.
- Can multiple exposures be considered together? — The PACT Act framework directs consideration of total potential exposure through applicable deployments and activities.
- Is a registry exam a TERA exam? — No. Registry health exams and compensation examinations serve different purposes.
Read the actual development recordDetails
If VA mentions TERA in a decision or exam request, identify the conceded activities, rejected facts, and exact medical question.