Nexus Letter vs. DBQ: What's the Difference and Which One Do You Need?

These two documents get confused constantly, and filing the wrong one can stall your claim.

A DBQ (Disability Benefits Questionnaire) is a standardized VA form that documents the current severity of your condition. It includes objective findings from an examination: range of motion, test results, functional limitations, symptom frequency. The VA uses DBQs to assign your rating percentage. A DBQ answers "how bad is it right now?"

A nexus letter is a medical opinion connecting your condition to military service. It's not a form. It's a written argument from a physician explaining why your diagnosis is at least as likely as not related to service, or to another service-connected condition. A nexus letter answers "is it connected to service?"

They serve completely different purposes and one doesn't replace the other.

Filing for initial service connection where the link isn't obvious from your records? You need a nexus letter. The VA won't grant service connection without that link, no matter how thorough your DBQ is.

Already service-connected and filing for an increased rating because your condition worsened? You probably need a DBQ, not a nexus letter. The connection to service is already established. You need updated medical evidence showing greater severity.

Filing a new claim for a condition that isn't service-connected yet? You might need both: a nexus to establish the connection and a DBQ to document severity for the rating.

Common mistakes: veterans get a DBQ thinking it establishes service connection. It doesn't. It documents your current condition but says nothing about whether it's related to service. The opposite happens too: veterans pay for a nexus letter when what they actually need is an updated DBQ for an increased rating.

When in doubt, ask your VSO. They can tell you exactly what your specific claim needs.