Conditions Secondary to a Traumatic Brain Injury, Explained

A service-connected brain injury can be the starting point for other claims. The regulation that governs those claims is not Diagnostic Code 8045 but 38 CFR 3.310, the secondary service connection rule.

This guide is part of our series on VA claims for traumatic brain injury.

What the regulation provides

38 CFR 3.310(a) provides service connection for a disability that is proximately due to or the result of a service-connected disease or injury. Subsection (b) covers aggravation, where a nonservice-connected condition is made worse by a service-connected one, with compensation based on the degree of aggravation.

Our secondary service connection guide explains the general structure in plain language.

Common secondary claims after a brain injury

Whether any of these applies depends entirely on the individual record and the medical evidence. Conditions veterans commonly raise as secondary to a service-connected TBI include:

• A diagnosed mood or anxiety disorder following the injury
• Sleep disturbance and diagnosed sleep disorders
• Diagnosed headache disorders - see our post-traumatic headaches guide
• Balance and vestibular conditions
• Vision changes with a diagnosed condition
• Tinnitus when tied to the same injury event - see our tinnitus guides

What these claims turn on

Secondary claims rest on a medical link between the service-connected condition and the new one. The VA's evidence page describes the categories of evidence it considers, and our guide to medical evidence in a VA claim explains what a supporting medical opinion addresses.

38 CFR 4.14 applies here too - a symptom already counted in the TBI evaluation is not counted again in the secondary evaluation.

What connects a secondary condition to the TBI

A secondary claim requires more than a general observation that a veteran has both a service-connected TBI and a later diagnosis of another condition. 38 CFR 3.310 requires a link showing the second condition is proximately due to, the result of, or aggravated by the service-connected disability. That link is typically addressed through medical evidence explaining the mechanism connecting the two - for example, how chronic sleep disruption following a brain injury can contribute to the later development of a diagnosed sleep disorder, or how persistent headaches and cognitive symptoms can contribute to a diagnosed mood disorder over time.

The strength of that medical explanation, not just the fact that both conditions exist, is what the regulation asks the VA to weigh.

Aggravation of an existing condition

38 CFR 3.310(b) addresses situations where a condition that existed before the TBI, or that developed independently of it, is made worse by the service-connected brain injury. In these cases, compensation is based on the degree of aggravation - the additional impairment caused by the TBI - rather than the full severity of the condition as it exists now. Establishing a baseline, meaning the severity of the condition before the aggravation occurred, is often a central part of these claims.

Medical evidence describing the condition's severity both before and after the aggravating factor helps establish that baseline and the degree of worsening attributable to the TBI.

Filing a secondary claim

A secondary claim is filed the same way as any other disability claim, identifying the new condition and its relationship to the already service-connected TBI. The VA's page on filing a disability claim describes the general filing process, and supporting medical evidence addressing the secondary relationship is typically submitted along with the claim or gathered as part of the VA's development of it.

This guide is educational. It summarizes the VA's own published rules and links to the exact sources it relies on. It is not legal or claims advice, and it is not a substitute for an accredited representative, who can advise you about your specific claim. Accredited help is free - search the VA's accreditation database to find a Veterans Service Organization, accredited agent, or attorney.