Mild Traumatic Brain Injury
Blast overpressure, mounted and dismounted IED exposure, combat and training head trauma, and repetitive low-level blast from breaching, artillery and heavy weapons as the DIRECT cause of traumatic brain injury in service members — the deployment-era epidemiology establishing the in-service injury event, the imaging and neuropathology evidence that blast produces an objectively distinct brain injury, and the longitudinal evidence that symptoms and disability persist for years after separation, which is the basis on which residuals-of-TBI claims are most often denied.
38 CFR diagnostic code 8045
Peer-reviewed evidence · 13 studies
Every one links to its record
Institute of Medicine (US) Committee on Gulf War and Health: Brain Injury in Veterans and Long-Term Health Outcomes. Gulf War and Health: Volume 7: Long-Term Consequences of Traumatic Brain Injury. National Academies Press (Washington, DC); 2008. PMID:25009909. doi:10.17226/12436. Available at: https://www.ncbi.nlm.nih.gov/books/NBK214701/.
PMID 25009909Check the record (opens in a new tab)Eapen BC, Bowles AO, Sall J, Lang AE, Hoppes CW, Stout KC, Kretzmer T, Cifu DX. The management and rehabilitation of post-acute mild traumatic brain injury. U.S. Dept. of Veterans Affairs & Dept. of Defense (synopsis published in Brain Inj); 2022. PMID:35152817. doi:10.1080/02699052.2022.2033848.
PMID 35152817Check the record (opens in a new tab)Terrio H, Brenner LA, Ivins BJ, Cho JM, Helmick K, Schwab K, Scally K, Bretthauer R, Warden D. Traumatic brain injury screening: preliminary findings in a US Army Brigade Combat Team J Head Trauma Rehabil. 2009;24(1):14-23. PMID:19158592. doi:10.1097/HTR.0b013e31819581d8.
PMID 19158592Check the record (opens in a new tab)
Key facts
- Diagnostic code
- 8045
- Verified studies
- 13
- Legal theories
- Direct (§ 3.303)
Peer-reviewed evidence (13)
The verified studies behind a Mild Traumatic Brain Injury claim — each links to its real PubMed or DOI record. These are sources our nexus drafts can draw from; none are invented.
- Institute of Medicine (US) Committee on Gulf War and Health: Brain Injury in Veterans and Long-Term Health Outcomes. Gulf War and Health: Volume 7: Long-Term Consequences of Traumatic Brain Injury. National Academies Press (Washington, DC); 2008. PMID:25009909. doi:10.17226/12436. Available at: https://www.ncbi.nlm.nih.gov/books/NBK214701/.
- Eapen BC, Bowles AO, Sall J, Lang AE, Hoppes CW, Stout KC, Kretzmer T, Cifu DX. The management and rehabilitation of post-acute mild traumatic brain injury. U.S. Dept. of Veterans Affairs & Dept. of Defense (synopsis published in Brain Inj); 2022. PMID:35152817. doi:10.1080/02699052.2022.2033848.
- Terrio H, Brenner LA, Ivins BJ, Cho JM, Helmick K, Schwab K, Scally K, Bretthauer R, Warden D. Traumatic brain injury screening: preliminary findings in a US Army Brigade Combat Team J Head Trauma Rehabil. 2009;24(1):14-23. PMID:19158592. doi:10.1097/HTR.0b013e31819581d8.
- Mac Donald CL, Johnson AM, Cooper D, Nelson EC, Werner NJ, Shimony JS, Snyder AZ, Raichle ME, Witherow JR, Fang R, Flaherty SF, Brody DL. Detection of blast-related traumatic brain injury in U.S. military personnel N Engl J Med. 2011;364(22):2091-2100. PMID:21631321. doi:10.1056/NEJMoa1008069.
- Carr W, Kelley AL, Toolin CF, Weber NS. Association of MOS-Based Blast Exposure With Medical Outcomes Front Neurol. 2020;11:619. PMID:32849167. doi:10.3389/fneur.2020.00619.
- Shively SB, Horkayne-Szakaly I, Jones RV, Kelly JP, Armstrong RC, Perl DP. Characterisation of interface astroglial scarring in the human brain after blast exposure: a post-mortem case series Lancet Neurol. 2016;15(9):944-953. PMID:27291520. doi:10.1016/S1474-4422(16)30057-6.
- Barnes DE, Byers AL, Gardner RC, Seal KH, Boscardin WJ, Yaffe K. Association of Mild Traumatic Brain Injury With and Without Loss of Consciousness With Dementia in US Military Veterans JAMA Neurol. 2018;75(9):1055-1061. PMID:29801145. doi:10.1001/jamaneurol.2018.0815.
- Mac Donald CL, Barber J, Jordan M, Johnson AM, Dikmen S, Fann JR, Temkin N. Early Clinical Predictors of 5-Year Outcome After Concussive Blast Traumatic Brain Injury JAMA Neurol. 2017;74(7):821-829. PMID:28459953. doi:10.1001/jamaneurol.2017.0143.
- Lindquist LK, Love HC, Elbogen EB. Traumatic Brain Injury in Iraq and Afghanistan Veterans: New Results From a National Random Sample Study J Neuropsychiatry Clin Neurosci. 2017;29(3):254-259. PMID:28121256. doi:10.1176/appi.neuropsych.16050100.
- Chase RP, Nevin RL. Population estimates of undocumented incident traumatic brain injuries among combat-deployed US military personnel J Head Trauma Rehabil. 2015;30(1):E57-64. PMID:24810487. doi:10.1097/HTR.0000000000000061.
- Helmick KM, Spells CA, Malik SZ, Davies CA, Marion DW, Hinds SR. Traumatic brain injury in the US military: epidemiology and key clinical and research programs Brain Imaging Behav. 2015;9(3):358-66. PMID:25972118. doi:10.1007/s11682-015-9399-z.
- Trotter BB, Robinson ME, Milberg WP, McGlinchey RE, Salat DH. Military blast exposure, ageing and white matter integrity Brain. 2015;138(Pt 8):2278-92. PMID:26033970. doi:10.1093/brain/awv139.
- Martindale SL, Kolaja CA, Belding JN, Liu L, Rull RP, Trone DW, Rowland JA. Blast exposure and long-term diagnoses among veterans: a millennium cohort study investigation of high-level blast and low-level blast Front Neurol. 2025;16:1599351. PMID:40823299. doi:10.3389/fneur.2025.1599351.
Controlling law
The CFR sections and cases the theories relevant to this condition rest on — the legal standard raters evaluate against, never a prediction about any claim.
Direct (§ 3.303)
Regulation
38 C.F.R. § 3.303
Direct service connection — a current disability linked to service. (Continuity of symptomatology under § 3.303(b) is limited by case law to the § 3.309(a) chronic diseases — Walker.)
Case law
Shedden v. Principi, 381 F.3d 1163 (Fed. Cir. 2004)
The three-element test: current disability, in-service event, and a nexus between them.
Holton v. Shinseki, 557 F.3d 1363 (Fed. Cir. 2009)
Federal Circuit restatement of the same three direct-service-connection elements.
Caluza v. Brown, 7 Vet. App. 498 (1995)
The evidentiary framework a rater weighs each element against.
Walker v. Shinseki, 708 F.3d 1331 (Fed. Cir. 2013)
Continuity of symptomatology (§ 3.303(b)) is available ONLY for a chronic disease listed in § 3.309(a); any other condition must use the medical-nexus pathway.
Davidson v. Shinseki, 581 F.3d 1313 (Fed. Cir. 2009)
A categorical 'a medical opinion is always required for nexus' is legal error — competent lay evidence can suffice.
Jandreau v. Nicholson, 492 F.3d 1372 (Fed. Cir. 2007); Layno v. Brown, 6 Vet. App. 465 (1994)
A veteran is competent to report symptoms they personally observe (Layno), and lay evidence can even establish a simple diagnosis in the right case (Jandreau).
McLendon v. Nicholson, 20 Vet. App. 79 (2006)
A LOW threshold — evidence that merely indicates a nexus MAY exist obligates VA to provide a C&P exam.
38 U.S.C. § 5107(b); Gilbert v. Derwinski, 1 Vet. App. 49 (1990)
When the evidence is in relative equipoise, the tie goes to the veteran — the preponderance must be AGAINST the claim to deny it.
Related guides & tools
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Educational information about the evidentiary standard — not legal or medical advice, and never a prediction about any claim.