VA TBI Rating: How 38 CFR 4.124a and DC 8045 Determine Your Disability

What the VA Uses to Rate TBI

Traumatic brain injury is one of the most misrated conditions in the VA system. Veterans walk out of C&P exams with 10 percent ratings when their symptoms clearly warrant far more. The reason is almost always the same: the examiner did not fully document the ten facets of TBI impairment, or the veteran did not know what to report.

The VA rates TBI under 38 CFR § 4.124a using Diagnostic Code 8045. Unlike most diagnostic codes that assign a single percentage based on severity, DC 8045 breaks TBI into ten separate facets of cognitive and neurological impairment. Each facet is rated on a scale from 0 to 3, and the overall disability rating is determined by the highest-rated facet — not an average. If nine facets are at level 1 but one is at level 3, your rating is based on that level 3 facet.

The Ten Facets of DC 8045

Under DC 8045, the VA evaluates these ten areas of TBI-related impairment:

1. Memory, attention, concentration, and executive functions
2. Judgment
3. Social interaction
4. Orientation
5. Motor activity
6. Visual spatial orientation
7. Subjective symptoms (headaches, dizziness, fatigue)
8. Neurobehavioral effects (irritability, impulsivity, aggression)
9. Communication
10. Consciousness

Each facet is scored from 0 (no impairment) to 3 (severe impairment). The corresponding rating percentages are: 0 percent for level 0, 10 percent for level 1, 40 percent for level 2, and 70 percent for level 3. A total score of 5 or more across all facets, or a single facet at level 3, results in a 100 percent rating.

How the C&P Exam Works for TBI

The TBI C&P exam is one of the more involved exams the VA conducts. The examiner — ideally a neurologist or neuropsychologist — assesses all ten facets using clinical observation, standardized testing, and your reported history.

What you say during the exam directly shapes how each facet gets scored. Telling the examiner you have occasional headaches is different from telling them you have daily headaches that force you to stop working and lie down in a dark room. Both are headaches. Only one accurately reflects a level 2 or level 3 impairment. Before your exam, write out specific examples for each facet. The VA C&P Exam Playbook walks through exactly how to prepare for this kind of structured evaluation.

Service Connection for TBI

Before the VA can rate your TBI, you need service connection. Under 38 CFR § 3.303, direct service connection requires three elements: a current diagnosis, an in-service event or injury, and a medical nexus linking the two.

For TBI, the in-service event is usually a blast exposure, vehicle accident, fall, or direct head trauma. If your records are incomplete, buddy statements from fellow service members who witnessed the incident can fill the gap under 38 CFR § 3.303(a). The nexus is typically established through a physician or neuropsychologist who writes a medical opinion stating your TBI is at least as likely as not related to your military service.

Secondary Conditions Linked to TBI

TBI rarely travels alone. Veterans with service-connected TBI frequently develop secondary conditions ratable under 38 CFR § 3.310, including PTSD (DC 9411), migraines (DC 8100), depression, sleep apnea (DC 6847), and tinnitus. Each requires its own claim and its own nexus — the VA will not connect them automatically. The free VA claim tools on this site can help you map out which secondary conditions apply to your situation.

What to Do If Your TBI Rating Is Too Low

If your TBI rating does not reflect your actual impairment, start by getting your C&P exam report from your C-file and comparing what the examiner documented against what you reported. Examiners sometimes understate symptoms or skip facets entirely.

If the exam was inadequate, file a Supplemental Claim under 38 CFR § 3.2501 with a private neuropsychological evaluation that fully documents each facet. If the rating decision itself misapplied DC 8045 — for example, by averaging facets instead of using the highest — that is a legal error you can challenge through a Higher-Level Review or Board appeal. The Win Your VA Disability Claim guide covers how to identify and challenge rating errors like this.

The Bottom Line

TBI claims are won or lost on documentation. Know your ten facets before you walk into that exam. Document specific examples of how each area of impairment affects your daily life. And if the rating comes back low, do not accept it as final — get a private evaluation and fight it.