How does the VA rate migraine headaches, and what do I need to prove service connection?

Migraines are rated under 38 CFR 4.124a, Diagnostic Code 8100. The rating criteria focus on the frequency and severity of prostrating attacks: a 0% rating applies with less frequent attacks, 10% for characteristic prostrating attacks averaging one in two months, 30% for attacks averaging once a month, and 50% for very frequent completely prostrating and prolonged attacks that produce severe economic inadaptability (meaning they significantly interfere with the ability to work, not necessarily that you're unable to work at all). There is no separate rating above 50% under this code, though migraines can sometimes support a claim for a Total Disability rating based on Individual Unemployability (TDIU) if they prevent substantially gainful employment.

For rating purposes, documentation matters a great deal. A longitudinal record from a neurologist showing frequency, duration, triggers, and functional impact (missed work, need for a dark/quiet room, medication use like Emgality or triptans) is exactly the kind of evidence VA raters look for. The C&P examiner's report will typically ask about how many prostrating attacks you have per month and how they affect work and daily activities, so consistency between your medical records, your C&P exam statements, and any personal or buddy statements strengthens the claim.

Service connection is often the harder hurdle, as you noted. It can be established directly (an in-service event, injury, or diagnosis, plus a current diagnosis, plus a medical nexus linking the two), or secondarily if migraines developed or worsened because of an already service-connected condition (for example, some veterans connect migraines to TBI, cervical spine issues, PTSD, or medication side effects). If your migraines are tied to hypertension, that relationship would need its own medical nexus opinion, since blood pressure and headache disorders are not automatically linked. A strong nexus statement from your treating neurologist explicitly addressing the connection to service (or to a service-connected condition) is often what separates a grant from a denial or remand.

At the Board of Veterans' Appeals, across issues decided from 1992 to July 2026, service-connection issues (2,302,001) came out 18.8% granted, 30.2% denied and 45.7% remanded (VetAid's Board outcome rates). These are outcomes for cases that were already appealed, not the odds of winning an initial claim, and appealed cases are not a random sample of all claims.

While waiting for your rating decision, request a copy of your C&P exam report through your VA claims file (eBenefits or the VA.gov claim status page) once available, so you can review it for accuracy and, if needed, submit a supplemental claim with new nexus evidence.