TBI, Parkinson's vs Migraines: What the Board Treats Differently

When you think "neurological conditions," you might picture a single category where the VA evaluates claims in roughly the same way. Same body system, same general expertise required, similar outcomes. That's what I assumed before I started pulling the numbers.

But when I looked at how the Board of Veterans' Appeals actually decides neurological cases — TBI, Parkinson's, migraines, neuropathy, and epilepsy — the differences were pretty stark. Grant rates range from 22.4% to 40.7% across these five conditions, denial rates swing by 25 percentage points, and remand patterns tell their own story. These aren't small variations. Something is happening differently in how the Board evaluates each of these, and the data paints an interesting picture of what that looks like.

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TL;DR

• Migraines had the highest grant rate at 40.7%, while epilepsy had the lowest at 22.4% — nearly double the success rate for migraines despite both being neurological conditions.
• TBI had the highest denial rate at 51.0%, more than double the denial rate for migraines (25.5%). Over half of TBI cases that reach the Board get denied.
• Neuropathy and epilepsy had the highest remand rates (40.0% and 40.4%), suggesting the Board frequently finds those cases aren't ready for a final decision.
• Parkinson's sits in the middle on grants (38.2%) but has a notably low denial rate (30.8%) combined with a high remand rate (30.9%).
• The data covers 4,962 total BVA decisions across these five conditions — enough to see real patterns, not noise.

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The Numbers Side by Side

Here's the full comparison across all five neurological conditions. I find it's easier to see the divergences when everything's in one place.

A few things jump out immediately. TBI has by far the most cases — 2,196 — which makes sense given the prevalence of TBI claims across all service eras. But having the most cases doesn't translate to the best outcomes. TBI's 51.0% denial rate is the highest in this group by a wide margin. More than half the TBI cases that make it all the way to the Board end in denial.

Compare that to migraines at 25.5% denied or Parkinson's at 30.8% denied. The gap between TBI and migraines on denials is 25.5 percentage points. That's not a rounding error.

The report-level data across 711 neurological cases showed an average grant rate of 33.2%, which gives useful context — TBI, neuropathy, and epilepsy all fall below that average, while Parkinson's and migraines sit above it.

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The TBI Problem: High Volume, High Denial

TBI stands out as the condition where the Board says "no" most often. At 51.0% denied, it's the only condition in this group where more than half the cases result in denial. For comparison, the next highest denial rate is epilepsy at 37.2% — still high, but 13.8 percentage points lower than TBI.

I don't know exactly why TBI denial rates are so elevated compared to other neurological conditions, but there are a few possibilities worth considering.

First, TBI diagnosis itself is complicated. Unlike migraines — where symptoms are relatively straightforward to document — TBI exists on a spectrum from mild concussive events to severe traumatic injuries. The Board has to evaluate whether a TBI actually occurred in service, what severity it was, and whether current symptoms are attributable to that event versus other causes. That's a lot of decision points where a claim can fall apart.

Second, TBI has significant symptom overlap with other conditions, particularly PTSD and other mental health diagnoses. A veteran with memory issues, headaches, irritability, and sleep problems could be presenting TBI residuals, PTSD symptoms, or both. When the Board can't clearly delineate what's causing what, that ambiguity seems to work against the veteran more often than not — at least based on the denial numbers.

Third, TBI's remand rate is the lowest in the group at 20.6%. That's interesting because it means the Board feels more confident making final decisions on TBI cases rather than sending them back for more development. But given the denial rate, that confidence seems to skew toward denying rather than granting. The Board looks at TBI cases and more often concludes "we have enough information to decide, and the answer is no."

Contrast that with neuropathy (40.0% remanded) and epilepsy (40.4% remanded), where the Board much more frequently decides it doesn't have enough evidence to make a call at all.

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Migraines and Parkinson's: Why the Board Says Yes More Often

On the other end of the spectrum, migraines (40.7% granted) and Parkinson's (38.2% granted) are the two conditions where the Board most frequently rules in the veteran's favor.

Migraines: The Clearest Path

Migraines had the highest grant rate and the lowest denial rate in this group — 40.7% and 25.5% respectively. That combination is notable. It's not just that migraines win more; they also lose less.

I found this pattern interesting because migraines, in many ways, are the most "documentable" neurological condition on this list. They have clear diagnostic criteria, they're common across all service eras, and the connection between service and onset is often relatively straightforward to establish — a veteran either started getting migraines during or after service, and medical records tend to capture that.

The 33.7% remand rate for migraines suggests the Board still finds evidentiary gaps in about a third of cases. But when the evidence is there, migraines seem to clear the bar more consistently than other neurological conditions.

Parkinson's: Low Denial, High Remand

Parkinson's tells a slightly different story. Its 38.2% grant rate is close to migraines, but the distribution between denials and remands is different. Parkinson's has a 30.8% denial rate paired with a 30.9% remand rate — almost identical numbers, which is unusual.

What this suggests is that when the Board looks at Parkinson's cases, it's less likely to outright deny the claim compared to TBI or epilepsy. Instead, it either grants or sends the case back for more evidence. Whether that's because Parkinson's has stronger presumptive connections for certain service eras, or because the diagnostic evidence tends to be clearer, or because the Board treats degenerative conditions with more caution — I'm not sure. But the pattern is consistent: Parkinson's cases that reach the Board are less likely to hit a hard "no."

It's also worth noting that Parkinson's has a presumptive connection to Agent Orange exposure for Vietnam-era veterans, which could be influencing these numbers significantly. Cases with presumptive service connection have a different evidentiary burden, and that likely contributes to the lower denial rate. But the data I have here doesn't break out presumptive versus direct connection claims, so I can't say definitively how much of the grant rate advantage comes from presumptive claims versus other factors.

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The Remand Gap: Neuropathy and Epilepsy

Neuropathy and epilepsy share something in common that separates them from the other three conditions: extremely high remand rates. Neuropathy at 40.0% and epilepsy at 40.4% — meaning roughly 4 out of every 10 cases get sent back without a final decision.

That's a fundamentally different Board experience. If you have a TBI case, the Board is more likely to give you a definitive answer (even if it's often "no"). If you have neuropathy or epilepsy, there's nearly a coin flip's chance the Board will decide it needs more information before it can rule at all.

Neuropathy: Low Denial, Low Grant, High Uncertainty

Neuropathy has an unusual profile. Its 25.1% grant rate is the second lowest in the group, but its 25.5% denial rate is tied with migraines for the lowest. The dominant outcome for neuropathy is the remand — the Board saying "we can't decide yet."

I'm not sure what to make of that, honestly. One possibility is that neuropathy's diagnosis and service connection are genuinely harder to pin down. Peripheral neuropathy can develop from multiple causes — diabetes, toxic exposures, injuries, idiopathic factors — and establishing which cause is service-connected requires specific medical evidence that might not be in the record. The Board may be sending these cases back for clarifying medical opinions more often than it does for conditions with cleaner diagnostic pictures.

Epilepsy: Low Grant, High Denial, High Remand

Epilepsy has the lowest grant rate in the group at 22.4%, combined with a 37.2% denial rate and a 40.4% remand rate. That means fewer than 1 in 4 epilepsy cases get granted at the Board level, and the rest are split almost evenly between denials and remands.

The 40.4% remand rate — the highest in the group — suggests the Board frequently finds epilepsy cases aren't fully developed. But unlike neuropathy (where the denial rate is low), epilepsy still gets denied at 37.2%, indicating that even when the Board does feel it has enough evidence, the answer is often unfavorable.

This combination of low grants, moderate denials, and high remands makes epilepsy arguably the most difficult neurological condition at the Board level in this dataset. Veterans with epilepsy claims seem to face both evidentiary complexity and an uphill battle on the merits.

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What the Patterns Suggest

Looking at these five conditions together, a few broader observations emerge.

Diagnostic clarity seems to matter. Conditions where the diagnosis and service connection are more straightforward — like migraines — tend to have higher grant rates and lower denial rates. Conditions with complex etiology or significant symptom overlap with other diagnoses — like TBI and epilepsy — tend to fare worse.

High remand rates aren't necessarily bad news. Neuropathy and epilepsy have the highest remand rates, but a remand isn't a denial. It's the Board saying the case needs more development, which means another chance. Veterans with neuropathy cases, for instance, face only a 25.5% denial rate — the Board is much more likely to remand than to deny outright.

TBI's combination is the hardest. A 51.0% denial rate with only a 20.6% remand rate means the Board is both confident in its TBI decisions and frequently deciding against the veteran. The low remand rate means fewer second chances compared to conditions like neuropathy or epilepsy.

Volume doesn't predict outcomes. TBI has 4 times the case count of epilepsy (2,196 vs 500) but a higher denial rate. Having more cases at the Board doesn't mean those cases are stronger — it likely just means more veterans file TBI claims.

Whether these patterns reflect differences in the medical evidence veterans bring to the Board, differences in how the Board evaluates each condition, or some combination of both, the data alone can't tell me. But the variation is real and consistent across a large sample.

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Bottom Line

Neurological conditions are not a monolith at the Board. Migraines and Parkinson's have meaningfully higher grant rates and lower denial rates than TBI, neuropathy, and epilepsy. TBI in particular stands out with a 51.0% denial rate — the highest in this group by a wide margin — while migraines lead with a 40.7% grant rate. The remand patterns add another layer: neuropathy and epilepsy cases get sent back about 40% of the time, while TBI cases almost never do.

These differences matter because they suggest the Board's evidentiary bar isn't uniform across neurological conditions. What counts as sufficient evidence for a migraine claim may look very different from what's needed for a TBI or epilepsy claim. Understanding where your specific condition falls in these patterns — and what the Board tends to look for in that condition — is the kind of context that's hard to get from generic VA disability guides.

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Methodology And Limitations

• Data source: BVA decision analysis from the Claim Raven case database.
• Total cases analyzed: 4,962 across five neurological conditions (TBI: 2,196; Parkinson's: 892; Migraines: 869; Neuropathy: 505; Epilepsy: 500).
• Report-level cross-condition data: 711 cases with an average grant rate of 33.2%.
• Outcomes tracked: Granted, denied, and remanded percentages for each condition.
• Limitations: This data represents cases that reached the Board of Veterans' Appeals — these are appeals, not initial claims. Veterans who were granted at the regional office level aren't in this dataset, which means these numbers likely skew more negative than the overall claim experience. Case counts vary significantly across conditions (TBI has 4x the cases of epilepsy), which could affect the stability of smaller-sample results. The data does not break out connection types (direct, secondary, presumptive), evidence quality, or service era — all of which could explain some of the variation between conditions. Remand outcomes (what happened after the Board sent the case back) are not tracked here.
• Approach: Straight comparison of outcome distributions across conditions within the same body system. No statistical significance testing was applied — these are observed patterns in the dataset as it exists.

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Disclaimer

I'm not accredited by VA, not a lawyer, not a VSO. This is data analysis, not claim advice. These are patterns from cases that made it to the BVA - they don't predict individual outcomes. If you need help with your claim, work with an accredited representative.