Paralysis of the sciatic nerve, the rating code that covers most lower-body radiculopathy, is the third most common service-connected disability in the country. Just over two million veterans, roughly one in three of everyone on the Department of Veterans Affairs' (VA) compensation rolls, carry a rating under that single code. Migraine claims are smaller in total but growing at a similarly fast pace.
Together, sciatic nerve paralysis and migraine are the two named conditions driving most of the recent growth in VA neurological disability claims. Both are covered in detail below, along with the general rules VA uses to rate nerve damage and a practical breakdown of how filing radiculopathy as a primary condition differs from filing it as secondary to an already-rated back injury.
Radiculopathy Tops VA's Named Neurological Disability List
Paralysis of the sciatic nerve accounts for more disability claims than any other named nerve condition VA tracks. The VA's fiscal year 2025 Annual Benefits Report ranks it third among all service-connected disabilities, behind only tinnitus and limitation of knee flexion. Just over two million veterans, 2,026,583 in VA's own count, carry a rating under this single diagnostic code.
That single category is larger than post-traumatic stress disorder (PTSD), which affects 1,760,497 veterans, and hearing loss, which affects 1,690,837. Only tinnitus, at 3,583,295 veterans, and limitation of knee flexion, at 2,312,985, outrank it.
Radiculopathy and Migraine Are Outgrowing the Overall Caseload
Radiculopathy and migraine claims are both outgrowing VA's overall compensation caseload. The clearest evidence comes from comparing the agency's two most recent Annual Benefits Report editions, one covering fiscal year 2024 and one covering fiscal year 2025.
| Metric | FY2024 Report | FY2025 Report | Change |
|---|---|---|---|
| All veterans receiving compensation | 5,992,967 | 6,338,253 | +5.8% |
| Rated for paralysis of the sciatic nerve | 1,745,314 | 2,026,583 | +16.1% |
| Rated for migraine | 1,109,254 | 1,300,172 | +17.2% |
Both nerve-related categories grew roughly three times faster than the compensation rolls as a whole. Migraine claims grew a bit faster, 17.2% against 16.1%, though sciatic nerve paralysis still carries far more total claims: 2,026,583 versus 1,300,172.
New-recipient counts, meaning veterans granted compensation for the first time that year, tell the same story. New sciatic nerve claims rose from 86,121 to 92,947, and new migraine claims rose from 83,992 to 93,922, while total new recipients grew just 4.1%, from 457,919 to 476,802.
What VA's Own Data Doesn't Show
VA's published tables undercount radiculopathy's true reach. They track only one nerve. Paralysis of the sciatic nerve is the code VA uses for most lower-back radiculopathy, but several other nerves carry the same kind of damage.
Femoral nerve damage, cervical radiculopathy in the arms, and peripheral neuropathy from other causes all get rated too. None of them show up in the top-ten list above.
The published counts are also a snapshot of who is currently rated, not a record of how many claims VA received or denied in a given year. A veteran who dies, has a rating reduced, or drops a claim on appeal disappears from the count the same way a newly approved veteran adds to it. The year-over-year change is a net figure, not a count of new filings.
Neither report explains why radiculopathy and migraine claims are growing faster than the rest of the caseload. VA does not publish a cause alongside the count. An aging veteran population, more secondary filings, and broader awareness of these conditions are all plausible contributors, but the data doesn't isolate any one of them.
VA Rates Nerve Damage Under One Shared Set of Rules
VA rates most nerve damage under 38 CFR Part 4, the section of the Code of Federal Regulations that sets VA's disability rating schedule, specifically the rules for paralysis, neuritis, and neuralgia. Each affected nerve gets its own diagnostic code, and each code sets a maximum rating for complete paralysis of that nerve, with lower tiers for mild, moderate, and severe incomplete paralysis. Neuritis, meaning nerve inflammation, is rated the same way as paralysis.
Neuralgia, meaning nerve pain without measurable loss of function, is capped at the moderate incomplete-paralysis rate, even when the pain itself is severe. A dedicated lower-extremity radiculopathy rating guide and upper-extremity radiculopathy rating guide cover the full percentage tables for each nerve, from the sciatic nerve in the leg to the ulnar and median nerves in the arm. A third guide covers sciatica specifically, since sciatic nerve claims make up the largest share of the category.
Migraine and TBI Ratings Use Different Rules Than Radiculopathy
Migraine and traumatic brain injury (TBI) residuals are rated under separate diagnostic codes from radiculopathy, with their own severity scales. Migraine is rated under diagnostic code 8100, based on how often a veteran has a prostrating attack, meaning one severe enough to force bed rest or a stop to all activity. A rating of 50%, the highest schedular rating available, requires very frequent, completely prostrating, and prolonged attacks that cause severe economic hardship.
TBI residuals use a different system entirely, a ten-facet evaluation that does not average the facets together. VA scores each of the following on its own scale, then bases the overall rating on whichever facet scores worst:
- Memory, attention, and executive function
- Judgment
- Social interaction
- Orientation
- Motor activity
- Visual-spatial orientation
- Subjective symptoms, such as headache or dizziness
- Neurobehavioral effects, such as irritability or impulsivity
- Communication
- Consciousness
Whichever facet scores worst sets the whole rating: 10%, 40%, 70%, or 100%. VA does not add the ten facets together or average them.
Filing Radiculopathy as Secondary Usually Needs Less New Evidence
Radiculopathy can be filed two different ways, and each path asks for different evidence. Filed as a secondary condition, radiculopathy is linked to a condition VA already rates, most often a lumbar or cervical spine injury. Filed as a primary condition, radiculopathy is tied directly to an in-service event, such as a nerve injury from trauma, with no back condition required.
| Filed as Secondary | Filed as Primary | |
|---|---|---|
| What must already be on record | A service-connected back or neck condition | Nothing; the nerve injury stands on its own |
| What the nexus letter must show | The nerve damage was caused or worsened by the already-connected condition | The nerve damage traces to an in-service event, injury, or exposure |
| Typical evidence | EMG or nerve conduction results, reduced reflexes, a positive straight-leg-raise test | Service treatment records documenting the injury, plus the same clinical findings |
| Rating outcome | A separate rating added on top of the back condition's rating | A standalone rating with no dependency on another claim |
| Best fit when | A back or neck condition is already service-connected | The nerve damage came from something other than the spine, or no spine claim exists |
The practical difference shows up fastest in a claim that gets denied. A secondary claim denied for a missing nexus can often be refiled once a new opinion addresses that single gap, since the underlying back condition is already proven. A primary claim denied for lack of an in-service event usually needs new service records or lay evidence of the injury itself, a harder gap to close.
What This Means for Your Claim
What we see readers get wrong most often is treating a service-connected back condition as automatic proof of radiculopathy. A rating for the spine and a rating for the nerve are two separate line items, and VA does not add the second one just because the first one exists. In the guides we publish here, that gap is the first thing worth checking.
Pull the rating decision letter and look for a radiculopathy line next to the spine rating. If there is not one, and a doctor's note or an EMG documents nerve involvement, that gap is worth a new secondary claim rather than an appeal of the existing rating. A nexus letter tying those nerve findings to the already-rated back condition is usually the one piece of evidence that turns a missed rating into an approved VA neurological claim.