Neurological Conditions Rating Guide

Neurological conditions cover a wide range, from nerve damage in an arm or leg, to seizures, to migraines, to the lasting effects of a head injury. They look different, but the same schedule (38 CFR § 4.124a) rates almost all of them, and a small set of rules decides how. Understand these five ideas and you can read any neurological rating on the schedule.

1. Nerve conditions are rated on the nerve and the degree of paralysis

A peripheral nerve condition is rated on the specific nerve affected and how complete the paralysis is. Complete paralysis of a nerve carries a set rating for that nerve. Anything less is incomplete paralysis, graded mild, moderate, or severe. Neuritis (an inflamed, painful nerve) and neuralgia (nerve pain without the inflammation) are rated on the same nerve scales. Each nerve, for example the sciatic, median, ulnar, radial, or peroneal, has its own diagnostic code and its own maximum rating, so the nerve involved sets the ceiling before the degree of paralysis sets the level.

2. The rating follows the function lost, not the diagnosis label

What raises a nerve rating is how much function you have lost, not the name of the diagnosis. Sensory-only loss (numbness, tingling, altered sensation) generally caps at a lower level than loss that also includes muscle weakness, wasting, or atrophy. Two veterans with the same diagnosis on paper can land at very different ratings because one has motor loss and the other does not. This is why an exam that documents strength and muscle wasting, not just where it feels numb, matters so much.

3. Seizure disorders are rated by type and frequency over time

Convulsive disorders are rated under epilepsy, grand mal (DC 8910) and petit mal (DC 8911), on the type and frequency of seizures over time. Major (grand mal) and minor (petit mal) seizures are counted separately, because they weigh differently in the schedule. The whole rating stands or falls on frequency, so a reliable, witnessed seizure diary, dates, type, and duration, is what the rating is built on. Seizures are unpredictable and rarely happen in front of an examiner, which is exactly why the written record does the work.

4. Migraine and headaches are rated by how often they are "prostrating"

Migraine and other headaches (DC 8100) are rated by how often "prostrating" attacks occur, meaning attacks that stop you and force you to lie down in a dark, quiet room until they pass. Ordinary headaches you can work through do not drive the rating. The schedule looks at how frequently the prostrating attacks come and how much they interfere with work, so the useful evidence is a dated log of the disabling attacks, not a count of every headache.

5. TBI residuals are rated across facets, highest facet sets the rating

Traumatic brain injury residuals (DC 8045) are rated across three areas of function: cognitive, emotional or behavioral, and physical. The examiner assigns a level to each measurable facet (memory, judgment, social interaction, and so on), and the single highest facet level sets the overall rating. Just as important, any residual that can be separately diagnosed, for example migraines or a mood disorder that grew out of the injury, is rated under its own diagnostic code rather than folded into the TBI rating. This keeps the schedule from double-counting (pyramiding) while making sure every distinct residual is captured.

The rules above apply across the board. For the exact rating levels, the C&P exam, and the Board data for your specific condition, open the dedicated guide:

Most peripheral-nerve codes (the 8510 to 8540, 8610 to 8640, and 8710 to 8740 ranges) rate by incomplete paralysis graded mild, moderate, or severe; seizure disorders sit at 8910 and 8911. For any code not listed, open its condition lookup page for the rating levels and Board data.

Nerve conditions are unusual in that they are just as often the secondary claim as the primary one. A nerve problem frequently traces back to another service-connected condition, and a brain or nerve injury in turn opens the door to further secondary claims:

• Peripheral neuropathy secondary to diabetes. Diabetic nerve damage in the hands and feet is one of the most common secondary claims, flowing from a service-connected diabetes rating.
• Radiculopathy secondary to a spine condition. A service-connected back or neck disability that pinches a nerve root produces radiating leg or arm pain, rated separately under the nerve codes. See the lumbar spine guide and the sciatica guide.
• Depression or anxiety secondary to chronic pain or TBI. Long-term nerve pain and the lasting effects of a head injury drive mental-health conditions, which can be claimed as secondary. See secondary conditions.
• Migraines secondary to TBI or a neck injury. Headaches that begin after a head or neck injury are commonly rated as secondary to that injury under DC 8100.

Each dedicated guide above shows the live Board grant rates for that condition's most common secondary pairings.

• Nerve conduction studies and EMG for neuropathy. These objective tests confirm which nerve is affected and whether the loss is sensory or motor, the finding the whole rating turns on. Without them, a real neuropathy can stay unrated.
• A witnessed seizure log with dates, type (major or minor), and duration. Because seizures rarely happen in front of an examiner, the diary is the record that proves frequency.
• A prostrating-attack headache diary, tracking how often the disabling attacks come and what you cannot do during them, so the examiner can rate the frequency the schedule asks about.
• Neuropsychological testing for TBI, which measures the cognitive facets (memory, attention, judgment) that set the residual rating.
• The matching DBQ for the condition, which prompts the examiner to capture the right findings. See the DBQ guide.