Sciatic Nerve Paralysis — VA Disability Rating Criteria (DC 8520)
Diagnostic Code 8520 · 38 CFR §4.124a
What Is It?
The sciatic nerve is the largest nerve in the body, running from the lower spine through the buttock and down the back of each leg. DC 8520 covers incomplete and complete paralysis of this nerve. Veterans commonly develop sciatic nerve conditions secondary to lumbar spine injuries sustained during service. Symptoms include radiating pain down the leg, numbness, tingling, muscle weakness in the leg or foot, and difficulty walking. The VA rates this condition based on the degree of incomplete paralysis — mild, moderate, moderately severe, or severe — or complete paralysis.
Rating Criteria
| Rating | Criteria |
|---|---|
| 80% | Complete paralysis of the sciatic nerve. The foot dangles and drops, there is no active movement possible below the knee, and flexion of the knee is weakened or lost entirely. |
| 60% | Severe incomplete paralysis with marked muscular atrophy. Pronounced weakness, significant sensory loss, and substantial functional impairment. The foot may show evidence of muscle wasting and the veteran may require assistive devices for mobility. |
| 40% | Moderately severe incomplete paralysis. Significant and frequent symptoms including substantial pain, notable muscle weakness, sensory deficits, and meaningful functional limitation. The veteran has difficulty with prolonged standing, walking, or physical activity. |
| 20% | Moderate incomplete paralysis. More persistent symptoms including regular radiating pain, noticeable numbness, and some measurable weakness in the affected leg. Daily activities are noticeably affected but the veteran can still perform most functions. |
| 10% | Mild incomplete paralysis of the sciatic nerve. Symptoms may include intermittent radiating pain, mild numbness or tingling in the leg, and minimal functional limitation. Reflexes and muscle strength are largely preserved. |
Evidence Needed
The VA will look for objective neurological findings on examination. This includes nerve conduction studies (NCS) and electromyography (EMG), which measure the electrical activity of the nerve and muscles. Medical records documenting radiculopathy, muscle atrophy measurements, reflex testing results, and sensory testing are all relevant. If claiming as secondary to a service-connected back condition, you need a medical opinion linking the nerve damage to the spinal condition. Treatment records showing ongoing management with medications like gabapentin or pregabalin support the chronicity and severity of the condition.
C&P Exam Tips
The C&P examiner will test muscle strength in your legs and feet using a 0-5 scale, check reflexes at the knee and ankle, and assess sensation with light touch and pinprick testing. The examiner may ask you to walk on your heels and toes to assess foot strength. Be honest about your worst days — if your symptoms fluctuate, describe the full range. Mention any muscle wasting you have noticed. If you use a cane, brace, or other assistive device, bring it and explain how often you use it. Do not try to power through the strength tests if it causes pain — let the examiner see your actual functional ability.
How to File
If you are claiming sciatic nerve paralysis as secondary to a service-connected back condition, file on VA Form 21-526EZ and clearly identify it as a secondary claim. Include the diagnostic code of your already service-connected back condition. If claiming as a direct service-connection, describe the in-service event or injury that caused the nerve damage. Request or include EMG/NCS results if available. A VSO can help you structure the claim properly.
Common Mistakes
The most common mistake is not claiming radiculopathy separately from a back condition. The spine and the nerves are rated under different diagnostic codes, and you can receive compensation for both. Another mistake is not obtaining EMG or nerve conduction studies — while not strictly required, these objective tests significantly strengthen your claim and help the examiner determine the degree of impairment. Veterans also sometimes fail to report flare-ups or worsening symptoms, accepting a lower rating than their condition warrants.
Frequently Asked Questions
Can I get a separate rating for radiculopathy in addition to my back rating?
Yes. Radiculopathy of the sciatic nerve is rated separately from your lumbar spine condition. The VA recognizes that nerve damage is a distinct disability from the spinal condition causing it. Many veterans with back conditions have associated radiculopathy in one or both legs, each rated independently.
What is the difference between DC 8520 and DC 8620?
DC 8520 covers paralysis (motor and sensory loss) of the sciatic nerve. DC 8620 covers neuritis (inflammation) and DC 8720 covers neuralgia (pain) of the same nerve. Neuritis and neuralgia ratings are generally capped at the incomplete paralysis levels and cannot exceed the rating for moderate incomplete paralysis unless there is organic involvement.
Do I need an EMG to prove sciatic nerve damage?
An EMG is not strictly required, but it provides objective evidence of nerve dysfunction that significantly strengthens your claim. Without it, the rating relies on the clinical exam findings, which can be more subjective. If your condition warrants it, ask your doctor for a referral.