If you have a rated back condition and pain, numbness, or tingling running down a leg, you are probably owed a second rating you have never been paid for. Sciatica is rated as a nerve condition, separately from the spine, and each affected leg is rated on its own.
The DC 8520 Rating Tiers, Per Leg
Sciatica, medically lumbar radiculopathy, is rated under 38 CFR 4.124a, Diagnostic Code 8520, for paralysis of the sciatic nerve. Every tier below applies to one leg:
| Rating (per leg) | Criteria |
|---|---|
| 80% | Complete paralysis: foot dangles and drops, no active movement possible below the knee |
| 60% | Severe incomplete paralysis with marked muscular atrophy |
| 40% | Moderately severe incomplete paralysis |
| 20% | Moderate incomplete paralysis |
| 10% | Mild incomplete paralysis |
Two legs means two ratings. Veterans with bilateral symptoms who were granted a single 10% are missing an entire second evaluation.
Rating Sciatica On Top of Your Back Is Not Pyramiding
38 CFR 4.14 prohibits rating the same disability under multiple codes, and this is where raters and veterans both get confused. The note to the General Rating Formula for Diseases and Injuries of the Spine directs raters to evaluate any associated objective neurologic abnormalities separately under an appropriate diagnostic code.
The spine formula measures orthopedic limitation of motion. DC 8520 measures neurological impairment of a specific nerve in a specific limb. Different manifestations, different codes, separate ratings. This is the intended outcome, not an exception.
Worked Example With the Bilateral Factor
A veteran has a 20% lumbar strain plus mild sciatica in both legs at 10% each. Because both lower extremities are compensably rated, the bilateral factor under 38 CFR 4.26 applies.
- Combine the two legs: 10% and 10% combine to 19% raw.
- Bilateral factor: 10% of 19 is 1.9. Bilateral subtotal is 20.9%.
- Combine with the 20% spine rating: 20.9 + (20% of the remaining 79.1) = 36.7% raw.
- Round to the nearest 10%: 40%, paying $795.84 per month in 2026.
The spine alone pays $356.66. Adding the radiculopathy more than doubled the monthly payment, and the underlying medical evidence usually already exists in the file.
Mild Versus Moderate: Where the Money Is
The schedule does not define these terms. Where the involvement is wholly sensory, meaning numbness, tingling, and pain with no motor loss, the rating should be for the mild or at most the moderate degree. Moderate generally means more constant symptoms, functional limitation, and early objective findings such as a diminished reflex. Moderately severe at 40% typically requires demonstrable weakness and significant functional loss.
Evidence That Wins a Sciatica Claim
- A documented dermatomal pattern. Symptoms following a specific nerve root distribution, noted in treatment records or the C&P exam.
- Reflex, sensory, or strength findings. Diminished ankle or knee reflexes, reduced light touch or pinprick sensation, measurable weakness.
- A positive straight leg raise test.
- Imaging that corroborates. MRI showing disc herniation or foraminal stenosis at the level matching your symptoms.
- EMG or nerve conduction studies. Not required, but they move a claim from arguable to obvious.
- A lay statement describing frequency, triggers, and functional impact.
Check Your Rating Decision
Pull your decision letter and look for a separate DC 8520 line. If your records mention radiating pain, sciatica, numbness, or tingling in a leg and there is no 8520 line, the neurological component was never rated. That is a claim for increase.