Sciatica is one of the most common complications of lumbar disc disease, and it's also one of the most commonly omitted from VA claims. If you have a service-connected back condition and you experience shooting pain down the leg, that symptom pattern likely has a name and a diagnostic code. Filing it as a secondary condition is a straightforward process when you understand the pathway.
Sciatica refers to pain, numbness, or tingling that travels along the sciatic nerve pathway: down the back of the buttock, through the posterior thigh, into the calf, and sometimes into the foot. It's not a diagnosis in the strictest sense but a symptom pattern that usually indicates compression or irritation of one or more lumbar nerve roots, most often at L4-L5 or L5-S1.
The underlying cause in most veterans with lumbar disease is disc herniation or foraminal stenosis pressing on a nerve root. The clinical picture maps directly onto the same anatomy.
"Sciatica" and "lumbar radiculopathy" are often used interchangeably in clinical practice. When a physician documents sciatica, they are describing the symptom. When they document radiculopathy, they may be making a more specific physiological statement about nerve root dysfunction. For VA rating purposes, both conditions are typically rated under the sciatic nerve diagnostic code (DC 8520), and the practical difference between the two terms is small.
What matters for the claim is that the leg symptoms are documented, attributed to the lumbar condition, and rated under the appropriate diagnostic code.
Secondary service connection under 38 CFR 3.310 allows a veteran to receive benefits for a condition that is caused by or aggravated by an already service-connected disability. You don't need a new in-service event. You need:
When the imaging (MRI or CT) shows a disc herniation or foraminal narrowing at the same level as the sciatic symptoms, the nexus opinion is relatively direct. The physician notes the structural finding, notes the clinical presentation, and states that the sciatica is at least as likely as not caused by the service-connected lumbar pathology.
The sciatic nerve is rated under DC 8520, with the following percentage milestones for the sciatic nerve (one leg):
Bilateral sciatica generates two separate ratings, one for each leg, which then combine with the primary back rating and any other conditions in the combined ratings calculation.
Veterans sometimes undersell their symptoms because "moderately severe" sounds like it should mean something dramatic. In clinical terms, moderately severe sciatic involvement includes:
If your symptoms include any of these findings, the 10% rating for "mild" is likely an underassignment.
If you have a sciatica or radiculopathy claim pending and a C&P exam scheduled, the following documentation steps improve your outcome:
Bring these notes to the exam. Examiners move quickly, and a prepared veteran who answers specifically gets a more accurate record.
There are two common failure points. First, veterans focus almost exclusively on the back pain itself during C&P examinations and forget to describe the leg symptoms until they leave the room. Second, some veterans have had sciatica so long they consider it part of the back pain and don't think to separate it.
For the C&P exam, describe your leg symptoms in detail: how often they occur, how far down the leg they travel, whether they wake you up, whether they affect your ability to stand, walk, or perform certain activities.
Adding sciatica as a secondary condition to a service-connected back claim is one of the highest-yield steps a veteran can take to improve their combined rating. Flat Rate Nexus offers physician-signed nexus letters that address both the primary back condition and secondary nerve involvement. Learn more at flatratenexus.com/back-pain.html.
Thinking about your own claim? Every nexus letter we write goes through a full physician record review, cites peer-reviewed research, and is built around the actual evidence in your case.
Start My Nexus Letter