Lumbar Radiculopathy / Sciatica Secondary to Lumbar Spine Injury / Degenerative Disc Disease

Yes. Under 38 CFR § 3.310(a), any disability proximately caused or chronically worsened by a service-connected condition is itself service-connected. Lumbar Radiculopathy / Sciatica is a documented secondary pairing for Lumbar Spine Injury / Degenerative Disc Disease with strong medical evidence. A nexus letter from a qualified physician linking the two conditions is the most reliable way to establish this connection.

The gold standard is a private nexus opinion stating — to at least a 50% probability ("at least as likely as not") — that the secondary condition was caused or aggravated by the primary service-connected condition. Peer-reviewed medical literature supporting the physiological mechanism strengthens the nexus. Treatment records documenting the onset or worsening of the secondary condition in temporal relation to the primary are supporting evidence.

The VA rates Lumbar Radiculopathy / Sciatica separately under its own 38 CFR Part 4 diagnostic code, then combines it with Lumbar Spine Injury / Degenerative Disc Disease and all other service-connected ratings using the combined ratings formula under § 4.25. The formula applies the whole-person concept: a 50% combined existing rating plus a new 30% rating yields 65% (rounded to 70%), not 80%.

38 CFR § 3.310(a) states: "Disability which is proximately due to or the result of a service-connected disease or injury shall be service connected." The aggravation variant under § 3.310(b) applies where the primary condition permanently worsens a pre-existing disability beyond its natural progression. Both standards require a showing of nexus — a medical or scientific link between the primary condition and the secondary.

The medical evidence supporting Lumbar Radiculopathy / Sciatica as secondary to Lumbar Spine Injury / Degenerative Disc Disease is rated strong. Lumbar disc herniation, disc protrusion, or vertebral foraminal stenosis secondary to degenerative disc disease causes mechanical compression or chemical irritation of nerve roots exiting the spinal canal. This is a direct anatomical consequence of lumbar spine pathology — the same disc that herniates from military-related lifting injuries or repetitive spinal loading mechanically compresses the L4, L5, or S1 nerve root, producing dermatomal pain, paresthesia, and weakness in the lower extremity. The VA rates lumbar radiculopathy separately from the underlying back condition under the affected peripheral nerve diagnostic codes (sciatic nerve: 8520; femoral nerve: 8525).

The VA will not solicit nexus evidence on your behalf for secondary claims. In practice, a written nexus opinion from a private physician or independent medical examiner is essential — the VA's Compensation & Pension (C&P) examiner is not required to produce a favorable nexus opinion, and the VA has discretion to weigh competing opinions. Submitting a private nexus letter at the time of filing is the most reliable strategy.