Diagnostic Code 8015 · 38 CFR §4.124a
Tabes dorsalis is the most distinctive form of late neurosyphilis — a slowly progressive degeneration of the posterior columns and dorsal roots of the spinal cord that develops 15 to 30 years after the original untreated syphilis infection. The clinical picture includes severe lancinating "lightning" pains in the legs and trunk, loss of position sense and vibration sense, ataxia with a wide-based unsteady gait (the classic "stamping" gait), absent deep tendon reflexes in the legs, Argyll Robertson pupils (small, irregular pupils that constrict to near vision but not to light), bladder dysfunction, and visceral pain crises. Like the other neurosyphilis codes, tabes dorsalis is rare in modern military populations because of routine screening and penicillin treatment, but DC 8015 remains in 38 CFR §4.124a to cover legacy cases and former POW cases under 38 CFR §3.309(c) presumptives. The condition is typically diagnosed late in its course when permanent neurological damage has already occurred, and penicillin treatment can halt progression but rarely reverses existing deficits.
| Rating | Criteria |
|---|---|
| 30% | Minimum schedular evaluation for any confirmed tabes dorsalis diagnosis, regardless of current symptom severity. The minimum reflects the progressive nature of the disease and the typical pattern of chronic residuals. |
| 60% | Moderate residuals — definite sensory ataxia, lancinating pain controlled by neuropathic pain medication, loss of position sense and vibration sense, bladder dysfunction, with measurable functional limitation in daily activity. |
| 80% | Severe residuals — marked ataxia limiting independent ambulation, severe refractory lancinating pain, significant bladder dysfunction requiring intermittent catheterization, visual impairment from optic atrophy, OR functional impairment severe enough to prevent independent activities of daily living. |
| 100% | Total impairment — inability to ambulate independently, complete sensory loss in the lower extremities, requirement for aid and attendance, severe visceral pain crises, OR catastrophic combined neurological residuals. Special Monthly Compensation applies based on the specific functional losses (loss of use of lower extremities, requirement for aid and attendance). |
Serology (RPR/VDRL with confirmatory FTA-ABS or TP-PA) and CSF analysis with positive CSF VDRL establish neurosyphilis. The clinical examination findings characteristic of tabes — Argyll Robertson pupils, loss of position and vibration sense, sensory ataxia, absent ankle and knee reflexes, Romberg sign — together support the diagnosis. MRI of the spinal cord may show posterior column atrophy in advanced cases. Penicillin treatment records confirm therapy. Service medical records establishing in-service syphilis exposure support direct service connection; POW status records support the presumptive pathway.
Tabes dorsalis is rare today because of routine syphilis screening and effective penicillin treatment, but it has not disappeared. Cases continue to occur in veterans who had untreated or inadequately treated syphilis decades ago, in immunocompromised patients, and occasionally in resource-limited settings where the original infection was not adequately treated. The DC 8015 code remains in 38 CFR §4.124a because the long latency means new diagnoses continue to surface in older veterans.
Penicillin halts the active infection and prevents further posterior column degeneration, but it does not reverse damage that has already occurred. The neurological deficits present at the time of treatment generally persist as permanent residuals. Some patients experience modest improvement over the first year of treatment; most reach a plateau thereafter. The rating reflects the steady-state residuals.
Charcot joints (neuropathic arthropathy) are progressive joint destruction caused by loss of pain and proprioception. In tabes dorsalis, the knees are most commonly affected, but hips, ankles, and the spine can also be involved. The destruction can be dramatic — gross deformity, swelling, instability — but it is often painless because of the underlying sensory loss. Charcot joints are rated separately under the affected joint code (DC 5256 ankylosis of knee, etc.) and produce a higher combined rating when claimed as secondary to the underlying tabes dorsalis.