Tabes Dorsalis — VA Disability Rating (DC 8015)

Diagnostic Code 8015 · 38 CFR §4.124a

What Is It?

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 an untreated syphilis infection. The clinical picture includes severe lancinating "lightning" pains in the legs and trunk, loss of position and vibration sense, ataxia with a wide-based unsteady gait, absent deep tendon reflexes in the legs, Argyll Robertson pupils, bladder dysfunction, and visceral pain crises. It is typically diagnosed late in its course, when permanent damage has already occurred; penicillin halts progression but rarely reverses existing deficits. 38 CFR §4.124a opens the neurological schedule with a bracketed instruction: disability from the diseases it lists "may be rated from 10 percent to 100 percent in proportion to the impairment of motor, sensory, or mental function," referring the rater to the appropriate body system of the schedule for each manifestation. Inside the 8000–8025 block the schedule prints either a single flat percentage, a single minimum rating, or no percentage at all — there is no severity ladder anywhere in it. A Note closing the block adds two conditions: the minimum ratings for residuals require ascertainable residuals, and when a rating above the minimum is assigned, the diagnostic codes used as the basis of that evaluation must be cited alongside the code identifying the diagnosis. DC 8015 is one of the codes with an empty rating cell, and it is the one code in the block that spells the consequence out: its Note reads, "Rate upon the severity of convulsions, paralysis, visual impairment or psychotic involvement, etc." The percentage therefore comes from the residuals under their own codes, not from DC 8015.

Rating Criteria

Evidence Needed

Serology (RPR/VDRL with confirmatory FTA-ABS or TP-PA) and CSF analysis with a positive CSF VDRL establish neurosyphilis. The examination findings characteristic of tabes — Argyll Robertson pupils, loss of position and vibration sense, sensory ataxia, absent ankle and knee reflexes, a positive Romberg sign — support the diagnosis. MRI of the spinal cord may show posterior column atrophy in advanced cases. Because the Note sends the rating to the residuals, the evidence that sets the percentage is the residual workup: quantified sensory and motor findings by nerve distribution, urodynamics or a voiding diary where the bladder is involved, ophthalmology testing where optic atrophy is present, and a mental health evaluation where there is psychiatric involvement. Penicillin treatment records confirm therapy; service treatment records establishing the in-service infection support service connection.

C&P Exam Tips

Bring serology, CSF analysis, spinal cord imaging if performed, the neurology consult, and the antibiotic treatment record. Because the Note rates this code on the severity of its residuals, make sure each residual is documented in the terms its own code uses — the sensory loss by distribution rather than as "numbness," the gait abnormality with any assistive device requirement, the bladder symptoms as pad changes or voiding intervals, the visual loss as measured acuity and fields. Describe the impact of lancinating pain on daily function and the response to neuropathic pain medication. Ask that the decision cite the codes used for each residual, as the block's closing Note requires.

How to File

File VA Form 21-526EZ listing tabes dorsalis under DC 8015 and reference 38 CFR §4.124a. List each residual separately — sensory ataxia and lower-extremity sensory loss, bladder dysfunction, optic atrophy, any psychiatric involvement — because the code's own Note rates it on the severity of those residuals and its rating cell is empty. Attach serology, CSF analysis, the neurology consult with detailed examination findings, and the antibiotic treatment records, plus the workup for each residual.

Common Mistakes

Filing without CSF analysis, leaving the diagnosis open to challenge decades after the original infection. Claiming the diagnosis alone and not the residuals, when the code's own Note says the rating is built on the severity of convulsions, paralysis, visual impairment, or psychotic involvement. Missing the Charcot joint claim when sensory loss has produced documented destructive arthropathy. Assuming syphilis is on a presumptive list — it is named in neither §3.309(a) nor §3.309(c), so the nexus runs through the service treatment records.

Frequently Asked Questions

Is tabes dorsalis still seen in modern medicine?

It is rare today because of routine syphilis screening and effective penicillin treatment, but it has not disappeared. Cases continue to occur in veterans whose syphilis went untreated or inadequately treated decades ago and in immunocompromised patients. The long latency is why the code remains in the schedule: new diagnoses still surface in older veterans.

What percentage does DC 8015 pay?

None on its own. Its rating cell in 38 CFR §4.124a is empty, and the Note under it reads: "Rate upon the severity of convulsions, paralysis, visual impairment or psychotic involvement, etc." So the percentage is whatever those residuals earn under their own codes. The section preamble sets the overall range at 10 to 100 percent in proportion to the impairment of motor, sensory, or mental function, and the Note closing the 8000–8025 block requires the codes used as the basis of evaluation to be cited in the decision alongside DC 8015.

What are Charcot joints and how are they rated?

Charcot joints, or neuropathic arthropathy, are progressive joint destruction caused by loss of pain sensation and proprioception. In tabes dorsalis the knees are most commonly affected, though hips, ankles, and the spine can be involved. The destruction can be dramatic — deformity, swelling, instability — and often painless, precisely because of the sensory loss. It is evaluated under the code for the affected joint, and it is one more residual to claim rather than something DC 8015 covers on its own.