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6320
§ 4.88b Schedule of ratings—infectious diseases, immune disorders and nutritional deficiencies.

Onchocerciasis (river blindness)

Filarial infection (Onchocerca volvulus) causing river blindness

What the rating means

Onchocerciasis is rated under diagnostic code 6320, which covers parasitic diseases otherwise not specified, found in § 4.88b of VA's rating schedule. VA rates this condition using the General Rating Formula for Infectious Diseases. While the disease is active, the rating is 100%. Once the active disease has resolved, the infection itself is rated at 0%. Any disabilities that remain after the infection — called residuals — are not rated under this code. Instead, they are rated under whichever body system they affect, such as the eyes, skin, or nervous system. This means your overall combined rating can include separate evaluations for each residual condition, each rated under its own appropriate diagnostic code.

Rating levels

  • 100% — For active disease
  • 0% — After active disease has resolved, rate at 0 percent for infection. Rate any residual disability of infection within the appropriate body system.

VA doesn't add ratings together. It combines them using the table in 38 CFR § 4.25, so two ratings usually total less than their sum.

Evidence that helps

To support a 100% rating, medical records showing active onchocerciasis are key — for example, clinical diagnoses, laboratory findings, biopsy results confirming the parasite, or treating physician notes documenting ongoing active infection. Once the active disease has resolved, evidence shifts to the specific residuals you experience. If the infection affected your eyes, eye examination records documenting vision loss or other findings would apply to that body system's rating criteria. If skin or neurological symptoms remain, records from those evaluations would support ratings under those systems. Statements from you or people who know you, describing how remaining symptoms affect your work and daily activities, can help show the severity of any residual disability that medical records alone may not fully capture.

VA exam form (DBQ) for this condition:

Presumptive conditions

If your service meets the rules below, VA presumes this condition is connected to it.

  • Tropical disease — 38 CFR § 3.309(b)
  • Prisoner of war — 38 CFR § 3.309(c)

Secondary conditions

Conditions that are often caused or made worse by this one. If you have any of these, they may be claimable as secondary service connection.