1B20.21 Type II leprosy reaction

International Classification of Diseases for Mortality and Morbidity Statistics, 11th Revision, v2024-01

This phenomenon, also named downgrading reaction, occurs in borderline leprosy states and is associated with a decrease in cell-mediated immunity with a shift towards the lepromatous end of the clinical spectrum.

postcoordination

synonyms

• Type II leprosy reaction
• Type II downgrading reaction
• Erythema nodosum leprosum
• Lucio phenomenon

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