World Health Organization · 2026-01 · English
EC21 Genetic defects of hair or hair growth
Official WHO ICD-11 MMS tabulation. This international classification is separate from US ICD-10-CM. For complete instructions and postcoordination, consult the WHO browser.
More specific codes
EC21.0Genetic defects of the hair shaftEC21.1Genetic syndromes with abnormalities of the hair shaftEC21.2Hereditary alopecia or hypotrichosisEC21.3Genetic syndromes with alopecia or hypotrichosisEC21.4Genetically-determined hypertrichosisEC21.YOther specified genetic defects of hair or hair growthEC21.ZGenetic defects of hair or hair growth, unspecified© World Health Organization · CC BY-ND 3.0 IGO