L66.1 is the ICD-10 code for Lichen planopilaris. It is a four-character subcategory of L66 (Cicatricial alopecia [scarring hair loss]), the most specific level in the WHO edition. It belongs to the block L60–L75 (Disorders of skin appendages) in Chapter XII, Diseases of the skin and subcutaneous tissue.
- Code type
- Subcategory (4 characters)
- Chapter
- XII · L00–L99
- Classification
- WHO ICD-10, 2019 version
What L66.1 includes
Conditions and terms that are coded here.
- Follicular lichen planus
L66.1 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
L66.1Lichen planopilaris
L66.1Lichen planopilaris
DL661Lichen planopilaris
L66.1Lichen planopilaris
L66.1Lichen planopilaris
L66.1Lichen planopilaire
L66.1lichen planopilaris
Listed through more specific codes:
- L66.10Lichen planopilaris, unspecified
- L66.11Classic lichen planopilaris
- L66.12Frontal fibrosing alopecia
- L66.19Other lichen planopilaris
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
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