ICD-10 Code L66.19 – Other lichen planopilaris (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L66.19 – Other lichen planopilaris
What it is
L66.19 identifies a scarring hair loss disorder in the lichen planopilaris group when the record specifies another or less common form. Use it for documented cases of inflammatory scalp disease that destroys hair follicles.
Clinical signs
Typical findings include patchy alopecia with perifollicular erythema, scaling, and signs of scarring on the scalp. Clinical features vary; refer to documentation.
When to use this code
Use L66.19 when the provider documents other lichen planopilaris, atypical lichen planopilaris, or a named variant not captured by a more specific code. It is also appropriate when the diagnosis is confirmed and the chart distinguishes it from nonscarring hair loss. Check documentation if the note only says hair loss or alopecia.
Do not use for
Do not use this code for nonscarring alopecia, telogen effluvium, or unspecified hair loss. If the record does not clearly identify lichen planopilaris, check documentation.
Coding tip
Assign the code only when the clinician documents a lichen planopilaris variant or other specified form, not just “alopecia.”