ICD-10 Code L66.12 – Frontal Fibrosing Alopecia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L66.12 – Frontal fibrosing alopecia
What it is
Frontal fibrosing alopecia is a scarring hair loss disorder that typically affects the front hairline and temples. It is a form of cicatricial alopecia, meaning damaged follicles are replaced by scar tissue.
Clinical signs
Common findings include a receding frontotemporal hairline, loss of eyebrow hair, and smooth shiny scalp where follicles are absent. Clinical features vary; refer to documentation.
When to use this code
Use L66.12 when the provider documents frontal fibrosing alopecia, including cases described as scarring alopecia with frontal hairline recession. Use it when the diagnosis is confirmed clinically or by dermatology assessment. Check documentation if the note only says nonscarring hair loss or alopecia without a subtype.
Do not use for
Do not use this code for patchy nonscarring alopecia, androgenetic hair loss, or unspecified alopecia. Check documentation when the record does not clearly identify frontal fibrosing alopecia.
Coding tip
Code the documented subtype exactly; if the provider names scarring alopecia but not frontal fibrosing alopecia, query for clarification.