ICD-10 Code L66.89 – Other Cicatricial Alopecia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L66.89 – Other cicatricial alopecia
What it is
Use this code for scarring hair loss that does not fit a more specific cicatricial alopecia diagnosis. The term indicates permanent follicle damage with loss of hair in affected areas.
Clinical signs
Typical findings include patchy hair loss with visible scalp scarring, loss of follicular openings, and signs of prior inflammation. Clinical features vary; refer to documentation.
When to use this code
Use L66.89 when the provider documents cicatricial alopecia but does not name a more specific subtype. It also fits cases described as scarring alopecia with an unspecified or other cause. Check documentation when the record mentions a related disorder or mixed diagnosis.
Do not use for
Do not use this code for nonscarring hair loss, such as alopecia areata or telogen effluvium. If a more specific cicatricial alopecia diagnosis is documented, code that condition instead.
Coding tip
Look for the exact provider wording and code the most specific scarring alopecia documented.