L66.8Other cicatricial alopecia

L66.8 is the ICD-10-CM diagnosis code for other cicatricial alopecia. It belongs to category L66 (cicatricial alopecia [scarring hair loss]), block L60-L75 (disorders of skin appendages) and chapter 12 (diseases of the skin and subcutaneous tissue). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within L66, choose L66.8 (Other cicatricial alopecia) only when documentation doesn't support a more specific option: Pseudopelade (L66.0), lichen planopilaris (L66.1), Folliculitis decalvans (L66.2), Perifolliculitis capitis abscedens (L66.3), Folliculitis ulerythematosa reticulata (L66.4) and cicatricial alopecia, unspecified (L66.9).

To report this condition, pick the subcode that matches the documentation: L66.81 (alopecia) and L66.89 (alopecia).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2025 (expanded into subcodes).

Before ICD-10, this condition was coded in ICD-9-CM as 704.09 (other alopecia).