Cicatricial alopecia [scarring hair loss] (L66) ICD-10-CM
The L66 code range covers cicatricial alopecia [scarring hair loss] with 14 ICD-10-CM diagnosis codes. 11 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Codes in the L66 Range 14 codes · 11 billable
- L66 Cicatricial alopecia [scarring hair loss]Non-billable
- L66.0 Pseudopelade
- L66.1 Lichen planopilarisNon-billable
- L66.10 Lichen planopilaris, unspecified
- L66.11 Classic lichen planopilaris
- L66.12 Frontal fibrosing alopecia
- L66.19 Other lichen planopilaris
- L66.2 Folliculitis decalvans
- L66.3 Perifolliculitis capitis abscedens
- L66.4 Folliculitis ulerythematosa reticulata
- L66.8 Other cicatricial alopeciaNon-billable
- L66.81 Central centrifugal cicatricial alopecia
- L66.89 Other cicatricial alopecia
- L66.9 Cicatricial alopecia, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the L66 range.
Central Centrifugal Cicatricial Alopecia
An inflammatory, scarring form of alopecia characterized by permanent, patchy hair loss that initially presents on the vertex of the scalp and spreads outward.
About the L66 Code Range
Cicatricial alopecia means scarring hair loss. This category sits among disorders of skin appendages.
The subdivisions distinguish named forms, including pseudopelade, folliculitis decalvans, and perifolliculitis capitis abscedens. L66.1 divides lichen planopilaris into classic, frontal fibrosing, other, and unspecified forms. L66.8 separates central centrifugal cicatricial alopecia from other cicatricial alopecia. L66.9 identifies cicatricial alopecia without a specified form.
Questions About This Page
How many billable codes are in the L66 range?
Of the 14 codes in this range, 11 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the L66 range classify?
The range classifies cicatricial alopecia [scarring hair loss]. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
