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 2026, 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.
Lipedema
Disorder of adipose tissue characterized by symmetric and bilateral enlargement of the lower extremities due to abnormal deposition of SUBCUTANEOUS FAT often in obese women. It is associated with HEMATOMA, pain and may progress to secondary LYMPHEDEMA which is known as lipolymphedema.
About the L66 Code Range
ICD-10 code L66 covers cicatricial alopecia, a group of conditions causing permanent scarring hair loss. These codes help identify various types of scarring alopecia, including specific forms like lichen planopilaris and folliculitis decalvans, providing precise classification for treatment and documentation.
The ICD-10 code for cicatricial alopecia includes subcategories such as L66.0 for Pseudopelade, and L66.1 for lichen planopilaris, which also covers related terms like eczema of the scalp and frontal fibrosing alopecia. L66.2 codes for folliculitis decalvans, a scarring inflammation of hair follicles. Other notable codes include L66.3 for perifolliculitis capitis abscedens and L66.4 for folliculitis ulerythematosa reticulata, linked to keratosis pilaris variants. L66.81 identifies central centrifugal cicatricial alopecia, while L66.89 includes scarring alopecia due to infectious diseases or conditions like lepromatous scarring alopecia. Unspecified scarring hair loss falls under L66.9, encompassing causes like radiation alopecia or post-traumatic scarring. These codes specifically guide coding professionals in distinguishing types of scarring hair loss for accurate diagnosis and treatment planning.
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, 2025 through September 30, 2026. 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 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
