ICD-10-CM Diagnosis Code (2025)
Official Description for L66
Cicatricial alopecia [scarring hair loss]
Coding Notes & Guidelines for L66
Inclusion Terms
Follicular lichen planus
Inclusion Terms
FFA
Inclusion Terms
Lassueur Graham-Little Piccardi syndrome
Inclusion Terms
CCCA
Child Codes (More Specific Codes for L66):
L66.0 - Pseudopelade
L66.1 - Lichen planopilaris
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 alopecia
L66.81 - Central centrifugal cicatricial alopecia
L66.89 - Other cicatricial alopecia
L66.9 - Cicatricial alopecia, unspecified
About ICD-10-CM Code L66 (Cicatricial alopecia [scarring hair loss])
ICD-10-CM code L66 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM L66 became effective on October 1, 2024.
This page provides detailed information about L66 - Cicatricial alopecia [scarring hair loss]. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Cicatricial alopecia [scarring hair loss].