L66
Non-billableCicatricial alopecia [scarring hair loss]
Cicatricial alopecia [scarring hair loss]
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations, and chromosomal abnormalitiesQ00-Q99
- •endocrine, nutritional and metabolic diseasesE00-E88
- •lipomelanotic reticulosisI89.8
- •neoplasmsC00-D49
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
- •systemic connective tissue disordersM30-M36
- •viral wartsB07
Child Codes (7)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(6)
Frequently Asked Questions
What is the ICD-10 code for cicatricial alopecia [scarring hair loss]?
The ICD-10-CM code for cicatricial alopecia [scarring hair loss] is L66. The full clinical description is "Cicatricial alopecia [scarring hair loss]". L66 is a non-billable header code. Use a more specific child code for billing purposes.
What does ICD-10 code L66 mean?
ICD-10-CM code L66 represents “Cicatricial alopecia [scarring hair loss]”. It is classified under Chapter 12: Diseases of the Skin and Subcutaneous Tissue and is a non-billable header code. Use a more specific child code for billing purposes.
Is L66 a billable code?
No, L66 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 7 child codes under L66.
What chapter is L66 in?
L66 is in Chapter 12: Diseases of the Skin and Subcutaneous Tissue (codes L00-L99).
What codes cannot be used with L66?
L66 has Excludes1 notes indicating codes that cannot be used together with it, including: congenital malformations of integument (Q84.-).
What are the subcategories under L66?
L66 has 7 child codes, including: L66.0 (Pseudopelade), L66.1 (Lichen planopilaris), L66.2 (Folliculitis decalvans), L66.3 (Perifolliculitis capitis abscedens), and 3 more.
What are the UMLS CUIs for L66?
L66 is linked to 1 UMLS Concept Unique Identifier: C2936846. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does L66 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like cicatricial alopecia [scarring hair loss] affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of L66?
L66 maps to the ICD-11 code: ED70.5Z (Scarring alopecia of unknown or unspecified aetiology).
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.