All ICD10 Codes

L66

Non-Billable
ChapterL00–L99
Rankcategory
Official Description

Cicatricial alopecia [scarring hair loss]

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 12: Diseases of the Skin and Subcutaneous Tissue (L00-L99).

CH12 Parent Instructions

Excludes2(Not included here)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • lipomelanotic reticulosis (I89.8)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • viral warts (B07.-)

L60-L75 Parent Instructions

Excludes1(Not coded here)
  • congenital malformations of integument (Q84.-)

Clinical Hierarchy

CH12Diseases of the skin and subcutaneous tissue (L00-L99)
L60-L75Disorders of skin appendages (L60-L75)
L66Cicatricial alopecia [scarring hair loss]
L66.0Pseudopelade
L66.1Lichen planopilaris
L66.2Folliculitis decalvans
L66.3Perifolliculitis capitis abscedens
L66.4Folliculitis ulerythematosa reticulata
L66.8Other cicatricial alopecia
L66.9Cicatricial alopecia, unspecified

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to L66:

blockL60-L75
Disorders of skin appendages (L60-L75)
View context instructions
chapterCH12
Diseases of the skin and subcutaneous tissue (L00-L99)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to L66. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

21 raw paths
Acne1 unique routes
decalvans→L66
Alopecia (hereditaria) (seborrheica)4 unique routes
cicatricial→L66(3 variants)
central centrifugal→L66
specified NEC→L66
frontal fibrosing→L66
Atrophoderma, atrophodermia (of)2 unique routes
reticulatum symmetricum faciei→L66
vermiculata (cheeks)→L66
CCCA (central centrifugal cicatricial alopecia)1 unique routes
Direct index entry→L66
FFA (frontal fibrosing alopecia)1 unique routes
Direct index entry→L66
Folliculitis (superficial)3 unique routes
abscedens et suffodiens→L66
decalvans→L66
ulerythematosa reticulata→L66
Lichen5 unique routes
planopilaris→L66(4 variants)
classic→L66
follicular→L66
specified NEC→L66
planus (chronicus)
follicular→L66
Perifolliculitis2 unique routes
abscedens, caput, scalp→L66
capitis, abscedens (et suffodiens)→L66
Pseudopelade1 unique routes
Direct index entry→L66
Syndrome1 unique routes
Lassueur Graham-Little Piccardi→L66

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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