All ICD10 Codes

L66

Non-Billable
ChapterL00–L99
Rankcategory
Official Description

Cicatricial alopecia [scarring hair loss]

Use a more specific code (5 billable, 2 non-billable)
L66.0PseudopeladeL66.1Lichen planopilarishas subcodesL66.2Folliculitis decalvansL66.3Perifolliculitis capitis abscedensL66.4Folliculitis ulerythematosa reticulataL66.8Other cicatricial alopeciahas subcodesL66.9Cicatricial alopecia, unspecified
Metadata & Insights
  • •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. Code separately if applicable.)
  • 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. Use a different code.)
  • congenital malformations of integument (Q84.-)

Clinical Hierarchy

BillableHas subcodes
CH12Diseases of the skin and subcutaneous tissue (L00-L99)
L60-L75Disorders of skin appendages (L60-L75)
L66Cicatricial alopecia [scarring hair loss]Not billable
L66.0PseudopeladeBillable
L66.1Lichen planopilarisSubcodes
L66.2Folliculitis decalvansBillable
L66.3Perifolliculitis capitis abscedensBillable
L66.4Folliculitis ulerythematosa reticulataBillable
L66.8Other cicatricial alopeciaSubcodes
L66.9Cicatricial alopecia, unspecifiedBillable

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

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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