ICD-10-CM 2027
ICD-10 code for cicatricial alopecia
From the official ICD-10-CM alphabetic index entry “Alopecia (hereditaria) (seborrheica) › cicatricial”. Page updated September 29, 2026.
About coding cicatricial alopecia
The ICD-10-CM code for cicatricial alopecia is L66.9 (Cicatricial alopecia, unspecified). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on L66.9.
Within L66, choose L66.9 (Cicatricial alopecia, unspecified) only when documentation doesn't support a more specific option: Pseudopelade (L66.0), lichen planopilaris (L66.1), Folliculitis decalvans (L66.2), Perifolliculitis capitis abscedens (L66.3), Folliculitis ulerythematosa reticulata (L66.4) and other cicatricial alopecia (L66.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 606 (Minor Skin Disorders with MCC, relative weight 1.5728) and DRG 607 (Minor Skin Disorders without MCC, relative weight 0.8772), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific cicatricial alopecia codes (official index)
Common questions about cicatricial alopecia ICD-10 codes
What is the ICD-10 code for cicatricial alopecia?
- L66.9 — Cicatricial alopecia, unspecified. More specific codes apply when the documentation supports them: L66.81, L66.89.
What is the ICD-10 code for central centrifugal cicatricial alopecia?
- L66.81 — Central centrifugal cicatricial alopecia.
Is L66.9 billable?
- Yes. L66.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can L66.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict L66.9 as a principal diagnosis.
Is L66.9 a CC or MCC?
- No. L66.9 is neither a CC nor an MCC under MS-DRG v44.0.