ICD-10-CM 2027
ICD-10 code for frontal fibrosing alopecia
From the official ICD-10-CM alphabetic index entry “Alopecia (hereditaria) (seborrheica) › frontal fibrosing”. Page updated September 29, 2026.
About coding frontal fibrosing alopecia
The ICD-10-CM code for frontal fibrosing alopecia is L66.12 (Frontal fibrosing alopecia).
Within L66.1 (lichen planopilaris), L66.12 is specifically for frontal fibrosing alopecia. Related codes cover unspecified (L66.10), Classic lichen planopilaris (L66.11) and other lichen planopilaris (L66.19).
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.
Common questions about frontal fibrosing alopecia ICD-10 codes
What is the ICD-10 code for frontal fibrosing alopecia?
- L66.12 — Frontal fibrosing alopecia.
Is L66.12 billable?
- Yes. L66.12 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can L66.12 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict L66.12 as a principal diagnosis.
Is L66.12 a CC or MCC?
- No. L66.12 is neither a CC nor an MCC under MS-DRG v44.0.