ICD-10-CM 2027
ICD-10 code for planopilaris lichen
From the official ICD-10-CM alphabetic index entry “Lichen › planopilaris”. Page updated September 29, 2026.
About coding planopilaris lichen
The ICD-10-CM code for planopilaris lichen is L66.10 (Lichen planopilaris, unspecified). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on L66.10.
Within L66.1, choose L66.10 (unspecified) only when documentation doesn't support a more specific option: Classic lichen planopilaris (L66.11), frontal fibrosing alopecia (L66.12) 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.
More specific planopilaris lichen codes (official index)
Common questions about planopilaris lichen ICD-10 codes
What is the ICD-10 code for planopilaris lichen?
- L66.10 — Lichen planopilaris, unspecified. More specific codes apply when the documentation supports them: L66.11, L66.11, L66.19.
What is the ICD-10 code for classic planopilaris lichen?
- L66.11 — Classic lichen planopilaris.
What is the ICD-10 code for follicular planopilaris lichen?
- L66.11 — Classic lichen planopilaris.
Is L66.10 billable?
- Yes. L66.10 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can L66.10 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict L66.10 as a principal diagnosis.
Is L66.10 a CC or MCC?
- No. L66.10 is neither a CC nor an MCC under MS-DRG v44.0.