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Compare/L43 vs L66.1

L43 vs L66.1

L43 (Lichen planus) compared with L66.1 (Lichen planopilaris), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.

Can these codes be reported together?

No — do not report together. L43 carries an Excludes1 note covering L66.1: “lichen planopilaris (L66.1-)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Side by side

L43Lichen planusL66.1Lichen planopilaris
Billing statusNon-billable header

Report instead: L43.0, L43.1, L43.2, L43.3, L43.8

Non-billable header

Report instead: L66.10, L66.11, L66.12, L66.19

ClassificationL00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99)L00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99)
DefinitionLichen planus is a non-billable ICD-10-CM category code (L43).Lichen planopilaris is a non-billable ICD-10-CM category code (L66.1).
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources