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L43.9 — Lichen planus, unspecified
L43.9
What this code means
Lichen planus is an itchy, purple, flat-topped spotty rash affecting skin, mouth or nails; cause not specified here.
Also called: lichen planus.
When this code is used
Used for lichen planus, unspecified.
Where it sits in ICD-10-CM
Code L43.9 belongs to Chapter 12: Diseases of the skin and subcutaneous tissue, which covers codes L00–L99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Related symptoms
Related anatomy
Frequently asked questions
What is ICD-10-CM code L43.9?
L43.9 is the ICD-10-CM diagnosis code for “Lichen planus, unspecified”. Lichen planus is an itchy, purple, flat-topped spotty rash affecting skin, mouth or nails; cause not specified here.
When is code L43.9 used?
Used for lichen planus, unspecified. It belongs to Chapter 12 of ICD-10-CM (Diseases of the skin and subcutaneous tissue).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.