L43.9
✓ BillableLichen planus, unspecified
Diseases of the skin and subcutaneous tissue (L00-L99)
❌ Excludes1
inheritedRules inherited from parent codes in the hierarchy.
- • lichen planopilaris (L66.1-)
Clinical Description
ICD-10-CM code L43.9 represents lichen planus, unspecified. This code falls under the Diseases of the skin and subcutaneous tissue (L00-L99) classification. It is a billable/specific code valid for HIPAA-covered transactions as of October 1, 2025 (FY2026). This code can be used to indicate a diagnosis for reimbursement purposes on insurance claims.
This is a 5-character code at the 4th level of specificity. This is the most specific code available in this subcategory. Coders should note that L43.9 has 1 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.
Frequently Asked Questions
What is ICD-10 code L43.9?
ICD-10-CM code L43.9 is "Lichen planus, unspecified". It belongs to the category: Diseases of the skin and subcutaneous tissue (L00-L99).
Is L43.9 a billable ICD-10 code?
Yes, L43.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
What codes are excluded with L43.9?
L43.9 has 1 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.
Related Codes in L43
Other codes in the same category that may be relevant for differential coding:
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Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)