ICD-10-CM L66.1 is the diagnosis code for Lichen planopilaris. This code falls under the section "Disorders of skin appendages" within Chapter 12 — Diseases of the skin and subcutaneous tissue (L00-L99). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where L66.1 sits in the ICD-10-CM classification helps ensure proper coding:
No, L66.1 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
L66.1 is the ICD-10-CM diagnosis code for "Lichen planopilaris". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of L66.1 is L66 ("Cicatricial alopecia [scarring hair loss]"). L66.1 provides a more specific classification within this category.
L66.1 is located in Section L60-L75 — "Disorders of skin appendages" within Chapter 12 of the ICD-10-CM Tabular List.
L66.1 has 4 sub-code(s) that provide more specific detail: L66.10, L66.11, L66.12, L66.19.
Use L66.1 when the patients documented diagnosis matches "Lichen planopilaris" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Lichen planopilaris is L66.1.
No, L66.1 is non-billable. Use a more specific sub-code for primary diagnosis billing.
L66.1 is in Chapter 12 of the ICD-10-CM Tabular List.
Yes, L66.1 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.