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L66

Non-billable

Cicatricial alopecia [scarring hair loss]

L66 is the ICD-10-CM code for Cicatricial alopecia [scarring hair loss]. It is a non-billable category code — use a more specific child code such as L66.0 for billing.

Status
Header (non-billable)
Chapter
L00-L99
Subcodes
7
Edition
FY2026

L00-L99 Diseases of the skin and subcutaneous tissue

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code L66?
L66 is the ICD-10-CM code for "Cicatricial alopecia [scarring hair loss]". It falls under L00-L99 Diseases of the skin and subcutaneous tissue.
Is L66 a billable code?
No — L66 is a non-billable header code. Use a more specific child code (such as L66.0) for billing.
What are the subcodes of L66?
L66 has 7 more specific child codes, including L66.0, L66.1, L66.2.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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