L66: Cicatricial alopecia [scarring hair loss]
Codes under L66 (Cicatricial alopecia [scarring hair loss]). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| L66.0 | Pseudopelade | ✓ |
| L66.0 | Pseudopelade | ✓ |
| L66.1 | Lichen planopilaris | — |
| L66.1 | Lichen planopilaris | — |
| L66.2 | Folliculitis decalvans | ✓ |
| L66.2 | Folliculitis decalvans | ✓ |
| L66.3 | Perifolliculitis capitis abscedens | ✓ |
| L66.3 | Perifolliculitis capitis abscedens | ✓ |
| L66.4 | Folliculitis ulerythematosa reticulata | ✓ |
| L66.4 | Folliculitis ulerythematosa reticulata | ✓ |
| L66.8 | Other cicatricial alopecia | — |
| L66.8 | Other cicatricial alopecia | — |
| L66.9 | Cicatricial alopecia, unspecified | ✓ |
| L66.9 | Cicatricial alopecia, unspecified | ✓ |
| L66.10 | Lichen planopilaris, unspecified | ✓ |
| L66.10 | Lichen planopilaris, unspecified | ✓ |
| L66.11 | Classic lichen planopilaris | ✓ |
| L66.11 | Classic lichen planopilaris | ✓ |
| L66.12 | Frontal fibrosing alopecia | ✓ |
| L66.12 | Frontal fibrosing alopecia | ✓ |
| L66.19 | Other lichen planopilaris | ✓ |
| L66.19 | Other lichen planopilaris | ✓ |
| L66.81 | Central centrifugal cicatricial alopecia | ✓ |
| L66.81 | Central centrifugal cicatricial alopecia | ✓ |
| L66.89 | Other cicatricial alopecia | ✓ |
| L66.89 | Other cicatricial alopecia | ✓ |
Frequently asked questions
What is ICD-10-CM code L66?
L66 is an ICD-10-CM category covering Cicatricial alopecia [scarring hair loss]. It contains 26 more specific diagnosis codes, 22 of which are billable.
Is L66 a billable code?
No — L66 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example L66.0 — Pseudopelade). 22 of the 26 codes under L66 are billable.
What codes fall under L66?
L66 includes L66.0, L66.0, L66.1, L66.1, L66.2, plus 21 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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