L66Header code — not billable
Cicatricial alopecia [scarring hair loss]
- Chapter
- 12. Diseases of the skin and subcutaneous tissue
- Category
- L66
- Effective date
- October 1, 2026
Related codes in category L66
L66.0PseudopeladeYesL66.1Lichen planopilarisL66.10Lichen planopilaris, unspecifiedYesL66.11Classic lichen planopilarisYesL66.12Frontal fibrosing alopeciaYesL66.19Other lichen planopilarisYesL66.2Folliculitis decalvansYesL66.3Perifolliculitis capitis abscedensYesL66.4Folliculitis ulerythematosa reticulataYesL66.8Other cicatricial alopeciaL66.81Central centrifugal cicatricial alopeciaYesL66.89Other cicatricial alopeciaYes
Frequently asked questions
What is ICD-10 code L66?
L66 is an ICD-10-CM diagnosis code for Cicatricial alopecia [scarring hair loss].
Is L66 a billable code?
No. L66 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is L66 in?
L66 falls under Chapter 12: Diseases of the skin and subcutaneous tissue.
When did L66 become effective?
L66 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to L66?
L66 belongs to category L66, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.