L66 ICD-10-CM Code: Cicatricial alopecia [scarring hair loss]
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
L66Cicatricial alopecia [scarring hair loss]
ICD-10-CM diagnosis code · United States clinical modification
Where L66 sits
- 1
Chapter 12
Diseases of the skin and subcutaneous tissue (L00-L99)
- 2
Section
Disorders of skin appendages (L60-L75)
- 3
Category L66
Cicatricial alopecia [scarring hair loss]
- 4
Code L66
Cicatricial alopecia [scarring hair loss]
Codes under L66
L66 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Notes for this code
Inclusion terms
No inclusion terms are listed for L66.
Code first
No “code first” instruction is listed for L66.
Use additional code
No “use additional code” instruction is listed for L66.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for L66.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for L66.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code L66 mean?
L66 is the FY 2027 U.S. ICD-10-CM code for “Cicatricial alopecia [scarring hair loss].”
Is L66 a billable or specific ICD-10-CM code?
No. L66 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is L66 located in ICD-10-CM?
L66 is listed in Chapter 12, Diseases of the skin and subcutaneous tissue (L00-L99), within Disorders of skin appendages (L60-L75) (L60–L75), under category L66, Cicatricial alopecia [scarring hair loss].
What coding notes are listed for L66?
No inclusion terms are listed for L66 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.