2027 ICD-10-CM Diagnosis Code L66.81Central centrifugal cicatricial alopecia

ICD-10-CM Codes›L00–L99›L60-L75›L66

ICD-10-CM L66.81
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

L66.81 is a billable ICD-10-CM diagnosis code for central centrifugal cicatricial alopecia. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 606 through 607. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified skin disorders.

Code Identity

ICD-10-CM Code
L66.81
Billable Status
Yes — Valid for Submission
Code Describes
Central centrifugal cicatricial alopecia
Short Description
Central centrifugal cicatricial alopecia
Same as the full description in the CMS dataset.
Parent Code
L66.8
Other cicatricial alopecia

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL60-L75Disorders of skin appendages
CategoryL66Cicatricial alopecia [scarring hair loss]
This CodeL66.81Central centrifugal cicatricial alopecia

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Central centrifugal cicatricial alopecia

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to L66.81: its own notes plus those printed at block L60-L75 and Chapter 12. A note printed at a category, block or chapter applies to every code under it.

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • CCCA

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Block L60-L75 Disorders of skin appendages applies to 85 codes
  • congenital malformations of integument (Q84.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 12 (L00-L99) Diseases of the skin and subcutaneous tissue applies to 1,001 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • lipomelanotic reticulosis (I89.8)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • viral warts (B07.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR SKN007
Other specified and unspecified skin disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Central Centrifugal Cicatricial Alopecia

    an inflammatory, scarring form of alopecia characterized by permanent, patchy hair loss that initially presents on the vertex of the scalp and spreads outward.

Patient EducationClinical

Hair Loss

You lose up to 100 hairs from your scalp every day. That's normal, and in most people, those hairs grow back. But many men -- and some women -- lose hair as they grow older. You can also lose your hair if you have certain diseases, such as thyroid problems, diabetes, or lupus.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code History & ChangesHistory

Replacement L66.81 replaces the following previously assigned code(s):

  • L66.8 - Other cicatricial alopecia
FY 2025AddedAdded to the ICD-10-CM code setEffective October 1, 2024.
FY 2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About L66.81Overview

What is the ICD-10 code for central centrifugal cicatricial alopecia?

The ICD-10-CM code for central centrifugal cicatricial alopecia is L66.81 (sometimes written as L6681). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is L66.81 (Other cicatricial alopecia) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report central centrifugal cicatricial alopecia on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does L66.81 group to?

When central centrifugal cicatricial alopecia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 607, 606, with relative weights from 0.8772 to 1.5721 depending on complications. Higher weights mean higher Medicare reimbursement.

Can L66.81 be reported with a code from Q84?

Not as a rule. The Excludes1 note at block L60-L75, which applies to L66.81, lists "congenital malformations of integument (Q84.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).