2026 ICD-10-CM Diagnosis Code L66.89Other cicatricial alopecia

ICD-10-CM Codes›L00–L99›L60-L75›L66

ICD-10-CM L66.89
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L66.89 is a billable ICD-10-CM diagnosis code for other cicatricial alopecia. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 606 through 607. Coders also document this condition as lepromatous scarring alopecia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified skin disorders.

Code Identity

ICD-10-CM Code
L66.89
Billable Status
Yes — Valid for Submission
Code Describes
Other cicatricial alopecia
Short Description
Other 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 CodeL66.89Other cicatricial alopecia

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Lepromatous scarring alopecia
  • Lipedema
  • Lipedematous alopecia
  • Scarring alopecia due to infectious disease

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Alopecia(hereditaria) (seborrheica)
      • cicatricial
        • specified NEC

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

  • Lipedema

    disorder of adipose tissue characterized by symmetric and bilateral enlargement of the lower extremities due to abnormal deposition of subcutaneous fat often in obese women. it is associated with hematoma, pain and may progress to secondary lymphedema which is known as lipolymphedema.

Code History & ChangesHistory

Replacement L66.89 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 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About L66.89Overview

Is L66.89 (Other cicatricial alopecia) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other cicatricial alopecia on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does L66.89 group to?

When other cicatricial alopecia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 606, 607, with relative weights from 0.9064 to 1.5132 depending on complications. Higher weights mean higher Medicare reimbursement.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.