2026 ICD-10-CM Diagnosis Code L73.9Follicular disorder, unspecified

ICD-10-CM Codes›L00–L99›L60-L75›L73

ICD-10-CM L73.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L73.9 is a billable ICD-10-CM diagnosis code for follicular disorder, unspecified. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified skin disorders.

Code Identity

ICD-10-CM Code
L73.9
Billable Status
Yes — Valid for Submission
Code Describes
Follicular disorder, unspecified
Short Description
Follicular disorder, unspecified
Same as the full description in the CMS dataset.
Parent Code
L73
Other follicular disorders

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL60-L75Disorders of skin appendages
CategoryL73Other follicular disorders
This CodeL73.9Follicular disorder, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute folliculitis
  • Agminate folliculitis
  • Bacterial folliculitis
  • Chronic folliculitis
  • Disorder of sebaceous gland
  • Eyelash follicle finding
  • Folliculitis
  • Folliculitis of lids
  • Gram-negative folliculitis
  • Hair follicle disorder
  • Malassezia folliculitis
  • Nodular folliculitis
  • Nuchal folliculitis
  • Pseudomonas aeruginosa folliculitis
  • Superficial folliculitis
  • Superficial folliculitis caused by bacterium

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.

    • Disease, diseased
      • hair (color) (shaft)
        • follicles
    • Disease, diseased
      • sebaceous glands
    • Disorder(of)
      • follicular (skin)
    • Folliculitis(superficial)

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

  • Acne Keloid

    a type of acneiform disorder in which secondary pyogenic infection in and around pilosebaceous structures ends in keloidal scarring. it manifests as persistent folliculitis of the back of the neck associated with occlusion of the follicular orifices. it is most often encountered in black or asian men.

  • Folliculitis

    inflammation of follicles, primarily hair follicles.

  • Tinea Versicolor

    a common chronic, noninflammatory and usually symptomless disorder, characterized by the occurrence of multiple macular patches of all sizes and shapes, and varying in pigmentation from fawn-colored to brown. it is seen most frequently in hot, humid, tropical regions and is mostly caused by malassezia furfur (formerly pityrosporum orbiculare).

Patient EducationClinical

Skin Conditions

Your skin is your body's largest organ. It covers the entire outside of your body. There are many ways that your skin protects your body and helps keep you healthy. For example, it:

The full article covers:

  • What does your skin do?
  • What problems and conditions can affect your skin?
  • How can I keep my skin healthy?

Read the full article at MedlinePlus

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

Convert L73.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
704.9 Hair disease NOS
Approximate The match is approximate rather than exact.
ICD-9-CM
706.9 Sebaceous gland dis NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About L73.9Overview

Is L73.9 (Other follicular disorders) a billable code?

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

What MS-DRG does L73.9 group to?

When follicular disorder, unspecified 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.

What is the ICD-9 equivalent of L73.9?

Under the General Equivalence Mappings, follicular disorder, unspecified converts to ICD-9-CM 704.9 (hair disease NOS) and 706.9 (sebaceous gland dis NOS). The mapping is approximate, so confirm the match fits the documentation.

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.