2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

L73.9 is a billable ICD-10-CM diagnosis code for follicular disorder, unspecified. 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
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
  • Chronic folliculitis of lower leg
  • Chronic folliculitis of lower limb
  • 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to L73.9: 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.

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

  • Folliculitis

    inflammation of follicles, primarily hair follicles.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About L73.9Overview

What is the ICD-10 code for follicular disorder, unspecified?

The ICD-10-CM code for follicular disorder, unspecified is L73.9 (sometimes written as L739). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 607, 606, with relative weights from 0.8772 to 1.5721 depending on complications. Higher weights mean higher Medicare reimbursement.

Can L73.9 be reported with a code from Q84?

Not as a rule. The Excludes1 note at block L60-L75, which applies to L73.9, 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).

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.