2026 ICD-10-CM Diagnosis Code L98.5Mucinosis of the skin

ICD-10-CM Codes›L00–L99›L80-L99›L98

ICD-10-CM L98.5
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L98.5 is a billable ICD-10-CM diagnosis code for mucinosis of the skin. 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
L98.5
Billable Status
Yes — Valid for Submission
Code Describes
Mucinosis of the skin
Short Description
Mucinosis of the skin
Same as the full description in the CMS dataset.
Parent Code
L98
Other disorders of skin and subcutaneous tissue, not elsewhere classified

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL80-L99Other disorders of the skin and subcutaneous tissue
CategoryL98Other disorders of skin and subcutaneous tissue, not elsewhere classified
This CodeL98.5Mucinosis of the skin

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acral persistent papular mucinosis
  • Atypical lichen myxedematosus
  • Diffuse cutaneous mucinosis
  • Discrete papular lichen myxedematosus
  • Focal cutaneous mucinosis
  • Focal primary mucinosis of skin
  • Follicular mucinosis type mycosis fungoides
  • Lichen myxedematosus
  • Localized lichen myxedematosus
  • Lupus erythematosus-associated papulonodular mucinosis
  • Mucinosis affecting skin
  • Nodular lichen myxedematosus
  • Papular mucinosis of infancy
  • Reticular erythematous mucinosis
  • Scleromyxedema
  • Secondary catabolic mucinosis of skin
  • Self-healing juvenile cutaneous mucinosis

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Focal mucinosis
  • Lichen myxedematosus
  • Reticular erythematous mucinosis

Type 1 Excludes

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.

    • Lichen
      • myxedematosus
    • Mucinosis(cutaneous) (focal) (papular) (reticular erythematous) (skin)
    • Myxedema(adult) (idiocy) (infantile) (juvenile)
      • cutis
    • Myxedema(adult) (idiocy) (infantile) (juvenile)
      • papular
    • Reticular erythematous mucinosis
    • Scleromyxedema

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

  • Scleromyxedema

    a connective tissue disorder characterized by widespread thickening of skin with a cobblestone-like appearance. it is caused by proliferation of fibroblasts and deposition of mucin in the dermis in the absence of thyroid disease. most scleromyxedema cases are associated with a monoclonal gammopathy, immunoglobulin igg-lambda.

  • Scleromyxedema

    a rare chronic and progressive skin disorder characterized by mucin deposition in the skin, resulting in the thickening and hardening of the skin, predominantly in the face, fingers, and extremities.

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 L98.5 to ICD-9-CMHistory

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

ICD-9-CM
701.8 Skin hypertro/atroph NEC
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 L98.5Overview

Is L98.5 a billable code?

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

What MS-DRG does L98.5 group to?

When mucinosis of the skin 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 L98.5?

Under the General Equivalence Mappings, mucinosis of the skin converts to ICD-9-CM 701.8 (skin hypertro/atroph NEC). 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.