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

L98.5 is a billable ICD-10-CM diagnosis code for mucinosis of the skin. 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
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to L98.5: its own notes plus those printed at 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.

  • Focal mucinosis
  • Lichen myxedematosus
  • Reticular erythematous mucinosis

Excludes1

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

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

  • Mucinoses

    mucoid states characterized by the elevated deposition and accumulation of mucin (mucopolysaccharides) in dermal tissue. the fibroblasts are responsible for the production of acid mucopolysaccharides (glycosaminoglycans) in the ground substance of the connective tissue system. when fibroblasts produce abnormally large quantities of mucopolysaccharides as hyaluronic acid, chondroitin sulfate, or heparin, they accumulate in large amounts in the dermis.

  • 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.

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

Questions About L98.5Overview

What is the ICD-10 code for mucinosis of the skin?

The ICD-10-CM code for mucinosis of the skin is L98.5 (sometimes written as L985). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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

Can L98.5 be reported with K13.79?

Not as a rule. The Excludes1 note on L98.5 lists "focal oral mucinosis (K13.79)". 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 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.