2026 ICD-10-CM Diagnosis Code K13.4Granuloma and granuloma-like lesions of oral mucosa

ICD-10-CM Codes›K00–K95›K00-K14›K13

ICD-10-CM K13.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K13.4 is a billable ICD-10-CM diagnosis code for granuloma and granuloma-like lesions of oral mucosa. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 157 through 159. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Any dental condition including traumatic injury, Diseases of mouth; excluding dental, and Nontraumatic dental conditions.

Code Identity

ICD-10-CM Code
K13.4
Billable Status
Yes — Valid for Submission
Code Describes
Granuloma and granuloma-like lesions of oral mucosa
Short Description
Granuloma and granuloma-like lesions of oral mucosa
Same as the full description in the CMS dataset.
Parent Code
K13
Other diseases of lip and oral mucosa

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK00-K14Diseases of oral cavity and salivary glands
CategoryK13Other diseases of lip and oral mucosa
This CodeK13.4Granuloma and granuloma-like lesions of oral mucosa

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • AFM - acanthoma fissuratum of mucosa
  • Crohn's disease of oral soft tissues
  • Eosinophilic granuloma
  • Eosinophilic granuloma of oral mucosa
  • Hemangioma of oral cavity
  • Orofacial granulomatosis
  • Pyogenic granuloma
  • Pyogenic granuloma of oral mucosa
  • Traumatic ulcerative granuloma of tongue with stromal eosinophilia
  • Ulcer on tongue
  • Verruciform xanthoma of oral mucous membrane

Tabular List NotesGuidance

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

Inclusion Terms

  • Eosinophilic granuloma
  • Granuloma pyogenicum
  • Verrucous xanthoma

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.

    • Granuloma
      • eosinophilic
        • oral mucosa
    • Granuloma
      • oral mucosa
    • Granuloma
      • pyogenic, pyogenicum (of) (skin)
        • oral mucosa
    • Xanthoma(s), xanthomatosis (primary) (familial) (hereditary)
      • verrucous, oral mucosa

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR DEN001
Any dental condition including traumatic injury
Default principal diagnosis: inpatient No · outpatient No
CCSR DIG003
Diseases of mouth; excluding dental
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR DEN002
Nontraumatic dental conditions
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Churg-Strauss Syndrome

    widespread necrotizing angiitis with granulomas. pulmonary involvement is frequent. asthma or other respiratory infection may precede evidence of vasculitis. eosinophilia and lung involvement differentiate this disease from polyarteritis nodosa.

  • Eosinophilic Granuloma

    the most benign and common form of langerhans-cell histiocytosis which involves localized nodular lesions predominantly of the bones but also of the gastric mucosa, small intestine, lungs, or skin, with infiltration by eosinophils.

  • Kimura Disease

    a chronic inflammatory disease characterized by benign enlargement of cervical lymph node and salivary glands with increased levels of immunoglobulin e. unlike angiolymphoid hyperplasia with eosinophilia it involves eosinophil infiltrates in lymph node and salivary glands and mostly found in asian males.

  • Polyarteritis Nodosa

    a form of necrotizing non-granulomatous inflammation occurring primarily in medium-sized arteries, often with microaneurysms. it is characterized by muscle, joint, and abdominal pain resulting from arterial infarction and scarring in affected organs. polyarteritis nodosa with lung involvement is called churg-strauss syndrome.

  • Eosinophils

    granular leukocytes with a nucleus that usually has two lobes connected by a slender thread of chromatin, and cytoplasm containing coarse, round granules that are uniform in size and stainable by eosin.

Patient EducationClinical

Mouth Disorders

Your mouth is one of the most important parts of your body. It has many different functions. It allows you to:

Read the full article at MedlinePlus

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

Convert K13.4 to ICD-9-CMHistory

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

ICD-9-CM
528.9 Oral soft tissue dis 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 K13.4Overview

Is K13.4 (Other diseases of lip and oral mucosa) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report granuloma and granuloma-like lesions of oral mucosa on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K13.4 group to?

When granuloma and granuloma-like lesions of oral mucosa is the principal diagnosis on an inpatient stay, it groups to MS-DRG 157, 158, 159, with relative weights from 0.7085 to 1.7168 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of K13.4?

Under the General Equivalence Mappings, granuloma and granuloma-like lesions of oral mucosa converts to ICD-9-CM 528.9 (oral soft tissue dis 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.