2026 ICD-10-CM Diagnosis Code K05.00Acute gingivitis, plaque induced

ICD-10-CM Codes›K00–K95›K00-K14›K05

ICD-10-CM K05.00
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K05.00 is a billable ICD-10-CM diagnosis code for acute gingivitis, plaque induced. 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. Coders also document this condition as acute gingivitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Any dental condition including traumatic injury; Caries, periodontitis, and other preventable dental conditions; and Disorders of teeth and gingiva.

Code Identity

ICD-10-CM Code
K05.00
Billable Status
Yes — Valid for Submission
Code Describes
Acute gingivitis, plaque induced
Short Description
Acute gingivitis, plaque induced
Same as the full description in the CMS dataset.
Parent Code
K05.0
Acute gingivitis

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK00-K14Diseases of oral cavity and salivary glands
CategoryK05Gingivitis and periodontal diseases
This CodeK05.00Acute gingivitis, plaque induced

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute gingivitis
  • Acute ulcerative gingivitis
  • Catarrhal gingivitis
  • Ulceration of gingivae
  • Ulcerative gingivitis

Tabular List NotesGuidance

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

Inclusion Terms

  • Acute gingivitis NOS
  • Plaque induced gingival disease

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.

    • Catarrh, catarrhal(acute) (febrile) (infectious) (inflammation)
      • gingivitis
    • Catarrh, catarrhal(acute) (febrile) (infectious) (inflammation)
      • gingivitis
        • plaque induced
    • Disease, diseased
      • gingiva
        • plaque induced
    • Disease, diseased
      • Jourdain's (acute gingivitis)
    • Disease, diseased
      • Jourdain's (acute gingivitis)
        • plaque induced
    • Gingivitis
      • acute (catarrhal)
    • Gingivitis
      • acute (catarrhal)
        • plaque induced
    • Infection, infected, infective(opportunistic)
      • gingiva (chronic)
        • acute
    • Infection, infected, infective(opportunistic)
      • gingiva (chronic)
        • acute
          • plaque induced
    • Infection, infected, infective(opportunistic)
      • gum (chronic)
        • acute
    • Infection, infected, infective(opportunistic)
      • gum (chronic)
        • acute
          • plaque induced

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 DEN003
Caries, periodontitis, and other preventable dental conditions
Default principal diagnosis: inpatient No · outpatient No
CCSR DIG002
Disorders of teeth and gingiva
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR DEN002
Nontraumatic dental conditions
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Gum Disease

If you have gum disease, you're not alone. Many U.S. adults currently have some form of the disease. It ranges from simple gum inflammation, called gingivitis, to serious damage to the tissue and bone supporting the teeth. In the worst cases, you can lose teeth.

Read the full article at MedlinePlus

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

Convert K05.00 to ICD-9-CMHistory

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

ICD-9-CM
523.00 Acute gingititis, plaque
Exact Match The mapping is direct, with no qualifiers.

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 K05.00Overview

Is K05.00 (Acute gingivitis) a billable code?

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

What MS-DRG does K05.00 group to?

When acute gingivitis, plaque induced 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 K05.00?

Under the General Equivalence Mappings, acute gingivitis, plaque induced converts to ICD-9-CM 523.00 (acute gingititis, plaque). The mapping is a direct match.

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.