2026 ICD-10-CM Diagnosis Code K05.4Periodontosis

ICD-10-CM Codes›K00–K95›K00-K14›K05

ICD-10-CM K05.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K05.4 is a billable ICD-10-CM diagnosis code for periodontosis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 11 through 13, 157 through 159. Coders also document this condition as alveolar bone loss. 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
K05.4
Billable Status
Yes — Valid for Submission
Code Describes
Periodontosis
Short Description
Periodontosis
Same as the full description in the CMS dataset.
Parent Code
K05
Gingivitis and periodontal diseases

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK00-K14Diseases of oral cavity and salivary glands
CategoryK05Gingivitis and periodontal diseases
This CodeK05.4Periodontosis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Alveolar bone loss
  • Papillon-Lefèvre syndrome

Tabular List NotesGuidance

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

Inclusion Terms

  • Juvenile periodontosis

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 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

Clinical InformationClinical

  • Alveolar Bone Loss

    resorption or wasting of the tooth-supporting bone (alveolar process) in the maxilla or mandible.

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 K05.4 to ICD-9-CMHistory

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

ICD-9-CM
523.5 Periodontosis
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 K05.4Overview

What is the ICD-10 code for periodontosis?

The ICD-10-CM code for periodontosis is K05.4 (sometimes written as K054). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is K05.4 (Gingivitis and periodontal diseases) a billable code?

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

What MS-DRG does K05.4 group to?

When periodontosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 11, 12, 13, 157, 158, 159, with relative weights from 0.7085 to 5.4541 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of K05.4?

Under the General Equivalence Mappings, periodontosis converts to ICD-9-CM 523.5 (periodontosis). The mapping is a direct match.