2026 ICD-10-CM Diagnosis Code K05.6Periodontal disease, unspecified

ICD-10-CM Codes›K00–K95›K00-K14›K05

ICD-10-CM K05.6
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K05.6 is a billable ICD-10-CM diagnosis code for periodontal disease, unspecified. 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 dental peri-implantitis. 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
K05.6
Billable Status
Yes — Valid for Submission
Code Describes
Periodontal disease, unspecified
Short Description
Periodontal disease, unspecified
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 CodeK05.6Periodontal disease, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Dental peri-implantitis
  • Dental peri-implantitis due to dental biofilm
  • Fetal disorder due to maternal periodontal disease
  • Maxillary sinusitis due to dental disorder
  • Maxillary sinusitis due to periodontal disease
  • Periodontal disease

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

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 K05.6 to ICD-9-CMHistory

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

ICD-9-CM
523.9 Gingiv/periodont dis NOS
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 K05.6Overview

What is the ICD-10 code for periodontal disease, unspecified?

The ICD-10-CM code for periodontal disease, unspecified is K05.6 (sometimes written as K056). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is K05.6 (Gingivitis and periodontal diseases) a billable code?

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

What MS-DRG does K05.6 group to?

When periodontal disease, unspecified 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 K05.6?

Under the General Equivalence Mappings, periodontal disease, unspecified converts to ICD-9-CM 523.9 (gingiv/periodont dis NOS). The mapping is approximate, so confirm the match fits the documentation.