2026 ICD-10-CM Diagnosis Code K05.4Periodontosis
ICD-10-CM Codes›K00–K95›K00-K14›K05
- Billable — Valid for Submission
- Not Chronic
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 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
Code Classification
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
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Paradentosis - K05.4
- Parodontosis - K05.4
- Periclasia - K05.4
- Periodontoclasia - K05.4
- Periodontosis (juvenile) - K05.4
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Paradentosis
- Parodontosis
- Periclasia
- Periodontoclasia
- Periodontosis(juvenile)
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
Code HistoryHistory
Questions About K05.4Overview
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 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 K05.4?
Under the General Equivalence Mappings, periodontosis converts to ICD-9-CM 523.5 (periodontosis). 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.
