2026 ICD-10-CM Diagnosis Code K05.5Other periodontal diseases
ICD-10-CM Codes›K00–K95›K00-K14›K05
- Billable — Valid for Submission
- Not Chronic
K05.5 is a billable ICD-10-CM diagnosis code for other periodontal diseases. 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; 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
- Developmental anomaly of periodontal tissue
- Gingival pocket
- Injury of periodontal tissue
- Intrabony periodontal defect
- Necrotizing periodontal disease
- Necrotizing ulcerative periodontitis
- Periodontal and endodontic lesion
- Periodontal ligament strain
- Periodontal pocket
- Primary endodontic lesion with secondary periodontal lesion
- Primary periodontal lesion with secondary endodontic lesion
- Thickened dental follicle
- True combined periodontal and endodontic lesion
- Vertical alveolar bone loss
- Widened periodontal ligament space
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Combined periodontic-endodontic lesion
- Narrow gingival width (of periodontal soft tissue)
Type 2 Excludes
- leukoplakia of gingiva K13.21
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.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Disease, diseased - See Also: Syndrome;
- periodontal - K05.6
- specified NEC - K05.5
- combined periodontic - endodontic - K05.5
- periodontal, due to traumatic occlusion - K05.5
- Narrow
- periodontal - K05.5
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Disease, diseased
- periodontal
- specified NEC
- Lesion(s) (nontraumatic)
- combined periodontic - endodontic
- Lesion(s) (nontraumatic)
- periodontal, due to traumatic occlusion
- Narrow
- gingival width (of periodontal soft tissue)
- Occlusion, occluded
- traumatic
- periodontal
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Periodontal Diseases
pathological processes involving the periodontium including the gum (gingiva), the alveolar bone (alveolar process), the dental cementum, and the periodontal ligament.Gingival Pocket
an abnormal extension of a gingival sulcus not accompanied by the apical migration of the epithelial attachment.Periodontal Debridement
removal or disruption of dental deposits and plaque-retentive dental calculus from tooth surfaces and within the periodontal pocket space without deliberate removal of cementum as done in root planing and often in dental scaling. the goal is to conserve dental cementum to help maintain or re-establish healthy periodontal environment and eliminate periodontitis by using light instrumentation strokes and nonsurgical techniques (e.g., ultrasonic, laser instruments).Periodontal Pocket
an abnormal extension of a gingival sulcus accompanied by the apical migration of the epithelial attachment and bone resorption.Alveolar Bone Loss
resorption or wasting of the tooth-supporting bone (alveolar process) in the maxilla or mandible.Gingival Pocket
an abnormal deepening of a gingival sulcus not associated with destruction of the supporting periodontal tissue.
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 K05.5 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About K05.5Overview
Is K05.5 (Gingivitis and periodontal diseases) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other periodontal diseases on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does K05.5 group to?
When other periodontal diseases 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 K05.5?
Under the General Equivalence Mappings, other periodontal diseases converts to ICD-9-CM 523.8 (periodontal disease 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.
