Gingivitis and periodontal diseases (K05) ICD-10-CM
The K05 code range covers gingivitis and periodontal diseases with 34 ICD-10-CM diagnosis codes. 25 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
Codes in the K05 Range 34 codes · 25 billable
- K05 Gingivitis and periodontal diseasesNon-billable
- K05.0 Acute gingivitisNon-billable
- K05.00 Acute gingivitis, plaque induced
- K05.01 Acute gingivitis, non-plaque induced
- K05.1 Chronic gingivitisNon-billable
- K05.10 Chronic gingivitis, plaque induced
- K05.11 Chronic gingivitis, non-plaque induced
- K05.2 Aggressive periodontitisNon-billable
- K05.20 Aggressive periodontitis, unspecified
- K05.21 Aggressive periodontitis, localizedNon-billable
- K05.211 Aggressive periodontitis, localized, slight
- K05.212 Aggressive periodontitis, localized, moderate
- K05.213 Aggressive periodontitis, localized, severe
- K05.219 Aggressive periodontitis, localized, unspecified severity
- K05.22 Aggressive periodontitis, generalizedNon-billable
- K05.221 Aggressive periodontitis, generalized, slight
- K05.222 Aggressive periodontitis, generalized, moderate
- K05.223 Aggressive periodontitis, generalized, severe
- K05.229 Aggressive periodontitis, generalized, unspecified severity
- K05.3 Chronic periodontitisNon-billable
- K05.30 Chronic periodontitis, unspecified
- K05.31 Chronic periodontitis, localizedNon-billable
- K05.311 Chronic periodontitis, localized, slight
- K05.312 Chronic periodontitis, localized, moderate
- K05.313 Chronic periodontitis, localized, severe
- K05.319 Chronic periodontitis, localized, unspecified severity
- K05.32 Chronic periodontitis, generalizedNon-billable
- K05.321 Chronic periodontitis, generalized, slight
- K05.322 Chronic periodontitis, generalized, moderate
- K05.323 Chronic periodontitis, generalized, severe
- K05.329 Chronic periodontitis, generalized, unspecified severity
- K05.4 Periodontosis
- K05.5 Other periodontal diseases
- K05.6 Periodontal disease, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the K05 range.
Aggressive Periodontitis
Inflammation and loss of PERIODONTIUM that is characterized by rapid attachment loss and bone destruction in the presence of little local factors such as DENTAL PLAQUE and DENTAL CALCULUS. This highly destructive form of periodontitis often occurs in young people and was called early-onset periodontitis, but this disease also appears in old people.
Alveolar Bone Loss
Resorption or wasting of the tooth-supporting bone (ALVEOLAR PROCESS) in the MAXILLA or MANDIBLE.
Chronic Periodontitis
Chronic inflammation and loss of PERIODONTIUM that is associated with the amount of DENTAL PLAQUE or DENTAL CALCULUS present. Chronic periodontitis occurs mostly in adults and was called adult periodontitis, but this disease can appear in young people.
Gingiva
Oral tissue surrounding and attached to TEETH.
Gingival Pocket
An abnormal extension of a gingival sulcus not accompanied by the apical migration of the epithelial attachment.
Gingivitis
Inflammation of gum tissue (GINGIVA) without loss of connective tissue.
Gingivitis, Necrotizing Ulcerative
An acute or chronic GINGIVITIS characterized by redness and swelling, NECROSIS extending from the interdental papillae along the gingival margins, PAIN; HEMORRHAGE, necrotic odor, and often a pseudomembrane. The condition may extend to the ORAL MUCOSA; TONGUE; PALATE; or PHARYNX. The etiology is somewhat unclear, but may involve a complex of FUSOBACTERIUM NUCLEATUM along with spirochetes BORRELIA or TREPONEMA.
Periapical Abscess
Acute or chronic inflammation of tissues surrounding the apical portion of a tooth, associated with the collection of pus, resulting from infection following pulp infection through a carious lesion or as a result of an injury causing pulp necrosis. (Dorland, 27th ed)
Periapical Granuloma
Chronic nonsuppurative inflammation of periapical tissue resulting from irritation following pulp disease or endodontic treatment.
Periapical Periodontitis
Inflammation of the PERIAPICAL TISSUE. It includes general, unspecified, or acute nonsuppurative inflammation. Chronic nonsuppurative inflammation is PERIAPICAL GRANULOMA. Suppurative inflammation is PERIAPICAL ABSCESS.
Pericoronitis
Inflammation of the gingiva surrounding the crown of a tooth.
Periodontal Abscess
Localized circumscribed purulent area of inflammation in the periodontal tissue. It is a derivative of marginal periodontitis and commonly associated with suprabony and infrabony pockets and interradicular involvements, in contrast to periapical abscess which is attributable to pulp necrosis.
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 Diseases
Pathological processes involving the PERIODONTIUM including the gum (GINGIVA), the alveolar bone (ALVEOLAR PROCESS), the DENTAL CEMENTUM, and the PERIODONTAL LIGAMENT.
Periodontal Pocket
An abnormal extension of a gingival sulcus accompanied by the apical migration of the epithelial attachment and bone resorption.
Periodontitis
Inflammation and loss of connective tissues supporting or surrounding the teeth. This may involve any part of the PERIODONTIUM. Periodontitis is currently classified by disease progression (CHRONIC PERIODONTITIS; AGGRESSIVE PERIODONTITIS) instead of age of onset. (From 1999 International Workshop for a Classification of Periodontal Diseases and Conditions, American Academy of Periodontology)
About the K05 Code Range
The ICD-10 code K05 section covers a range of conditions related to gingivitis and periodontal diseases, including both inflammation of the gums and more advanced infections affecting the supporting structures of teeth. These codes help classify specific types of gum diseases, such as acute and chronic gingivitis, aggressive and chronic periodontitis, and other related periodontal conditions.
This section includes well-known terms like acute gingivitis—sometimes called ulcerative gingivitis or catarrhal gingivitis (coded as K05.00 for plaque-induced forms)—and its non-plaque-induced variants (K05.01). Chronic forms (K05.1) are further detailed by whether they are plaque-induced or not. The category also covers aggressive periodontitis (K05.2), which might be classified by severity or location, and chronic periodontitis (K05.3), the more common gum disease associated with gradual bone loss and tooth-support destruction. Other classifications include periodontosis (K05.4), a condition linked to alveolar bone loss, and various other periodontal conditions (K05.5), such as necrotizing diseases and periodontal pockets. When the specific disease type is unclear, K05.6 covers unspecified periodontal disease forms.
Questions About This Page
How many billable codes are in the K05 range?
Of the 34 codes in this range, 25 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the K05 range classify?
The range classifies gingivitis and periodontal diseases. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
