2026 ICD-10-CM Diagnosis Code K05.20Aggressive periodontitis, unspecified
ICD-10-CM Codes›K00–K95›K00-K14›K05
- Billable — Valid for Submission
- Not Chronic
K05.20 is a billable ICD-10-CM diagnosis code for aggressive periodontitis, 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. 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.
- Abscess of oral soft tissue
- Acute gingivitis
- Acute multiple gingival abscesses
- Acute necrotizing ulcerative periodontitis
- Acute pericoronitis
- Acute periodontitis
- Aggressive periodontitis
- Injury of periodontal tissue
- Multiple abscesses
- Necrotizing periodontal disease
- Necrotizing ulcerative periodontitis
- Pericoronitis
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) L02.91
aggressive K05.20
aggressive K05.20
Infection, infected, infective (opportunistic) B99.9
peridental, periodontal K05.20
peridental, periodontal K05.20
Pericementitis (chronic) (suppurative) See Also: Periodontitis;
acute K05.20
Periodontitis (chronic) (complex) (compound) (local) (simplex) K05.30
acute K05.20
aggressive K05.20
Suppuration, suppurative See Also: condition;
gum K05.20
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
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.Pericoronitis
inflammation of the gingiva surrounding the crown of a tooth.Acute Periodontitis
an acute inflammatory process that affects the tissues that surround and support the teeth.
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 K05.20 to ICD-9-CMHistory
Code HistoryHistory
Questions About K05.20Overview
What is the ICD-10 code for aggressive periodontitis, unspecified?
The ICD-10-CM code for aggressive periodontitis, unspecified is K05.20 (sometimes written as K0520). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is K05.20 (Aggressive periodontitis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report aggressive periodontitis, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does K05.20 group to?
When aggressive periodontitis, 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 K05.20?
Under the General Equivalence Mappings, aggressive periodontitis, unspecified converts to ICD-9-CM 523.30 (aggres periodontitis NOS) and 523.33 (acute periodontitis). The mapping is approximate, so confirm the match fits the documentation.
