ICD-10 Code K05.20 – Aggressive Periodontitis, Unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K05.20 – Aggressive periodontitis, unspecified
What it is
K05.20 identifies aggressive periodontitis when the record does not specify the subtype. It refers to a rapidly progressing periodontal disease that affects the supporting tissues of the teeth.
Clinical signs
Typical findings include rapid attachment loss, bone destruction, and periodontal pocketing. Clinical features vary; refer to documentation for the exact presentation and any localized or generalized pattern.
When to use this code
Use this code when the provider documents aggressive periodontitis but does not name a more specific form. It is also appropriate when the chart confirms periodontal destruction consistent with this diagnosis and no further detail is available.
Code from the provider’s stated diagnosis, not from assumptions based on age or severity alone. If the note identifies a more specific aggressive periodontitis type, use that code instead.
Do not use for
Do not use K05.20 for gingivitis, chronic periodontitis, or periodontal disease without documentation of an aggressive pattern. Check documentation if the diagnosis is only suspected.
Coding tip
If the record says “aggressive periodontitis” without further detail, K05.20 is the correct unspecified code.