ICD-10 Code K05.31 – Chronic periodontitis, localized (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K05.31 – Chronic periodontitis, localized
What it is
K05.31 identifies chronic periodontitis limited to a localized area of the mouth. Use it when the record shows ongoing periodontal inflammation and tissue support loss affecting specific teeth or sites, not the entire dentition.
Clinical signs
Typical findings include gingival inflammation, periodontal pocketing, attachment loss, and possible bone loss around selected teeth. Clinical features vary; refer to documentation for the exact sites and extent.
When to use this code
Use this code when the dentist or periodontist documents chronic periodontitis and clearly states it is localized. It fits cases where only part of the mouth is affected, such as a few teeth or one quadrant.
If the note describes generalized disease, acute infection, or another periodontal condition, this code may not apply. Check documentation for site specificity and whether the diagnosis is chronic.
Do not use for
Do not use K05.31 for generalized periodontitis or for gingivitis without periodontal attachment loss. Check documentation if the record is unclear or uses non-specific periodontal terminology.
Coding tip
Confirm that the provider documents both chronic periodontitis and localized involvement before assigning K05.31.