ICD-10 Code K05.313 – Chronic periodontitis, localized, severe (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K05.313 – Chronic periodontitis, localized, severe
What it is
This code identifies a chronic inflammatory periodontal disease affecting limited areas of the mouth, with severe destruction of supporting tissues. It indicates advanced periodontitis that is localized rather than generalized.
Clinical signs
Typical findings include deep periodontal pockets, clinical attachment loss, gingival inflammation, and alveolar bone loss in localized sites. Clinical features vary; refer to documentation.
When to use this code
Use K05.313 when the record clearly documents chronic periodontitis that is both localized and severe. You may also use it when the dentist or periodontist specifies severe attachment loss or bone loss in only some teeth or areas.
Do not infer severity or extent from general gum disease notes alone. Check documentation if the chart does not clearly distinguish localized disease from generalized disease.
Do not use for
Do not use this code for gingivitis, acute periodontal conditions, or unspecified periodontitis. Also avoid it when the record describes generalized disease or does not confirm severity.
Coding tip
Confirm both elements—localized and severe—before assigning K05.313, because missing either detail can change the code.