ICD-10 Code K05.4 – Periodontosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K05.4 – Periodontosis
What it is
K05.4 identifies periodontosis, a periodontal condition involving loss of the supporting tissues around teeth. Use it when the record specifically documents this diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include loosening of teeth, gum changes, and supporting tissue loss, but you should only code what is clearly recorded.
When to use this code
Use K05.4 when the clinician documents periodontosis as the diagnosis and the note supports periodontal tissue involvement. It may appear in dental or oral health records describing chronic support loss around teeth. If the chart uses a different periodontal diagnosis, code that term instead.
Do not use for
Do not use this code for gingivitis, periodontal abscess, or generalized periodontitis unless periodontosis is specifically documented. Check documentation if the provider uses older or unclear terminology.
Coding tip
Code the exact periodontal term documented; if “periodontosis” is not explicit, query the provider before assigning K05.4.