ICD-10 Code K08.423 – Partial loss of teeth due to periodontal diseases, class III (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K08.423 – Partial loss of teeth due to periodontal diseases, class III
What it is
K08.423 identifies partial tooth loss caused by periodontal disease, specifically class III severity. Use it when documented periodontal destruction has resulted in loss of some teeth, not complete edentulism.
Clinical signs
Typical documentation may note missing teeth, advanced periodontal attachment loss, or a history of tooth loss attributed to periodontitis. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly links partial tooth loss to periodontal disease and specifies class III. It is appropriate for dental or medical notes describing tooth loss from chronic periodontal destruction. If the cause or class is not documented, check documentation.
Do not use for
Do not use it for tooth loss from trauma, caries, congenital absence, or nonperiodontal causes. Do not assign it when the chart only says “missing teeth” without a periodontal etiology.
Coding tip
Confirm both the periodontal cause and the class III designation before coding.