ICD-10 Code K08.121 – Complete loss of teeth due to periodontal diseases, class I (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K08.121 – Complete loss of teeth due to periodontal diseases, class I
What it is
K08.121 identifies complete loss of teeth caused by periodontal disease, class I. Use it when documentation states the edentulism is due to periodontal destruction rather than trauma, caries, or congenital absence.
Clinical signs
Typical findings include missing natural teeth with a documented periodontal cause. Clinical features vary; refer to documentation for the specific extent of tooth loss and periodontal history.
When to use this code
Use this code when the record clearly links total tooth loss to periodontal disease and specifies class I. It is appropriate for dental or medical documentation describing complete edentulism from periodontal breakdown, not for general tooth loss without cause.
Do not use for
Do not use it for tooth loss from trauma, extraction, caries, or congenital absence. If the cause or class is not documented, check documentation before assigning K08.121.
Coding tip
Confirm both the periodontal cause and the class designation in the chart before coding.