ICD-10 Code K08.403 – Partial loss of teeth, unspecified cause, class III (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K08.403 – Partial loss of teeth, unspecified cause, class III
What it is
This code identifies partial tooth loss when the cause is not specified and the patient is classified as class III. Use it when documentation confirms this exact degree of tooth loss and no more specific cause is recorded.
Clinical signs
Findings usually include missing teeth with remaining dentition still present. Clinical features vary; refer to documentation for the recorded extent of loss and any stated class assignment.
When to use this code
Use K08.403 when the record states partial loss of teeth, unspecified cause, class III, and no etiology is documented. It may apply in dental or medical notes describing tooth loss without specifying trauma, periodontal disease, or other causes. Check documentation if the class is unclear.
Do not use for
Do not use this code if the cause of tooth loss is documented more specifically, or if the chart does not support class III. Avoid using it for complete edentulism or other oral conditions unrelated to partial tooth loss.
Coding tip
Match the class designation exactly as documented; if class III is not stated, verify the record before assigning K08.403.