ICD-10 Code K08.401 – Partial loss of teeth, unspecified cause, class I (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K08.401 – Partial loss of teeth, unspecified cause, class I
What it is
K08.401 identifies partial loss of teeth when the cause is not specified and the loss is classified as class I. Use it when the record documents missing teeth but does not name a more specific etiology.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include one or more absent teeth, altered bite, or visible gaps in the dentition, but the record should support the diagnosis and class designation.
When to use this code
Use this code when the provider documents partial tooth loss, unspecified cause, and class I. It fits dental or medical notes that confirm missing teeth without identifying trauma, caries, periodontal disease, or another cause. Check documentation if the class is unclear.
Do not use for
Do not use it for complete tooth loss or for partial loss with a documented cause that has a more specific code. Do not assign it if the chart does not support class I.
Coding tip
Verify the exact wording in the note; unspecified cause and class I must both be documented before you code K08.401.