ICD-10 Code K03.5 – Ankylosis of teeth (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K03.5 – Ankylosis of teeth
What it is
K03.5 identifies ankylosis of teeth, a condition where a tooth becomes fused to the surrounding bone and loses its normal periodontal ligament space. You use it when the record specifically documents ankylosis.
Clinical signs
Clinical features may include a tooth that does not erupt normally, appears infraoccluded, or sounds dull on percussion. Clinical features vary; refer to documentation.
When to use this code
Use K03.5 when the dentist or oral surgeon documents ankylosis of a tooth, whether found on exam or imaging. It may also apply when a retained primary tooth or impacted tooth is described as ankylosed. Code it only when the diagnosis is explicit.
Do not use for
Do not use this code for ordinary tooth impaction, delayed eruption, or mobility problems without documented ankylosis. Check documentation if the note only says “stuck,” “retained,” or “unerupted.”
Coding tip
Look for wording such as “ankylosed tooth” or “fusion to bone” before assigning K03.5.