Ankylosis of teeth

This code represents the pathological fusion of a tooth root to the alveolar bone, preventing normal physiological tooth movement. It results in the absence of a periodontal ligament space and can affect both primary and permanent dentition.

Use this code when documentation explicitly states "ankylosis of teeth" or describes a tooth that is fused to the bone, often identified radiographically by the absence of a periodontal ligament. This is commonly seen in cases of submerged primary molars or impacted permanent teeth.

• Differentiate from impaction (520.6) or embedded teeth, which are not necessarily fused to bone.
• Specify the affected tooth or teeth if documented, though this code does not allow for laterality.
• Consider any associated conditions, such as malocclusion (524.x), and code them separately.