ICD-10 Code K00.4 – Disturbances in tooth formation (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K00.4 – Disturbances in tooth formation
What it is
K00.4 identifies developmental abnormalities in how teeth form. Use it when the tooth structure, shape, or number is abnormal because formation was disturbed during development.
Clinical signs
Findings may include malformed, small, or missing tooth portions, delayed eruption, or teeth with abnormal shape or size. Clinical features vary; refer to documentation.
When to use this code
Use K00.4 when the record documents a congenital or developmental disturbance of tooth formation, such as abnormal enamel or tooth shape from disrupted development. It is appropriate when the provider links the dental abnormality to formation rather than trauma or decay. Check documentation if the cause is unclear.
Do not use for
Do not use this code for caries, fractures, wear, or other acquired tooth damage. If the problem is a different developmental dental disorder, select the more specific documented code.
Coding tip
Code from the provider’s exact developmental description and avoid assuming etiology when the note does not clearly state tooth formation disturbance.