ICD-10 Code K00.9 – Disorder of tooth development, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K00.9 – Disorder of tooth development, unspecified
What it is
K00.9 identifies a disorder affecting how a tooth develops, when the specific type is not documented. Use it when the record confirms abnormal tooth formation but does not name a precise developmental defect.
Clinical signs
Clinical features vary; refer to documentation. Findings may include abnormal tooth shape, size, number, or eruption pattern, but the exact developmental problem is not specified in the chart.
When to use this code
Use K00.9 when a provider documents a developmental tooth disorder and gives no further detail. It fits cases where the chart says “tooth development disorder” or similar wording without a clearer diagnosis.
If the note later identifies a specific anomaly, code that more precise condition instead. For uncertain records, you should code only what is documented and avoid assuming the exact defect.
Do not use for
Do not use this code for acquired tooth damage, dental caries, or eruption problems that are separately documented. Check documentation if the condition is described as a specific developmental anomaly.
Coding tip
Query for the exact developmental abnormality when the record is vague, because K00.9 is only for unspecified tooth development disorder.