ICD-10 Code K08.51 – Open restoration margins of tooth (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K08.51 – Open restoration margins of tooth
What it is
K08.51 identifies a dental finding where the edge of a restoration, such as a filling or crown, is open or not sealed against the tooth. This code describes the condition of the restoration margin, not a specific disease.
Clinical signs
You may see a visible gap, rough margin, or staining at the restoration edge. Clinical features vary; refer to documentation, but charted findings often note leakage, food trapping, or marginal breakdown.
When to use this code
Use this code when the record documents an open margin on a dental restoration and the provider identifies it as the relevant finding. It is appropriate for dental exams, problem lists, or referrals describing a defective restoration margin. Check documentation if the note only mentions pain, decay, or a broken filling without margin detail.
Do not use for
Do not use this code for caries, fractured restorations, or generalized tooth wear unless an open margin is specifically documented. If the chart does not state an open restoration margin, check documentation.
Coding tip
Code K08.51 only when the margin defect is clearly documented, and do not assume it from a loose or failed restoration alone.