ICD-10 Code K02 – Dental caries (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K02 – Dental caries
What it is
K02 identifies tooth decay, also called dental caries. It is used when the tooth structure has been damaged by demineralization and breakdown from caries.
Clinical signs
Common findings include visible enamel or dentin breakdown, cavitated lesions, tooth discoloration, or sensitivity. Clinical features vary; refer to documentation.
When to use this code
Use K02 when the record documents active dental caries affecting one or more teeth. It fits routine dental exams, problem visits, or referrals that specifically note decay. If the note only says “tooth pain” or “needs dental work,” check documentation before coding.
Do not use for
Do not use this code for gingivitis, periodontal disease, fractured teeth, or other non-caries dental problems. If the provider does not document caries, check documentation.
Coding tip
Code K02 only when the chart clearly supports caries, and capture any documented severity or site-specific detail if available.