521Diseases of Oral Cavity, Salivary Glands, and Jaws: Dental caries, other diseases of hard tissues of teeth
Diseases of the Digestive System
What this reference tells you
521 is an Ontario diagnostic code describing “Diseases of Oral Cavity, Salivary Glands, and Jaws: Dental caries, other diseases of hard tissues of teeth.” It supports the diagnosis field of a claim and is distinct from the fee code identifying the service.
Before using this code
Confirm the current Ministry publication, the patient and provider context, the date of service, and documentation supporting the claim. A searchable reference does not establish eligibility or guarantee payment.