Convert to ICD-10-CM: 
521.07 converts approximately to:
- 2015/16 ICD-10-CM K02.61 Dental caries on smooth surface limited to enamelOr: 
- 2015/16 ICD-10-CM K02.62 Dental caries on smooth surface penetrating into dentinOr: 
- 2015/16 ICD-10-CM K02.63 Dental caries on smooth surface penetrating into pulp