Convert to ICD-10-CM: 
521.89 converts approximately to:
- 2015/16 ICD-10-CM K03.89 Other specified diseases of hard tissues of teeth
 
 ICD-9-CM Volume 2 Index entries containing back-references to 
521.89:
- Decalcification
teeth 521.89
 - Dentin
sensitive 521.89
 - Disease, diseased - see also Syndrome
 - Irradiated enamel (tooth, teeth) 521.89
 - Sensitive dentine 521.89