2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Digestive System 520-579 > Diseases Of Oral Cavity, Salivary Glands, And Jaws 520-529 > Diseases Of Hard Tissues Of Teeth 521.* > 2008 ICD-9-CM Diagnosis 521.30 Erosion, unspecified  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 521.30 can be accessed here. 521.30 is a specific code that can be used to specify a diagnosis 521.30 contains 4 index entries View the ICD-9-CM Volume 1 521.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. Index entries containing 521.30: Erosion dental (idiopathic) (occupational) 521.30 extending into dentine 521.32 pulp 521.33 generalized 521.35 limited to enamel 521.31 localized 521.34 teeth (idiopathic) (occupational) (see also Erosion, dental) 521.30 due to medicine 521.30 persistent vomiting 521.30