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 > Disorders Of Tooth Development And Eruption 520.* > 2008 ICD-9-CM Diagnosis 520.1 Supernumerary teeth  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 Therefore, this code may be out of date.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 520.1 can be accessed here. An extra tooth, erupted or unerupted, resembling or unlike the other teeth in the group to which it belongs. Its presence may cause malposition of adjacent teeth or prevent their eruption. 520.1 is a specific code that can be used to specify a diagnosis 520.1 contains 8 index entries View the ICD-9-CM Volume 1 520.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. 520.1 also known as: Distomolar Fourth molar Mesiodens Paramolar Supplemental teeth 520.1 excludes: supernumerary roots (520.2) Index entries containing 520.1: Accessory (congenital) teeth, tooth 520.1 causing crowding 524.31 Distomolar (fourth molar) 520.1 causing crowding 524.31 Excess, excessive, excessively number of teeth 520.1 causing crowding 524.31 Fourth molar 520.1 Mesiodens, mesiodentes 520.1 causing crowding 524.31 Paramolar 520.1 causing crowding 524.31 Supernumerary (congenital) teeth 520.1 causing crowding 524.31 Supplemental teeth 520.1 causing crowding 524.31