ICD-9-CM 520.1 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 520.1 should only be used for claims with a date of service on or before September 30, 2015. For claims with a date of service on or after October 1, 2015, use an equivalent ICD-10-CM code (or codes).
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
Supernumerary tooth, any tooth in addition to the normal permanent and primary dentition