Current Dental Terminology
Current Dental Terminology (CDT) is a code set with descriptive terms developed and updated by the American Dental Association (ADA) for reporting dental services and procedures to dental benefits plans. Prior to 2010 many of the codes were published by Centers for Medicare and Medicaid Services (CMS) as HCPCS D-codes under arrangement with the ADA. Ownership and copyright of CDT remained with the ADA. In 2010 the ADA ended the CMS distribution of CDT codes, which can now be purchased from the ADA. For the year 2013, the ADA began publishing the CDT codes on an annual basis.
Source: Wikipedia — Current Dental Terminology (CC BY-SA 4.0)