CDA encourages dentists to prepare for CDT 2020 dental code additions, revisions and deletions that go into effect Jan. 1, 2020. The new year will bring 37 new and five revised codes, plus six deleted codes. While dental plans are required to recognize current CDT codes, it is important to keep in mind that they are not required to pay for or provide benefits for the new or revised codes. Dentists should review each dental plan’s payment and processing guidelines to determine whether benefits will be payable.