There should be a way to "inactivate" a deleted CDT code so that it does not show up as an available code to use when there are CDT changes. Currently, I change to "DO NOT USE IN 2019".
Thank you for the recommendation, we are always looking for ways to improve the product. There is a current feature that we recommend you to look at by browsing to our knowledgebase. please see the link and article below.
https://www.dentrix.com/support/resource-center
Article: 34908