Hi Jill! Great question. There is not necessarily a trick, but it can get confusing on certain procedures that don”t have a direct crosscode from dental coding to medical – and this is one of those services! When there is a not a code that accurately describes the services that was provided available, you end up using an “unlisted” or “by report” or “miscellaneous” CPT code, and providing a description of the service that the code is being used to represent. D4321 – provisional splinting – extracoronal The code listed above does not have a direct crosscode we are aware of, so you can either bill the “D” code on the medical claim (many insurers these days will process “D” codes when they are medically necessary services), or you can use the CPT code below and include a narrative report describing the procedure: 41899 – Unlisted procedure, dentoalveolar structures Hope this helps!