DecisionHealth provides a nice overview of the CPT changes for year 2018; see the link below.
In the blog post, you’ll find that a total of 314 code changes throughout your 2018 CPT manual, including updates that range from revised observation visits in the E/M chapter to new photodynamic therapy services in the Medicine chapter and two new modifiers. The CPT 2018 manual contains a total of 172 new codes and 60 revised codes. In addition, 82 were deleted, according to a DecisionHealth analysis of Appendix B, the summary of changes for the newly released manual. The manual also contains revised guidance, such as clarifications to help you report initial observation care (99218-99220) and prolonged services (99354-99357).