As of October 1, 2018, 365 new ICD10 2019 codes have been released. Any encounter on or after October 1, will automatically use the new codes. Visits prior to October 1, will use the 2018 version.

Link to 365 new codes:

https://www.icd10data.com/ICD10CM/Codes/Changes/New_Codes

Link to 172 changed codes:

https://www.icd10data.com/ICD10CM/Codes/Changes/Revised_Codes