The 2019 ICD-10-CM codes go into effect on October 1, 2018. There are 473 changes (279 new ICD-10 codes, 51 deleted codes, and 143 revised codes) to know, understand and begin using in a short time. This link contains a text file of the codes that were added, deleted and revised: ftp://ftp.cdc.gov/pub/Health_Statistics/NCHS/Publications/ICD10CM/2019/icd10cm_codes_addenda_2019.txt
This CDC page contains links to the electronic versions of the tabular and index sections and other helpful materials. https://www.cdc.gov/nchs/icd/icd10cm.htm