The January 2024 quarterly codes are updated for the Healthcare Common Procedure Coding System (HCPCS) and Proprietary Laboratory Analyses (PLA) codes issued by the American Medical Association (AMA) and the Centers for Medicare and Medicaid Services (CMS). The January quarterly code update is effective Monday, Jan. 1, 2024. Please refer to the AMA and CMS websites for a complete list of added, revised, and deleted codes.