​​Thank you for the question. Please note that the chart abstracted measure (CAM) PC02 refers to Table 1.09 which combines many of the value sets used by ePC02. When ePC02 was developed the table was broken down into smaller value sets, direct reference codes, and redundant coding was removed that is applied within the logic. As updates are applied to the CAM version (typically twice a year), the same changes will be applied to eCQM during the annual update process which occurs only once. We will continue to add new value sets or codes to existing value sets based on the updates to the CAM version. Please see the attachment for a detailed comparison of the 2 measures.