Section 425.650 - Benchmarking methodology(a)Scope and purpose. The methodology by which CMS establishes, adjusts, updates and resets an ACO's historical benchmark is described within this subpart G. The benchmarking methodology for agreement periods beginning before January 1, 2024, is specified in §§ 425.601 , 425.602 , 425.603 , and 425.659 . The benchmarking methodology for agreement periods beginning on or after January 1, 2024, is specified in §§ 425.652 through 425.660 . 87 FR 70243 , Nov. 18, 2022, as amended at 88 FR 79548 , Nov. 16, 2023 87 FR 70243 , 1/1/2023; 88 FR 79548 , 1/1/2024