No later than January 1, 2018 and every three (3) years thereafter, the cost and financial data used to determine the APM rate shall be updated based upon audited cost reports that reflect costs that are two (2) years prior to the base year and in accordance with the methodology set forth in Sections 4503, 4504, 4505, and 4506.
D.C. Mun. Regs. tit. 29, r. 29-4516