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Year Prior Estimates of Annual Percentage Trend Revised Annual Percentage Trend 2009 3.14% 3.14% 2010 2.36% 2.36% 2011 2.15% 2.15% 2012 2.53% 2.53% 2013 -3.14% -3.14% 2014 10.12% 10.12% 2015 9.89% 9.89% 2016 4.02% 4.02% 2017 1.87% 1.87% 2018 4.06% 4.06% 2019 4.92% 4.92% 2020 5.06% 5.06% 2021 4.69% 4.68% 2022 7.36% 7.36% 2023 9.57% 9.54% 2024 5.46% 4.07% Accordingly, the CY 2026 benefit parameters reflect a multiplicative update of -1.34 percent for prior year revisions. In summary, the 2025 parameters outlined in Section A are updated by 4.27 percent for 2026, as summarized by Table V-4. Table V-4. Annual Percentage Increase Annual percentage trend for July 2025 5.69% Prior year revisions -1.34% Annual percentage increase for 2026 4.27% Note: Percentages are multiplicative, not additive. Values are carried to additional decimal places and may not agree to the rounded values presented above. Annual Percentage Increase in Consumer Price Index, September (September CPI) To ensure that plan sponsors and CMS have sufficient time to incorporate cost-sharing requirements into the development of the benefit, any marketing materials, and necessary systems, CMS includes in its methodology to calculate the annual percentage increase in the CPI for the 12-month period ending in September 2025, an estimate of the September 2025 CPI based on projections from the President’s FY2026 Budget. The September 2025 value is from the Bureau of Labor Statistics. The annual percentage trend in the September CPI for CY 2026 is calculated as follows: