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Attachment I. Final Estimates of the National Per Capita Growth Percentage and the National Medicare Fee-for-Service Growth Percentage for CY 2026 Table I-1 below shows the National Per Capita MA Growth Percentage (NPCMAGP) for CY 2026. An adjustment of 3.53 percent for the combined aged and disabled cohort is included in the NPCMAGP to account for corrections to prior years’ estimates as required by section 1853(c)(6)(C). The combined aged and disabled change is used in the development of the ratebook. Table I-1. Increase in the NPCMAGP for CY 2026

Prior increases Current increases NPCMAGP for 2026 with § 1853(c)(6)(C) adjustment1

2003 to 2025 2003 to 2025 2025 to 2026 2003 to 2026 Aged + Disabled 117.505% 125.191% 6.943% 140.826% 10.72% 1 Current increases for 2003-2026 divided by the prior increases for 2003-2025. Table I-2 below provides the change in the FFS United States Per Capita Cost (USPCC), which was used in the development of the county benchmarks. The percentage change in the FFS USPCC is shown as the current projected FFS USPCC for CY 2026 divided by projected FFS USPCC for CY 2025 as estimated in the CY 2025 Rate Announcement released on April 1, 2024. Table I-2. FFS USPCC Growth Percentage for CY 2026 Aged + Disabled Dialysis–only ESRD Current projected 2026 FFS USPCC $1,230.52 $10,372.92 Prior projected 2025 FFS USPCC $1,130.85 $9,713.00 Percent change 8.81% 6.79% Table I-3 below shows the monthly actuarial value of the Medicare deductible and coinsurance for CYs 2025 and 2026. In addition, for CY 2026, the actuarial value of deductibles and coinsurance is being shown for non-ESRD only, since MA plan bids for CY 2026 exclude costs for ESRD enrollees. These data were furnished by the Office of the Actuary.