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Attachment V. Final Updated Benefit Parameters for the Defined Standard Benefit and Changes in the Payment Methodology for Medicare Part D for CY 2026 Table V-1. Updated API and CPI for 2026

Annual percentage trend for 2025 Prior year revisions API for 2026 API 5.69% 2 33% -1.34% 4.27% September CPI (all items, U.S. city average) 2.33% -0.17% 2.16% Table V-2. Updated Part D Benefit Parameters for Defined Standard Benefit, Low-Income Subsidy (LIS) and Retiree Drug Subsidy

2025 202620 Standard Benefit

Deductible $590 $615 Out-of-Pocket Threshold $2,000 $2,100 Full Subsidy-Full Benefit Dual Eligible (FBDE) Beneficiaries (1)

Deductible $0.00 $0.00 Copayments for Institutionalized Beneficiaries [category code 3] $0.00 $0.00 Copayments for Beneficiaries Receiving Home and Community-Based Services] [category code 3] (2) $0.00 $0.00 Maximum Copayments for Non-Institutionalized Beneficiaries

Up to or at 100% FPL [category code 2]

Up to Out-of-Pocket Threshold

Generic/Preferred Multi-Source Drug $1.60 $1.60 Other $4.80 $4.90 Between 100% and 150% of FPL [category code 1]

Up to Out-of-Pocket Threshold

Generic/Preferred Multi-Source Drug $4.90 $5.10 Other $12.15 $12.65

20 These parameters reflect additional plan coverage required for covered insulin products under section 1860D-2(b)(9) of the Act, as added by section 11406 of the IRA, and ACIP-recommended adult vaccines under section 1860D-2(b)(8) of the Act, as added by section 11401 of the IRA.