Medicare Part B premiums and deductibles will increase by 11.6% in 2026, while Medicare Advantage and standalone Part D premiums may decrease. The Part D catastrophic threshold rises to $2,100. New rules limit supplemental benefits in Medicare Advantage, and prior authorization expands in six states. Medicare will negotiate prices for 10 drugs, further lowering insulin costs. Some dual-eligible enrollees may lose Medicaid access due to new requirements.