Core Insights - The 2026 Medicare Part B premium increased to $202.90 per month, representing a 9.7% rise from $185.00 in 2025, which coincides with a 2.8% Social Security cost-of-living adjustment [2][9] Premium Impact on Retirees - For the average retiree, the Social Security COLA added approximately $54 to their monthly check, but the Medicare premium hike effectively reduced this gain by about $18, resulting in a net gain that feels minimal for up to 30 million traditional Medicare enrollees [3][9] Factors Driving Premium Increases - Three main factors are contributing to the rising costs of Medicare Part B premiums: 1. Oil prices have surged nearly 48% since mid-February 2026, affecting healthcare delivery costs [6][9] 2. Potential tariff-driven cost increases on medical supplies and pharmaceuticals are impacting overall expenses [6][9] 3. A congressional report indicated that overpayments to Medicare Advantage plans have added $82 billion in extra Part B costs over the past decade, highlighting a structural issue that remains unresolved [6][9] National Healthcare Spending Trends - National healthcare spending has consistently risen every month since January 2025, increasing from $3,432.2 billion to $3,701.9 billion by January 2026, which limits the Centers for Medicare and Medicaid Services' ability to keep premiums stable [7]