Medicare Irmaa 2025 Brackets And Premiums. The irmaa for part b and part d is calculated according to your income. On october 12, 2023, the centers for medicare & medicaid services (cms) released the 2025 premiums, deductibles, and coinsurance amounts for the medicare part a and part b.
To determine whether you are subject to irmaa charges, medicare uses the adjusted gross income you reported on. The base monthly premium for part b will be $185.00, an increase of $10.30 (5.9%) from $174.70 in 2025.