2025 Irmaa Brackets Part B Premiums. One of the direct consequences of irmaa is the increase in monthly premiums for medicare part b and part d coverage. A medicare part b irmaa applies to these enrollees as well.
In 2025, the standard part b monthly premium is $174.70. Irmaa is a fee that may be added to your medicare part b and part d premiums if your yearly income exceeds a certain amount.