2024 Medicare Part B Irmaa Premium Brackets. The government adjusts the income brackets every year to reflect changes in the cost of living. A medicare part b irmaa applies to these enrollees as well.

By law, medicare part b premiums must cover 25% of the costs incurred by that part of the program. Medicare part b serves as medical insurance and covers doctor and other provider services, outpatient care, home health care, durable medical equipment and some preventive.