Medicare Part B covers outpatient medical services like doctor visits, preventive care, durable medical equipment, and more.​

Enrollment

If you’re already receiving Social Security benefits when you turn 65, you’ll typically be enrolled in Part B automatically. If not, you’ll need to sign up during your Initial Enrollment Period, which begins three months before the month you turn 65 and ends three months after.​

If you delay enrollment without qualifying for a Special Enrollment Period (such as having employer-sponsored coverage), you may face a late enrollment penalty. This penalty adds 10% to your monthly premium for each full 12-month period you were eligible but didn’t enroll, and you’ll pay this higher premium for as long as you have Part B.​

Costs in 2025

• Standard Monthly Premium: $185​

• Annual Deductible: $257

After meeting the deductible, you typically pay 20% of the Medicare-approved amount for most services.​

Income-Related Monthly Adjustment Amount (IRMAA)

If your Modified Adjusted Gross Income (MAGI) from two years ago (2023 for 2025 premiums) is above certain thresholds, you’ll pay an additional amount on top of the standard premium:​

Individual MAGI	Joint MAGI	Total Monthly Premium (2025)
$106,000 or less	$212,000 or less	$185.00
$106,001 – $133,000	$212,001 – $266,000	$259.00
$133,001 – $167,000	$266,001 – $334,000	$370.00
$167,001 – $200,000	$334,001 – $400,000	$480.90
$200,001 – $500,000	$400,001 – $750,000	$591.90
$500,001 or more	$750,001 or more	$628.90

Note: If you’re married and file separately, different thresholds apply.

If you believe your IRMAA is incorrect due to a life-changing event (like retirement or loss of income), you can request a reconsideration from the Social Security Administration.