Cost For Medicare Part B In 2025. Each year, the cost of part b premiums, deductibles, and coinsurance is set based on the social security act. Starting january 2025, the standard medicare part b premium will increase to $185 per month, up from.

That’s an increase of $10.30. In 2025, the part b premium will be $185, an increase of $10.30 from this year and $20.10 more than in 2023.