How much is taken out of retiree social security check by government for medicare etc?

Part A premiumMost people don't pay a monthly premium for Part A (sometimes called "premium-free Part A"). If you buy Part A, you'll pay up to $413 each month. If you paid Medicare taxes for less than 30 quarters, the standard Part A premium is $413. If you paid Medicare taxes for 30-39 quarters, the standard Part A premium is $227.

Part B premiumThe standard Part B premium amount is $134 (or higher depending on your income). However, most people who get Social Security benefits will pay less than this amount ($109 on average).