All I have is Medicare and I never have payed anything for it.
The doctors, hospitals, etc bill Medicare outlandish big bills and Medicare knocks about 90% off, then I have to pay 20% of that as my part.
Take a look at your FORM SSA-1099 - SOCIAL SECURITY BENEFIT STATEMENT for 2019, which you should receive in the mail or can download if you have signed up for an online account with the SSA. In the left column there is a box labeled "Medicare Part B premiums deducted from your benefits"
That deduction is your current payment of "premium". Social Security's picking up of the other part of the total "premium", that you are entitled to receive, is some payback of all those thousands of dollars that were deducted from at least 40 quarters (10 years)-- and probably a lot more--worth of your paychecks.
Some people never get sick, but keel over dead from a heart attack at a young age. Good thing for the government and the rest of us and the continued solvency of Medicare. Bad deal for the individual.
I know an individual who has run up what is probably close to $500 grand of medical in last couple of years. That would be bad for Social Security/Medicare. They luck out though, cuz he's retired worker with forever benefits from local gov't; and also, he is still covered by his deceased wife's (RIP) benefit also, local gov't (schoolteacher). "They" (taxpayers of Fresno County and City) are on the hook as first payers before Medicare.
Moral: get yourself a sweet deal government job (wife too!). Get em' soon cuz sweet deals is driving those entities very deeply into an unfunded liability hole, and can't last forever...just my $0.02