Social Security & Medicare

is what you pay for during your working years. When you hit 65 Part B (doctors, labs, tests, etc.) kicks in and you will have to pay whatever the Medicare portion is. Usually, this is taken out of your Social Security check unless you opt to pay monthly or quarterly. I think 2026 the cost is around $206 per month. You can suspend Part B coverage if you are still working and getting medical coverage from your job. You HAVE to let Medicare know that you want to do this as Part B starts automatically when you turn 65. If you have original Medicare, you will need a supplement ~ those are Plan A-Z and offer different coverage. Different companies offer these plans and the costs can vary but the coverage is the same. They don't cover hearing, eyes, dental or prescription. You will have to get separate coverage for those. Prescription coverage is Part D.
The Medicare Advantage (Medigap) is Part C. Those are the ones that have ads on TV 24/7. Hope this helps.
If you are still working, check with your HR person. They can or should be able to help you.