I was working when I turned 65 so I enrolled in Medicare part A, but it was possible to defer enrollment into part B until I retired from my job, which was about six months after I turned 66. In this case, there was no penalty for delaying the enrollment into part B Since I had private insurance through Work. My guess is the OP is in a similar situation.Now!!
Did you opt for Part B coverage. If so Medicare will be primary for both major medical and doctors fees. If its decent private insurance it will be secondary and pick up what Medicare does not pay.
In the last two years I have had tens of thousands of dollars in medical expenses and with Medicare Parts A and B plus BCBS not a cent out of my pocket. Currently waiting on a $1.5M lung transplant that I could not afford otherwise.
Dan
If I remember correctly when you’re working and have private insurance, the private insurance is the primary payer. I don’t remember Medicare paying anything when I had private insurance and still working while enrolled in Medicare Part A.