Thats surprising,,,,my insurance dropped me when I was 65, saying I was no longer eligible for coverage because I was medicare eligible.
It was like automatic...within days of my birthday.
That’s good that they notified you. This was about ten years ago and I don’t know the insurance company. Knowing my friend he may well have gotten a notice, didn’t read it, and pitched it into the trash as junk mail.
My girlfriend is a civilian employee at a U.S. military base, just turned 65 this month, and her employer-provided private coverage will continue, although she has the option to join Medicare. I have not heard of a provider rejecting this type of insurance, over 65 or not.