I remember when I was covered under my father's Medicare # with a C2 added to the end because I was 22 and put on dialysis in 1973.
I kept that number when I had a transplant in '87' which rejected in 2001.
I eventually went on my own Social Security number because I applied for disability in 2006 when they explained to me that you have to notify SS / Medicare if any changes occur in job status, marital status or whether you received a transplant.
I have never applied for disability. I scared that the Medicare does not know I had transplant although they paid the transplant operation cost as primary. I assumed that they knew I had transplant. Thanks