Sounds like you might have received a bill for a medigap policy or a Medicare Advantage plan. I too am on SSD at age 62 due to heart issues. I pay $99/month for Part A, then about $350/month for medigap (medigap is much higher for those on Medicare due to SSD), and about $40/month for Part D drug coverage. If I were you, I would call you state SHIIP office and ask what's going on. They probably will be able to explain the situation, fraud or whatever. Good luck.