Social Security Issues: SSDI Insurance Confusing

It has been a long time since I have been back on this forum possible a few years I do not recall or remember. Anyways I am on SSDI and have been for maybe two years now. I am a little confused on the insurance part all together. I was getting Tenn Care and Medicare both for almost two years, Recently when it came time to renew Tenn Care dropped my insurance since I am getting SSDI instead of SSI this is how I understand it anyways. I have tried several times to contact social security and medicare and it always seems as though I am unable to speak to a live person on the phone other then some kind of voice recording. I am needing to know what or how much I will be required to pay when I go to my Dr like for a Dr visit. I understand that the card states on it that I have A and B and D which is extra help for med's but this is all that I know. The reason I am asking is because Tenn Care failed to notify prior to dropping my coverage and now I have bills that have been non paid. Can someone please help clarify this for me and how it works. I have always been required to pay some on my med's but since Tenn Care dropped me will I now be required to pay a co pay when I see my Dr for a visit also? So if I am hospitalized in the near future will I be required to pay a huge hospital bill that I already cant pay? Thank You

Social Security Issues: SSDI Insurance Confusing