I don't know if you looked into MT Sinai Hospital, in NY City. They perform miracles. I speak from experience. They have the best Cardiac center in the north east. When I was there, there were patients from all over the US and Europe. Dr. David Adams, has invented several procedures and techniques for Valve replacements, repairs, and even transplants. Google his name and take a look. Just another option for you. There were plenty of patients in their 90s. I made friends with a man, 85, that came up from Florida for an Aortia Valve. He went back home before I did.... Medicare and all insurance accepted. I will only go to MT Sinai, and the local hospital is only one mile from my house.
Either way best of luck, and prayers sent'...