@vignalicreations, Welcome to Connect. I work in the Transplant Center at Mayo Clinic in Minnesota. Your referral can happen in two ways. You are welcome to call yourself, ask your questions and ask for an appointment. This is fine with Mayo as long as your doctors have given you your records so we can review those. However, you may wish to check with your insurance company to be sure they cover Mayo, and to be sure they don't require a physician referral. In the other instance, your doctors are welcome to call our offices as well to refer you. Our staff can let them know where to send your records for review. Mayo in AZ and FL both work in a similar fashion. You or your doctors can contact us using this information when you are ready: https://www.mayoclinic.org/departments-centers/heart-transplant/contact-us/occ-20212193. Best wishes to you!