I would simply call and ask for appointment for transplant department on general. It is team approach, with ulti many departments involved. My initial appointment was with two doctors for basic intake and review of medical history and records. They approve me for assessment to the transplant team. From there, I went through a three yo four dsy intake assessment, meeting doctors a running through extensive testing to see if I was sn appropriate candidate who would qualify for transplant or if I needed transplant. They monitor health closely. My doctor called and made my referral based on my testing with him after referral and approval, mayo took the reins do to speak. Make a call! There is hope out there.

Hi, @vandi.
I am a patient, and was referred to Mayo Clinic by my local transplant team after I had complications that needed specialists at Mayo. However, a patient can contact Mayo Clinic directly to inquire about an appointment as @mkjogan has replied. Or - the patient's doctor can make a referral.

Here is the contact information for the liver transplant department at Mayo. (Arizona, Florida, Minnesota) Mayo Clinic transplant staff can answer your questions.
https://www.mayoclinic.org/departments-centers/liver-transplant/home/orc-20211818
.
@vandi, Is your brother currently under the care of a liver specialist? Have you spoken with him about referral to either Mayo or a regional transplant center near you?