I don't know what is 'mandatory' but can share our experience. We moved to Arizona from California once he was listed. Within 10 days were were blessed with a transplant. Two months after transplant, and a pretty easy recovery, we were told we could go home. He gets weekly blood tests done, which I print out and send to Mayo Clinic, via their patient portal. We returned to Arizona for one day of tests and appointments five months after transplant. There have been a number of zoom video sessions, a ton of messages back and forth and a number of phone calls, some after hours due to continuing bumps in the road to recovery.
Mayo has been there for us whenever we need them. We will be returning to Arizona, for a one year follow-up in January.
We considered transferring his care to a local transplant clinic, something they were willing to do, but decided to stay with Mayo Clinic. It has been a challenge at times with the need to have ultrasounds and low white blood count required injections. We are blessed with a wonderful local dr willing to help with these needs.