The Mayo Clinic allowed Pence to visit and even meet with a patient without as mask.

His argument, that he is tested "regularly" for the coronavirus and therefore knows he can't transmit virus to anyone else, is not absurd. However, we don't know how frequently "regularly" is. If it is once a week, he might become infected and start transmitting virus between tests.

In any case, there was no reason for the hospital to make an exception for him. I expect the hospital management were afraid of reprisals if they did not.