Uber/Lyft, neighbor, ambulance - not necessarily in that order.
I may have had as many medical appointments, ER and urgent care clinic visits in 2018 as bike rides. Those three worked for me when I wasn't able to take the bus, ride my bike or walk.
I think I did ride my bike once to an ortho follow-up after I was hit by a car. But a thyroid issue and surgery for cancer later in the year sapped my energy, so I mostly used the bus, taxis or friends.