as mentioned above the address of the hospital as a whole is on Alton road, what doesn't mean that the road within the hospital is Alton road. ways like https://www.openstreetmap.org/way/1002417849 already have Alton road on them, this doesn't mean that the road you tagged as Alton road within the hospital is, it just means that hospital as a whole is, including the buildings that are part of the hospital.