You have found a business with a Service Area rather than a physical address. Normally this is used by plumbers and locksmiths to indicate the area where they can serve their customers.
Unfortunately, Local Guides can not edit this or change it into normal business with an address rather than a service area. My best bet is you should contact the Hospital and ask them to fix their listing on Google Maps. Or you can try leaving feedback. The latter is seldom very effective in my experience.
I certainly agree that a hospital with an emergency department should have an address. Unless they only take patients arriving on their own ambulances.
Cheers
Here is a link to the help pages for Service Area Businesses