In hospitals and other professional situations physicians are usually addressed as, or referred to as, "Doctor."
Call the Hospital.
Radiologist.
A Patient
Someone who works in a nursery, caring for children usually from the age of 0-4.
Call hospital
Tech Person
a slave
Employee
You just call them a patient or you could just call them a person.
someone who works for a business
In the UK - we call them an 'out-patient'.
hydrologist