Answer: Answer below.
Explanation:
It depends. Diagnoses are arrived through tests usually. The tests are ordered by whatever physician the person initiates treatment with (usually a primary care physician). Usually another physician will actually interpret the results of those tests. For biopsies, a pathologist can give a diagnosis by looking at tissue samples under the microscope. The patient never meets the pathologist. X-rays and CT Scans are read by a different type of doctor. If it's gynecology or cardiology-related (those are the two that come to mind) the actual ordering physician (especially in cardiology) will read the test and not another physician.
Once a diagnosis is made, the treatment is typically prescribed by the ordering physician, or a referral is made to another physician who specializes in that type of medicine.
Nurse Practitioners:
Coordinate patient care
Provide primary and specialty healthcare
Take and record patients’ medical histories and symptoms
Perform physical exams and observe patients
Create plans for patients’ care or contribute to existing plans
Perform and order diagnostic tests
Operate and monitor medical equipment
Diagnose various health problems