For several years I worked as a subcontractor to pre-authorize advanced radiology studies. Translation- If you needed a CT or MRI, your doctor would call and eventually talk to someone like me with clinical information to see if it was the right study, right time, etc. If the information was correct, I approved the study. If not, it was sent for review by a medical director. Generally, they stuck with my decision unless more information was received.
I did that job from home. Loved it. However, I left because insurance companies started changing criteria to deny as many studies as possible.
The thing to note is that this all occurred after the ACA passed and before Trump came along. The insurance companies were making record profits because the ACA was a federally mandated corporate welfare program. Notice that your premiums and deductibles never stopped rising under the ACA?
Now both parties are fighting against universal healthcare. I wrote a 3 part series on why universal healthcare is best and detail how this is true.