Hi Mohamed,
I think this may vary geographically, I can speak only for Maryland and
Pennsylvania. I am a Family Physician, not admitting patients to the hospital. Hospitalists take care of our inpatients.
I have "Courtesy" or "Affiliated staff" privileges at one Md and 2 Pa hospitals. Typically the insurance companies require this, and an "agreement" with a participating physician to admit our patients. We identify a Hospitalist for this.
So my guess is that they would have to maintain some type of hospital priveleges, but not actually admit.
Hope this helps!
Gene