English Translation
You get on the phone and call the doctor.
Warum nicht “rufen den Arzt an”?
You get on the phone and call the doctor.
Warum nicht “rufen den Arzt an”?
anrufen means to call. here, rufen refers to herbeirufen, send for the doctor / call for the doctor.
… which is, rereading the English phrase, not said there, still, from the context and imperative of the first part, I would not expect that the order is to just make some call.