Can someone please provide a link regarding the requirements to bill critical care? We have a provider who feels that if a patient comes in through Flight for Life as the patient was involved in a car accident with deployment of the airbag. Patient complains of facial pain and headache. The provider does all the critical care work up and the during the course of the physical exam he is neurotically normal and x-rays reveal no subarachnoid hemorrhage and patient's final diagnosis is headache. Does this constitute critical care?