Critical Care is the direct care by the physician or MLP for a patient with a high probability of imminent or life threatening deterioration in their condition. The physician makes complex decisions to assess, manipulate and support vital system function to treat organ system failure and/or to prevent further life threatening deterioration. Medicare states that in order to qualify as critical care, “the failure to initiate these interventions on an urgent basis would likely result in sudden, clinically significant or life threatening deterioration in the patient’s condition”.