The physician saw patient in consulation for food allergy. Please note, the physician has never seen this patient before. At the time of the encounter, the patient had no signs of allergic reaction. However, the reason for the consultation was because the patient would develop a rash after drinking milk or eating eggs. My physician did not treat the patient or perform any allergy testing. But, she did state to avoid these certain food. What diagnosis do I code for this encounter since the patient technically does not have a symptom at time of this encounter?