Question: Our ob-gyn saw a patient on 2/1/20 and then admitted her on 2/2/20. What code should I use for the 2/1/20 visit? The hospital has the admission date as 2/2/20. Missouri Subscriber Answer: If the patient was admitted to observation on 2/1/20, then you should bill one of those admission codes (99218-99220, Initial observation care, per day, for the evaluation and management of a patient …). On day two, the provider who admitted her to the hospital should bill the initial inpatient code (99251-99255, Inpatient consultation for a new or established patient …).