Can anyone help me with how to code for observation care when the patient was admitted to the ER at 8:30 pm, then the admission status was changed to Observation at 2:15 am the next calendar day and the patient was discharged at 10:30 pm on the same day that the patient was admitted to Observation care. My provider is billing for same day admit/discharge. I'm not sure if this should be initial observation care or same day admit/discharge observation care. Does the same day admit/discharge time start when the patient is admitted to the E/R or when their admitted to observation care?