1. If the ER doc admitted the patient, then the Hospitalist saw them, you'll bill an Initial Inpatient code for both of them, and add an AI modifier to the ER doc's charge.
2. If they saw the ER doc in the ER only, and the Hospitalist did the admit, bill an Emergency Department E/M for the ER doc, and an Initial Inpatient for the Hospitalist, with the AI modifier.
So basically, you'll only bill an ER code, if the ER doctor saw the patient, and didn't admit them. Otherwise, you'll code the most intensive site of E/M service (Inpatient)...I attached a chart that you might find useful, in the future. Hope that helps!
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