Our general surgeon has been doing on call coverage for other surgeons not in our practice group. For example, patient has surgery on 8/9 and our general surgeon does post op call coverage 8/13-8/19 and the primary surgeon assumes care on 8/20 until the patient is discharged. Since the two surgeons are not in the same practice and not billed under the same tax ID number, can we bill the post op call coverage for our surgeon as subsequent inpatient care?