In my opinion, it's not really appropriate for a provider to be doing this, and likely may even be against the hospital's internal guidelines or could be taken by the attending MD as interference. During an inpatient stay, the patient is under the care of the attending physician and services of other providers are normally limited to just those that the attending or consulting physicians have specifically ordered or requested as part of their inpatient treatment plan. If a consultation has not been requested of your provider, then your provider cannot make any treatment decisions or changes to the patient's care plan, and given that the patient's condition may change, there really is no purpose for being there. They should probably reschedule the follow-up until after discharge when the patient's condition has been stabilized, so that the final outcome of the hospitalization can be evaluated and incorporated into the patient's continuing care plan at that time. All that said, though, this isn't really a question the provider should be asking of their coder as it is up to them to do what it necessary and correct for the patient, so if they do see the patient, then you should code and bill accordingly.