Chemotherapy infusion done in a facility setting

Does anybody know if a physician is in private practice and sends his patients to the hospital for infusion/chemotherapy services, does the provider have to be present at all times for the infusion/chemo services to be billable by the hospital, or can the ordering physician be 'present' in the bulding, ie, seeing other patients in the same building?

I think

there are no rules at all about that- the physician does not have to be anywhere near the facility; the facility just needs a valid order for the infusion. I order Reclast, blood, antibiotics without being there.

Incident-to Medicare

Under the applicable Medicare regulations, services performed by auxiliary personnel “incident to” a physician’s services must be under the “direct supervision” of the physician (or other practitioner). The regulations expressly provide, however, that the “physician directly supervising the auxiliary personnel need not be the same physician (or other practitioner) upon whose professional service the incident to service is based.” Thus, if the chemotherapy was administered by oncology nurses “incident to” the professional services of the Clinic’s oncologist, “direct supervision’ is defined by the regulations to mean: “a physician is present in the office suite and immediately available to furnish assistance and direction throughout the performance of the procedure.” If assistance is not needed, the supervising physician would never see the patient.