POS when Client is Inpatient but Family w/o Client billed?

Does anyone know what POS I would use to bill a 90846 (family session w/o patient) when the patient herself is in an inpatient facility? 

The parents met with our provider to discuss plans for when the patient is discharged.   I billed it out as we normally would under POS 11, but BCBS denied saying we needed to use an inpatient POS, but we are an outpatient only clinic. 

Thanks