Limiting visits is most often advised when a patient is hospitalized and undergoing some kind of treatment. Family members are normally a nuisance in those situations.
I doubt if a private hospital is limiting visits and many patients would be very depressed if they dd not have visitors and "family members were considered a nuisance". I think it is Philip. he does not want to be seen when he is ill.. so he prefers to be on his own till he feels better...