According to Madhhab:
Is it permissible to assist and visit one’s non-Muslim neighbour when he is ill? Can one make Dua for his well being and good health?
Doing so indicates towards the lofty character of a person when a person doesn’t have any worldly motive behind such a visit. One may make Dua for the health of the neighbour that Allah Ta'ala grants him Hidaayat.
Re:- Fataawa Mahmoodiyya pg.191 vol.28