I didn't realize only Catholics can receive the sacrament.
Only Catholics that are in communion with the Church can receive ANY Sacrament....i.e. not in mortal sin....EXCEPT Confession and the Sacrament of Penance.
My Missal mentions only four groups allowed to receive Communion: Catholics (of course), The Orthodox, The Polish National Catholic Church, and the Assyrian Church of the East. Now whether they let their members receive our Eucharist, that is another matter.