The Catholic Church does not practise or recognise open communion.Code of Canon Law, canon 842 §1 and Code of Canons of the Eastern Churches, canon 675 §2 In general it permits access to its Eucharistic communion only to baptized Catholics.Code of Canon Law, canon 844 §1 and Code of Canons of the Eastern Churches, canon 671 §1 Catholics can only receive Holy Communion if they are in a state of grace, this is without any mortal sin: "A person who is conscious of grave sin (mortal sin) is not to celebrate Mass or receive the body of the Lord without previous sacramental confession unless there is a grave reason and there is no opportunity to confess; in this case the person is to remember the obligation to make an act of perfect contrition which includes the resolution of confessing as soon as possible."Code of Canon Law, canon 916
