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Canon 915: Those who have been excommunicated or interdicted after the imposition or the declaration of a penalty as well as others who obstinately persist in manifest grave sin are not to be admitted to communion.

Can. 916 A person who is conscious of grave 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.- http://www.vatican.va/archive/ENG1104/_P39.HTM

But as i understand it, the decision to excommunicated is left to the local ordinary, though he can be overruled. See more on this issue here. http://www.freerepublic.com/focus/religion/2901874/posts?page=68#68

And then you have the interpretation of men like the aforementioned Wuerl

" . "I stand with the great majority of American bishops and bishops around the world in saying this canon [Canon 915] was never intended to be used this way.'' -- http://www.canonlaw.info/2009/03/abps-wuerl-c-916-burke-cc-915-916-on.html

Also, according to Canon 1184 §, unless they gave some signs of repentance before death, the following must be deprived of ecclesiastical funerals: 1/ notorious apostates, heretics, and schismatics; 2/ those who chose the cremation of their bodies for reasons contrary to Christian faith; 3/ other manifest sinners who cannot be granted ecclesiastical funerals without public scandal of the faithful. (http://www.vatican.va/archive/ENG1104/_P4X.HTM; http://www.ewtn.com/library/liturgy/zlitur280.htm)

Yet the overall practice of Rome is to treat liberal RCs as member in life and in death, and thus souls as Teddy Kennedy to Hugo Chavez have been granted ecclesiastical funerals, perhaps because they no longer result in much public scandal of the faithful.

However Scripture commands concerning such reproved but impenitent professed members,

"But now I have written unto you not to keep company, if any man that is called a brother be a fornicator, or covetous, or an idolater, or a railer, or a drunkard, or an extortioner; with such an one no not to eat. For what have I to do to judge them also that are without? do not ye judge them that are within? But them that are without God judgeth. Therefore put away from among yourselves that wicked person. " (1 Corinthians 5:11-13)

"Now I beseech you, brethren, mark them which cause divisions and offences contrary to the doctrine which ye have learned; and avoid them. " (Romans 16:17)

"And if any man obey not our word by this epistle, note that man, and have no company with him, that he may be ashamed. " (2 Thessalonians 3:14)