Bruce Jenner, an Evangelical Protestant and self-identified transsexual
The Congregation for the Doctrine of Faith recently issued a statement regarding the question of transsexuals as godparents. To this the Congregation gave a negative. Rafael Zornoza, bishop of Cádiz and Ceuta defended the Congregation’s statement even to the extent of harsh criticism. The Congregation said the following.
“Regarding this particular [issue], I inform you of the impossibility that it be admitted. The transsexual behavior itself reveals, in a public manner, an attitude that is opposed to the moral demand of resolving one’s own problem of sexual identity according to the truth of one’s own sex. Therefore, it is evident that this person does not possess the requisite of leading a life according to the faith and to the position of godfather (CIC [Code of Canon Law] Can 874 §3), not being able, therefore, of being admitted to the position either of godmother or of godfather. Discrimination is not to be seen in this, but only a recognition of an objective lack of the requisites that by their own nature are necessary to take over the ecclesial responsibility of being a godparent.”
So the Vatican has made it clear that transsexuality is against Church doctrine on God creating man and woman and to say a man is actually a woman or vice versa is to contrary to “the order of creation”  as Pope Francis put it. Now the CDF has issued a statement saying explicitly transsexuals cannot be grandparents due to their lifestyle being “opposed to the moral demand of resolving one’s own problem of sexual identity according to the truth of one’s own sex.” This however does not necessarily mean they are excommunicated from the Church. I would refrain from saying transsexual Catholics are or are not excommunicated since I am not well enough acquainted with excommunication on this subject. Surely it is something a few people suffer with and they should be treated with compassion, but being a sickness it does make people be in the delusion they are of the opposite sex.
 Hendershott, Anne. Crisis Magazine: “Pope Francis Defends Human Gender Against Gender Radicals”. <http://www.crisismagazine.com/2015/freedom-creative-becomes-freedom-create-oneself>.
You can find the article here: http://rorate-caeli.blogspot.com/2015/09/important-vatican-congregation-for.html