Abortion - Excommunication
NOTE WELL To actually incur the excommunication one must know that it is an excommunicable offense at the time of the abortion. Canon 1323 provides that the following do not incur a sanction, those who are not yet 16, are unaware of a law, do not advert to it or are in error about its scope, were forced or had an unforeseeable accident, acted out of grave fear, or who lacked the use of reason (except culpably, as by drunkenness). Thus a woman forced by an abusive husband to have an abortion would not incur an excommunication, for instance, whereas someone culpably under the influence of drugs or alcohol would (canon 1325).
In any case, whether one has been excommunicated or not, the sin of abortion must be confessed as the taking of innocent human life (5th Commandment). If the penitent did not know about this law at the time of the abortion then he or she was NOT excommunicated. If the person knew about the law but there were extenuating circumstances (such as mentioned above concerning c. 1323) then these factors should be mentioned to the confessor.
He will say whether he has the faculty from the bishop to absolve from this excommunication or whether he even needs to. If he does not, he will privately and secretly obtain absolution from the bishop or send the person to a confessor who has that power.
A person who believes they have been excommunicated must refrain from Holy Communion until both absolution for the sin and absolution for the excommunication has been given.