Can. 998 - The anointing of the sick by which the Church commends to the suffering and glorified Lord the faithful who are dangerously sick so that He relieve them and save them, is conferred by anointing them with oil and using the words prescribed in the liturgical books.

Can. 1000 - §1. The anointings are to be carefully performed while observing the words, the order and the manner prescribed in the liturgical books; but in case of necessity it is sufficient that one anointing be made on the forehead, or even on another part of the body, while saying the entire formula.
§2. The minister is to perform the anointing with his own hand unless a serious reason persuades him to use an instrument.

Can. 1003 - §1. Every priest, and only a priest, validly administers the anointing of the sick.

Can. 1004 - §1. The anointing of the sick can be administered to a member of the faithful who, after having reached the use of reason, begins to be in danger due to sickness or old age.
§2. This sacrament can be repeated whenever the sick person again falls into a serios sickness after convalescence or whenever a more serious crisis develops during the same sickness.

Can. 1006 -  This sacrament is to be conferred upon sick persons who requested it at least implicitly when they were in control of their faculties.

Can. 1007 - The anointing of the sick is not to be conferred upon those who obstinately persist in manifest serious sin.