Recommended

Discipline healing from level 10 to 90, chosen in the Discipline specialization. Target a friend to heal them: Power Word: Shield when they are low, before the pull and about every 12 seconds for Rapture; Flash Heal on Surge of Light; Penance; Flash Heal when they are very low; Binding Heal when you are both hurt; Prayer of Mending; Prayer of Healing and your tier-6 talent when three allies are hurt; Greater Heal; Renew while moving; Heal to top up. Under Spirit Shell it suggests Prayer of Healing or Greater Heal. Target an enemy to heal through Atonement: Penance, Power Word: Solace or Holy Fire, your tier-6 talent on packs, Shadow Word: Pain when solo, Smite. Reminders: Inner Fire, Fortitude, Archangel at five Evangelism, Inner Focus, Pain Suppression on a dying target, Shadowfiend or Mindbender for mana, Power Infusion, Desperate Prayer. Left to you: whom to heal, Spirit Shell timing (a reminder you can switch on), Power Word: Barrier, Void Shift and Grace stacks on the tank.

Adapted from Icy Veins: Discipline Priest rotation (MoP Classic), Icy Veins: Discipline Priest leveling (MoP Classic), Warcraft Tavern: Discipline Priest rotation (MoP Classic), wowtbc.gg: Discipline Priest (MoP Classic), Method: Discipline Priest guide (MoP Classic), Hekili (MoP fork): Discipline Priest priority.

In game: /rm set discipline chooses it by hand; it loads only for its edition and class, and is listed only for the specializations it is for.