[Inziladun]

This might be getting a bit afield of the original topic, but Orcs don't seem to have any sense of loyalty beyond their local commander and their ultimate leader, be it Sauron or Saruman (or the Balrog!), They certainly seem to owe that sense to fear primarily, so it would take a strong alpha-Orc like the Great Goblin or Azog to order healing procedures. At any rate, it's difficult to picture Orcs stopping in the middle of a battle to rescue wounded comrades, though afterward if any were still alive and looked to be viable fighting specimens in the future, I think they would do what they could to heal them.