User blog comment:EDN1980/Can Angels heal other angels.../@comment-108.16.120.27-20130518021435

It should be possible, it was shown in the episode Sacrifice that angels can since Metatron healed Castiel's vessel (Jimmy Novak) after cutting out the grace even though he was made human. . . again, Jimmy's body is still being possessed by Castiel and was healed from the slight cut to the throat.

Even though its also known that given enough time and if there isn't any foreign object ie. bullet made of melted down angel blade, the angel would be able to heal themselves from their injuries