Just noticed my genie type colonist does not benifit from the psycast while laying in bed from a leg wound. Vanilla Skill "Preach Health" from a counselor increases "Injury healing factor" in the stats window of the pawn. Effectly decreasing the time he needs to heal.
Word of healing seems to do nothing. It does not decrease the time to heal and it is also not listed as an active effect under "injury healing factor".