It is very hard to actually put in a medic as a npc, but there is one way, although it only works sometimes, but anyway, heres the closest thing possible you can get:

1: Find a rebel medic ragdoll with NPC Animations you'd like to use.
2: Set the npc to "npc_citizen"
3: If you haven't already, check the box that says "Override Spawn Flags"
4: Type the number "131072" in the Spawn Flag bar.
5: Hope for the best.


And like I said, this may or may not work, but it's the closest you can get to actually getting a medic.