Dooring is tough - in most cases, nothing happens except apologies. I ride out of the door zone as much as I can, even though Chicago's bike lanes ARE the door zone's. I hug the outer white line pretty tight and watch for drivers coming out of cars closely. Still in some cases's it'll be unavoidable. If the injury was bad enough, you could try seeing if trading insurance info is possible. Or at least get his.

Heal up fast, ride soon.