Enabling a combat medic style could be pretty cool. Balance on the ability could be a little tricky. Easiest way would be to limit the ability to once a day per ally similar to the healer feat. IMOField Medicine - Expend 1 SD and make a DC10 Wisdom (Medicine) check on a successful check you heal a creature within 5ft of you 1d6 + SD damage.
I know some people do not like martial healing but to be honest I do not care. My main issue is how this should scale, should it allow the expenditure of multiple dice on the one use?