we just wired up a one story medical building. we ran romex for the offices, kitchen, reception, and waiting rooms; and BX for the examination rooms...if there wern't any examination rooms, i am positive my boss would have ran all romex(speed/cost of running the wire, ect.)if it's not over 3 stories then go for it...just don't run it in open runs above a drop ceiling.
for a complete list of where you are allowed to use NM cable, look at
Article 334.10--Uses Permitted.
for complete list of where you can't use it look at Article 334.12--Uses Not Permitted
