Chuk,
I use medisoft and AC - we did not purchase the interface as it is expensive, when something changes it requires updates, etc. I assume (don't get mad if I am wrong) that you work as an IMP style practice with just you and relatively low volume - if that is the case I would suggest double entry into medisoft to bill, this allows you to verify everything and make sure it is right. I see about 25-35 per day and do hospital and we double enter as I just do paper superbill to my billing person - it really does not require much more work and saves a lot of money.
