If they have a deductible plan and they haven't met it yet, then yes, I will send them a statement. Usually they're in the same boat we are and they pay their bill without a fuss. I've never had a physician expect to not have to pay their bill if they haven't met their deductible. Some physician's will send me the copay after the fact anyways since they know the deal with insurance.
Or we may send them a statement and adjust off everything BUT the copay. We try to be as accomodating and professional as possible to other providers.