If a physician does the stress test on 12/3/09 and another physician of ours supervised and then does the Myoview on 12/4/09, do I bill them all under the date the test begins or bill seperate dates?

Dr. A 78465-26 on 12/4/09
93018 on 12/3/09

Dr. B 93016 on 12/3/09

Thank you.