I was able to find this on cms website:
The psycholoist is expected to bill for the work he/she performed on that date of service. If all of the testing is conducted by a psychologist, then the professional code should be billed for the time spent on test administration, interpretation and report preparation, as well as integration of previously interpreted test results into a comprehensive report ( 96101)
Only the appropriate technician administered or computer administerd codes can be billed on the actual date of service if a psychologist interprets and writes a report on individual tests administered by a technician (96102) or computer (96103). The interpretation and reporting of the individual test results by the psychologist which may sometimes occur on a different date than the testing date are already captured in the payment for the technician and computer-administered codes.
I also found this with bc and magellan etc. Is the interpretation that since he does the report on a different day for 96101, that it can be billed as date of report?