Speaking from an Allscripts PM perspective I think it is a technical limitation in that there is not a trigger event built into the application for ICD9 codes like there is for procedure codes. The trigger events are what allow data to be exported from Allscripts PM through AIE. I'm not sure the underlying reason why they never developed this trigger event. We always updated our PM system and then updated EHR based on what we had just updated in PM so it seems logical to me to have this trigger event. See screenshot for available trigger events.
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