This code system http://hl7.org/fhir/audit-event-action defines the following codes:

CodeDisplayDefinition
CCreateCreate a new database object, such as placing an order.
RRead/View/PrintDisplay or print data, such as a doctor census.
UUpdateUpdate data, such as revise patient information.
DDeleteDelete items, such as a doctor master file record.
EExecutePerform a system or application function such as log-on, program execution or use of an object's method, or perform a query/search operation.