How is the EDPS ICN assigned?

If an Encounter Data Record (EDR) is accepted, the 277CA will provide the Internal Control Number (ICN) assigned to that encounter. The ICN segment of the 277CA for the accepted encounter will be located in 2200D REF segment, REF01=IK and REF02=ICN. The ICN is a unique 13 - digit number. For more information please review the Encounter Data Submission and Processing Guide.