Your HL7 interface can now handle both Patient Update (ADT^A04) and Patient Discharge (ADT^A03) messages. In this step, you will modify your interface to handle Patient Merge (ADT^A18) messages.

	A Patient Merge message is created when duplicate patient records exist that need to be combined into a single message.

To do this, you will need to:

• Add a new message definition to your VMD mapping file;
• Add a new table to the VMD file;
• Re-export the tables from Iguana to ensure that your database is ready to receive the new information.