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| [[Category: PCD]]
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| [[Category: PCD Pages Needing Work]]
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| ===MSH-10 Message Control Id===
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| (original paragraph broken out into individual propositions)
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| # Definition:
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| 1. This field contains a number or other identifier that uniquely identifies the message.
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| 2. Each message should be given a unique identifier by the sending system.
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| 3. The receiving system shall echo this ID back to the sending system in the Message Acknowledgment segment (MSA).
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| 4. The combination of this identifier and the name of the sending application (MSH-3) shall be unique across the Healthcare Enterprise.
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| Implications:
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| Sending system must not repeat sequence after restart.
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| Any other information that should be encoded?
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| return to [[PCD TC 2011-03-09 Webex]]
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