Need to pass just a portion of an identifier

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Background
In our FHIR implementation, the Encounter ID is a sequence of three period delimited fields following this pattern: integer.integer.alphanumericString

Need
We have a need to pass JUST the alphanumeric portion in the FHIR payload for our own internal use.

Solutions
In my opinion, this sounds like a job for a proprietary extension, but maybe we could swing it as a secondary identifier with a special URI…? Any thoughts? Thanks for reading!

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In other contexts, the requirement has been handled using this extension: http://build.fhir.org/extension-rendered-value.html - ‘this is the part of the identifier suitable to show to a human’. You’re not clear on whether that is your use case.

As for a secondary identifier: that depends on whether the alphanumeric portion is properly unique. Typically, it would not be so, and so it could not be treated as an identifier safely

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