As far as I know, you should purchase them from an HL7 organization.
If you are a member, it is cheaper ($ 500), but for non-members it is quite expensive ($ 1,100).
Here is the HL7 database repository page .
If you have a BizTalk product and, in particular, an HL7 accelerator, it comes with the same data, but all this is contained in the XML documents / schemas. You could create a parser to read them and get the same data. Most likely, this would be straightforward, but it is possible.
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