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You asked this from FHIR Mapper · Lesson 16 · while mapping · PID-3
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What is identifier.system, and why is my PID-3 mapping warning about it?
Vaidyagrounded in 3 Kosha entries · synthetic AI answer
An identifierin FHIR is more than a number — it's a number plus the namespace that issued it. That namespace is identifier.system, written as a URI.2
Your HL7 message carries both in PID-3: the ID MRN-1042 and its assigning authority SIDHI (component 4). You mapped the value, but not the authority — so the mapper warns that identifier.system is empty.1
"identifier": [{
"system": "https://healthatoms.com/mrn", // ← the authority, as a URI
"value": "MRN-1042"
}]
Bind the authority to a registered URI and the warning clears — now the same MRN can't be confused with one from another hospital.3
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How do I bind an assigning authority to a URI?Show the full Identifier resourceWhat's the difference between value and system?