FHIR Chat · validation: coding.system to be absolute reference

Stream: conformance

Topic: validation: coding.system to be absolute reference

Chao Shen (Jun 24 2021 at 00:09):

When using HAPI validator, for below extension, we got error "diagnostics": "Coding.system must be an absolute reference, not a local reference"

    {
      "url": "detailed",
      "valueCoding": {
        "system": "2.16.840.1.113883.6.238",
        "code": "2108-9",
        "display": "European"
      }

From FHIR https://www.hl7.org/fhir/datatypes.html#Coding, we do not see anywhere it mention the Coding.system must be an absolute reference.

Is there any FHIR spec requires this to be absolute reference (e.g. urn:oid:2.16.840.1.113883.6.238)?

Grahame Grieve (Jun 24 2021 at 00:15):

the definition is

The system is a URI that identifies the code system that defines the code

with explaining text that says:

The system ensures that codes can be unambiguously traced back to their original definition

a relative URI does not meet fulfill those statements.

Grahame Grieve (Jun 24 2021 at 00:16):

anyway, as I explained elsewhere, you should have

"system": "urd:oid:2.16.840.1.113883.6.238",

Chao Shen (Jun 24 2021 at 00:20):

Thanks for the explanation! This is very helpful!

Lloyd McKenzie (Jun 24 2021 at 01:25):

Small typo. I believe Grahame meant:
"system": "urn:oid:2.16.840.1.113883.6.238",

Last updated: Apr 12 2022 at 19:14 UTC

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