Level System Code Display (en) Definition JSON XML 1http://terminology.hl7.org/CodeSystem/data-absent-reason unknown Unknown The value is expected to exist but is not known. 2http://terminology.hl7.org/CodeSystem/data-absent-reason asked-unknown Asked But Unknown The source was asked but does not know the value. 2http://terminology.hl7.org/CodeSystem/data-absent-reason temp-unknown Temporarily Unknown There is reason to expect (from the workflow) that the value may become known. 2http://terminology.hl7.org/CodeSystem/data-absent-reason not-asked Not Asked The workflow didn't lead to this value being known. 2http://terminology.hl7.org/CodeSystem/data-absent-reason asked-declined Asked But Declined The source was asked but declined to answer. 1http://terminology.hl7.org/CodeSystem/data-absent-reason masked Masked The information is not available due to security, privacy or related reasons. 1http://terminology.hl7.org/CodeSystem/data-absent-reason not-applicable Not Applicable There is no proper value for this element (e.g. last menstrual period for a male). 1http://terminology.hl7.org/CodeSystem/data-absent-reason unsupported Unsupported The source system wasn't capable of supporting this element. 1http://terminology.hl7.org/CodeSystem/data-absent-reason as-text As Text The content of the data is represented in the resource narrative. 1http://terminology.hl7.org/CodeSystem/data-absent-reason error Error Some system or workflow process error means that the information is not available. 2http://terminology.hl7.org/CodeSystem/data-absent-reason not-a-number Not a Number (NaN) The numeric value is undefined or unrepresentable due to a floating point processing error. 2http://terminology.hl7.org/CodeSystem/data-absent-reason negative-infinity Negative Infinity (NINF) The numeric value is excessively low and unrepresentable due to a floating point processing error. 2http://terminology.hl7.org/CodeSystem/data-absent-reason positive-infinity Positive Infinity (PINF) The numeric value is excessively high and unrepresentable due to a floating point processing error. 1http://terminology.hl7.org/CodeSystem/data-absent-reason not-performed Not Performed The value is not available because the observation procedure (test, etc.) was not performed. 1http://terminology.hl7.org/CodeSystem/data-absent-reason not-permitted Not Permitted The value is not permitted in this context (e.g. due to profiles, or the base data types).