This page is part of the FHIR Specification (v3.2.0: R4 Ballot 1). The current version which supercedes this version is 5.0.0.  For a full list of available versions, see the Directory of published versions  . Page versions: R5 R4B R4 R3 R2
. Page versions: R5 R4B R4 R3 R2
| FHIR Infrastructure  Work Group | Maturity Level: 0 | Informative | Use Context: Any | 
This is a value set defined by the FHIR project.
Summary
| Defining URL: | http://hl7.org/fhir/ValueSet/data-absent-reason | 
| Name: | DataAbsentReason | 
| Definition: | Used to specify why the normally expected content of the data element is missing. | 
| Committee: | FHIR Infrastructure  Work Group | 
| OID: | 2.16.840.1.113883.4.642.3.5 (for OID based terminology systems) | 
| Source Resource | XML / JSON | 
This value set is used in the following places:
This value set includes codes from the following code systems:
http://hl7.org/fhir/data-absent-reason
This expansion generated 20 Dec 2017
This value set contains 10 concepts
Expansion based on http://hl7.org/fhir/data-absent-reason version 3.2.0
All codes from system http://hl7.org/fhir/data-absent-reason
| Lvl | Code | Display | Definition | 
| 0 | unknown | Unknown | The value is not known. | 
| 0 | asked | Asked | The source human does not know the value. | 
| 0 | temp | Temp | There is reason to expect (from the workflow) that the value may become known. | 
| 0 | not-asked | Not Asked | The workflow didn't lead to this value being known. | 
| 0 | masked | Masked | The information is not available due to security, privacy or related reasons. | 
| 0 | unsupported | Unsupported | The source system wasn't capable of supporting this element. | 
| 0 | astext | As Text | The content of the data is represented in the resource narrative. | 
| 0 | error | Error | Some system or workflow process error means that the information is not available. | 
| 1 | NaN | Not a Number | NaN, standing for not a number, is a numeric data type value representing an undefined or unrepresentable value. | 
| 0 | not-performed | Not Performed | The value is not available because the observation procedure (test, etc.) was not performed. | 
See the full registry of value sets defined as part of FHIR.
Explanation of the columns that may appear on this page:
| Lvl | A few code lists that FHIR defines are hierarchical - each code is assigned a level. For value sets, levels are mostly used to organise codes for user convenience, but may follow code system hierarchy - see Code System for further information | 
| Source | The source of the definition of the code (when the value set draws in codes defined elsewhere) | 
| Code | The code (used as the code in the resource instance). If the code is in italics, this indicates that the code is not selectable ('Abstract') | 
| Display | The display (used in the display element of a Coding). If there is no display, implementers should not simply display the code, but map the concept into their application | 
| Definition | An explanation of the meaning of the concept | 
| Comments | Additional notes about how to use the code |