This code system http://hl7.org/fhir/data-absent-reason defines the following codes:
|
Lvl
|
Code
|
Display
|
Definition
|
Comments
|
| 1 |
unknown
|
Unknown |
The value is not known. |
|
| 1 |
asked
|
Asked |
The source human does not know the value. |
|
| 1 |
temp
|
Temp |
There is reason to expect (from the workflow) that the value may become known. |
|
| 1 |
not-asked
|
Not Asked |
The workflow didn't lead to this value being known. |
|
| 1 |
masked
|
Masked |
The information is not available due to security, privacy or related reasons. |
Using "masked" may be breach of security or confidentiality, but there are times when its use is required to support alternate workflows for gaining access to denied information. |
| 1 |
unsupported
|
Unsupported |
The source system wasn't capable of supporting this element. |
|
| 1 |
astext
|
As Text |
The content of the data is represented in the resource narrative. |
it may be linked by internal references (e.g. xml:id). This usually implies that the value could not be represented in the correct format - this may be due to system limitations, or this particular data value |
| 1 |
error
|
Error |
Some system or workflow process error means that the information is not available. |
|
| 2 |
NaN
|
Not a Number |
NaN, standing for not a number, is a numeric data type value representing an undefined or unrepresentable value. |
This is sometimes an output value from measuring devices |
| 1 |
not-performed
|
Not Performed |
The value is not available because the observation procedure (test, etc.) was not performed. |
|