FHIR Chat · cql & fhir extensions

Stream: cql

Topic: cql & fhir extensions

Jeffrey Taylor (Oct 23 2019 at 19:37):

Is there a way to specific a FHIR extension in a CQL query?

Here is an example:

library "test" version '1'

valueset "Some Condition VS": '1.2.3.4'

context Patient

define "Some Condition":
  exists([Condition: "Some Condition VS"])
  and exists // extension with url "http://test.com" & valueString "123"

The operator exists([Condition: "Some Condition VS"]) finds the patients that have a condition inside of the '1.2.3.4' valueset, but I want to further restrain the query by looking for a specific value on a fhir extension.

Bryn Rhodes (Oct 23 2019 at 22:45):

Yes, extensions are exposed in the FHIR model, so you can access them like any other element:

library "test" version '1'

valueset "Some Condition VS": '1.2.3.4'

context Patient

define "Some Condition":
  exists(
        [Condition: "Some Condition VS"] C
          where exists (
                C.extension E
                  where E.url = 'http://test.com'
                      and E.value = '123'
            )
    )

Mohammad Afaq Khan (Oct 24 2019 at 00:09):

(deleted)

Saoji Adhe (Oct 24 2019 at 11:26):

Hi ,
i want to test cqf-ruler-0.1.13-SNAPSHOT.jar with hapi-fhir-3.8 , to test $evaluate-measure
but it's not working with example given by hspc in there documentation
anybody know about where i will get example related to $evaluate-measure, $apply, cds-hooks etc...
Thank you in advance.

Jeffrey Taylor (Oct 24 2019 at 13:09):

Thanks @Bryn Rhodes, this clicked - appreciate you sharing this example.

Alexander Kiel (Oct 24 2019 at 14:05):

@Saoji Adhe I would be more than happy, if you gave Blaze a try. It supports $evaluate-measure, although with initial-population only were the CQL expression has to be called InInitialPopulation. Please also see this script which calls $evaluate-measure the way it's currently supported.

Eghonghon Okpah (Feb 13 2020 at 20:20):

@Bryn Rhodes Thanks you for sharing the fhir extension cql query structure
Please find below a code snap and test patient extension structure I am testing out
define ValidBasic:
exists(
[Basic] B
where exists (
B.extension HE
where HE.url = 'http://sample.com/fhir/StructureDefinition/isHospice'
and HE.value = true
)
)

"extension": [
{
"url": "http://sample.com/fhir-extensions/Basic-originalReasonEntitlementCode",
"valueCodeableConcept": {
"coding": [
{
"system": "CodeSystem",
"code": "11429006",
"display": "OREC"
}
]
}},
{
"url": "http://sample.com/fhir/StructureDefinition/isHospice",
"valueBoolean": "true"
}
],

My results evaluate to a false when I execute my test case, even though the URL and the value are both contained within the extension

Bryn Rhodes (Feb 14 2020 at 22:38):

Hi @Eghonghon Okpah , I can confirm this behavior in the cql-runner, but I think we have fixed this already in the latest version of the engine. Where are you seeing this behavior?

Eghonghon Okpah (Feb 19 2020 at 07:28):

@Bryn Rhodes we are using CQL Engine Version: 1.3.10-SNAPSHOT

Bryn Rhodes (Feb 19 2020 at 15:30):

So digging on this a bit more and it is a known issue that we are currently working on a fix for: https://github.com/DBCG/cql_engine/issues/262 and https://github.com/cqframework/clinical_quality_language/pull/482

Last updated: Apr 12 2022 at 19:14 UTC

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