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USPSTF_Statin_Use_for_Primary_Prevention_of_CVD_in_Adults_PatientFacing Change Log
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The following CQL downloads are currently available on CDS Connect.

- USPSTF_Statin_Use_for_Primary_Prevention_of_CVD_in_Adults_PatientFacing_FHIRv102_v1.0.0_CQL.zip
- USPSTF_Statin_Use_for_Primary_Prevention_of_CVD_in_Adults_PatientFacing_FHIRv401_v1.0.0_CQL.zip

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USPSTF_Statin_Use_for_Primary_Prevention_of_CVD_in_Adults_PatientFacing_FHIRv102 (FHIR DSTU2)
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VERSION 1.0.0
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Initial FHIR DSTU2 version.

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USPSTF_Statin_Use_for_Primary_Prevention_of_CVD_in_Adults_PatientFacing_FHIRv401 (FHIR R4)
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VERSION 1.0.0
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The USPSTF_Statin_Use_for_Primary_Prevention_of_CVD_in_Adults_PatientFacing_FHIRv401 version
1.0.0 library is a FHIR R4 port of
USPSTF_Statin_Use_for_Primary_Prevention_of_CVD_in_Adults_PatientFacing_FHIRv102 version
1.0.0. While the intent of the logic remains the same as the FHIR DSTU2-based version,
changes in the FHIR specification (from DSTU2 to R4) require additional changes in the CQL
logic. This R4 representation contains the following changes related to the movement from
FHIR DSTU2 to FHIR R4. NOTE: The following list encompasses changes in the primary CQL
library as well as the
USPSTF_Statin_Use_for_Primary_Prevention_of_CVD_in_Adults_Shared_Logic_FHIRv401 library.

- FHIR data model is now version 4.0.1
- FHIRHelpers is now version 4.0.1
- CDS_Connect_Commons_for_FHIRv102 has been replaced by CDS_Connect_Commons_for_FHIRv401
  version 1.0.0
- MedicationOrder is replaced by MedicationRequest
- Encounter.reason is replaced by Encounter.reasonCode

In addition to porting the data model, it also leverages new IGs and profiles, resulting in
the following additional changes from the DSTU2 version:
- Uses US Core v3.1.1 Smokingstatus profile and associated codes / value sets

The following additional changes were made based on new capabilities in later versions of the
CQL spec and tooling:
- URL-based value set identifiers are used rather than plain OIDs
- code/concept pairs are no longer needed; code definitions are sufficient, so concept
  definitions have been removed
- CQL retrieves now support codes, so ObservationsByConcept and ConditionsByConcept were
  replaced by simpler retrieves

USPSTF_Statin_Use_for_Primary_Prevention_of_CVD_in_Adults_PatientFacing_FHIRv401 version
1.0.0 has not been piloted in a clinical setting, but has undergone logic testing and
review.