This page is part of the US Quality Core Implementation Guide (v1.0.0-ballot: STU 1 Ballot 1) based on FHIR (HL7® FHIR® Standard) R4. No current official version has been published yet. For a full list of available versions, see the Directory of published versions

Relationship with US Core and QI-Core

Page standards status: Informative

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US Core and QI-Core

US Quality Core implements USCDI+ Quality requirements in FHIR. Content in US Quality Core is derived from QI-Core and align to US Core. The following table shows the relationship between USCDI+ Quality and US Quality Core versions, as well as the corresponding US Core and QI-Core versions:

USCDI+ Quality Version	US Quality Core IG Version	US Core Version	QI-Core Version
V2	1.0.0-ballot	9.0.0	8.0.0-ballot
V1	0.5.0 (published via FHIR foundation)	6.1.0	6.0.0

The profiles defined in US Quality Core are derived from US Core profiles whenever possible. As a result, conforming to US Core automatically satisfies a significant subset of the conformance requirements of US Quality Core. US Quality Core conformance involves supporting certain additional data elements not required by US Core, because they are needed for quality measurement and reporting.

Because US Quality Core profiles derive from US Core profiles where possible, wherever US Core defines a binding, the US Quality Core profiles inherit that binding. US Quality Core may specify additional constraints, such as requiring a binding that is only preferred in the US Core base profile, but in general, the US Quality Core profiles use the same bindings as US Core.

Search Expectations and US Core

The US Quality Core CapabilityStatements identify the RESTful API capabilities specifically needed for USCDI+ Quality data. They do not repeat every US Core search expectation. For the search selection approach and conformance details, see API Requirements.