QUICK Data Model

The QUICK data model provides a logical view of clinical data from the persepctive of representing quality measurement and decision support knowledge.

Relationship to FHIR and QI-Core

The QUICK data model uses the QI-Core profiles to provide a physical representation for the data. QUICK provides a logical model that enables knowledge authors to ignore certain details of the FHIR Physical representation, including:

• The representation of primitives in FHIR using a "value" element of a complex type, rather than a true primitive
• The representation of extensions in FHIR as first class elements in QUICK
• Direct reference of resources, rather than needing to traverse a "reference"

To address the first issue, the QUICK model maps the FHIR base types to CQL primitives, rather than using the FHIR types directly:

FHIR Type	CQL Type
base64Binary	String
boolean	Boolean
code	String
CodeableConcept	Concept
Coding	Code
date	DateTime
dateTime	DateTime
decimal	Decimal
id	String
instant	DateTime
integer	Integer
markdown	String
oid	String
Period	Interval<DateTime>
positiveInt	Integer
Range	Interval<Quantity>
string	String
time	Time
uri	String

To address the second issue, the QUICK model represents FHIR extensions as first-class attributes of the class. To address the third issue, the QUICK model represents FHIR references as direct appearances of the referenced class or classes. NOTE: The third issue is still being worked out, so current QUICK documentation still uses the Reference type to model references.