Cooking with CQL Q&A Index Using Quality Data Model Category

Using Quality Data Model Q&A from Cooking with CQL Sessions

Diagnoses vs Diagnosis: With the new changes to the QDM, is the attribute now “Diagnoses” instead of “Diagnosis”? (Session 17 - 8/17/17)

Yes. This change was made to support the fact that a single encounter may have multiple diagnoses associated with it. Note that the “Principal Diagnosis” attribute is still singular.

Expand Operator: In the Quality Data Model (QDM) 5.5, what does the expand operator do? Can it be used to make a list of each day in the measurement period? (Session 43 - 4/23/20)

Yes. QDM 5.5 does not have an expand operator, QDM is the data model. The CQL expand operator is an operator that takes a list of intervals and returns the unit intervals in that input. As shown in Example 1, if you expand the interval from 1 to 10, the result would be a list of the intervals from 1 to 1, 2 to 2, and so on.

Example 1

expand { Interval[1, 10]} // { Interval[1, 1], Interval[2, 2] ...}

There is also a per clause, shown in Example 2. If you expand the measurement period, you can get intervals of milliseconds by saying per day then you get intervals of days. If you said per month, you would get 12 months and then you could count the encounters in that month.

Example 2


define "Measurement Period Days":

	  expand { "Measurement Period" } per day

Measurement Period is a calendar calculation. If you are using Measurement Period Days and the measurement period includes a leap year, that will be accounted for in the calculation. Similarly, if you said month, you will get the calendar month intervals. You could also ask for the months, the counts in the days, and the highest count of days in that month.

“id” uses in QDM v5.3: Which are the other uses for “id” in QDM v5.3? (Session 17 - 8/17/17)

When using observations with different dates
For an episode of care
When using the same encounter from two different expressions.

Using Quality Data Model Questions from Cooking with CQL Sessions

Category	Question	Session # and Date
Using Quality Data Model (QDM)	In QDM 5.5, we have reduced ability to talk about entity types and these are attributes that are patients, persons, or practitioners. In the examples we"ve used to illustrate these is using the "is" operator in CQL by saying participant is an organization. However, there is an issue with Bonnie that it doesn"t support the "is" operator, but it does support the "as" operator. How do we work around this issue?	40 - 12/5/19
Using Quality Data Model (QDM)	QDMs are not really used for interoperability like FHIR is, it defines the type of metadata that we call attributes. Is it true that EHRs have been implemented to be able to export the full QDM set of attributes every time you ask for something? That"s the ideal.	35 - 5/23/19
Using Quality Data Model (QDM)	Does the new Related Person QDM datatype allow an eCQM specification to reference information about a related person that is already present in the patient"s record? As an example, instead of a direct context query, maternal information may be shared in a C-CDA and incorporated into an infant"s record.	33 - 3/28/19
Using Quality Data Model (QDM)	Is the type of coverage, e.g., commercial, Medicare, Medicaid considered in the QDM participation logic?	32 - 2/28/19
Using Quality Data Model (QDM)	Is it accurate that if the glucocorticoid dosage expression was used for dispensed to ordered, results would be different because all the attributes are not available?	31 - 1/31/19