"Agreed, promote the use of the populationCriteriaReference expression from gap-indv to indv, and provide documentation on usage from the Individual MeasureReport page: http://hl7.org/fhir/us/davinci-deqm/indv-reporting.html#constructing-an-individual-report Change the populationReference extension value from CodableConcept (with binding to MeasurePopulationType value set) to type of string, which will reference Measure.group.population.id in a Measure resource. Specifically document that a single resource contributing to more than one criteria may have multiple criteria reference extensions: Note that as many extension-populationReference elements can be added to a single resource as necessary. For example, if a single resource contributes to both the "initial population" and the "denominator", you can repeat the extension-populationReference. One repeat would have a "value" of Measure.group.population.id for the initial population and the second repeat a "value" of Measure.group.population.id for the denominator Also add a reference in the following section of the profile to the individual measure report profile: Add bullet to http://build.fhir.org/ig/HL7/davinci-deqm/StructureDefinition-indv-measurereport-deqm.html#mandatory-data-elements-and-terminology