This case-sensitive code system http://hl7.org/fhir/us/davinci-deqm/CodeSystem/care-gap-reason defines the following codes:

Code	Display	Definition
NotFound	Data Element Not Found	Data Element was not able to be located
Missing	Missing Data Element	Data Element is known to exist (e.g. claim exists for procedure), but was not found
Present	Data Element is Present	Data Element is was found matching the criteria
InvalidAttribute	Attribute is Invalid	Data element was found, but value was not equal to expected value
DateInRange	Date is within specified range	Data element was a temporal type (e.g. DateTime, Period, Duration) was within range of dateFilter constraint
DateOutOfRange	Date is out of specified range	Data element was a temporal type (e.g. DateTime, Period, Duration) was not in range of dateFilter constraint
ValueInRange	Value is within specified range	Data element was a numeric type (e.g. Quantity, Integer, Range, Ratio, SampledData) was within in range of valueFilter constraint
ValueOutOfRange	Value is out of specified range	Data element was a numeric type (e.g. Quantity, Integer, Range, Ratio, SampledData) was not in range of valueFilter constraint
CountInRange	Count is within specified range	The count of data elements found was within specified range
CountOutOfRange	Count is out of specified range	The count of data elements found was out of specified range