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["Patient Characteristic, Birthdate": "Birth date"]

Performance/Reporting Period
Direct Reference Code

Constrained to 'Birth date' LOINC code

QDM Datatype and Definition (QDM Version 5.5 Guidance Update)

"Patient Characteristic, Birthdate"

The "Patient Characteristic Birthdate" should document the patient’s date of birth.

Timing: The "Patient Characteristic, Birthdate" is a single point in time representing the date and time of birth. It does not have a start and stop time.

Note: "Patient Characteristic Birthdate" is fixed to LOINC code 21112-8 (Birth date) and therefore cannot be further qualified with a value set.

QDM Attributes


The date and time that the patient was born.


The identifier of a specific instance of any QDM data element. CQL logic uses the id reference to specify that a query expects a specific instance of an element to be retrieved.
Last Updated: Jul 08, 2021